Greetings - I have a classic ASP site that is accessing custom written .NET
web services - we are looking at scalability options and though we have an
F5 load balancer that would definitley do the trick, I was wondering how DNS
load balancing was handled in such a situation?
That is DNS Resolves:
mywebservice.my domain.com: 10.10.10.10, 10.10.10.11, 10.10.10.12
I knwo most browsers will succesfully load balance this scenario, but it is
up to the 'client' making the request.
Any info would be appreciated.
Thanks!
5  2757 
You are looking at the network from the side of the servers, not the side of
the clients.
When you put in a NLB, you make one IP address visible. It is a Virtual IP.
The caller (in this case, your ASP site) cannot tell that there are three
machines under the covers. That machine (or farm?) need to use the DNS
entry assigned to the Virtual IP, not the contained IP addresses.
This is a bit confusing when you have all of the machines on a single LAN.
If it makes it less confusing, you can always configure a VLAN on your
switch to seperate the traffic from the ASP web server to your NLB, and keep
that apart from the traffic that flows from the NLB to your web application
servers.
--
--- Nick Malik [Microsoft]
MCSD, CFPS, Certified Scrummaster http://blogs.msdn.com/nickmalik
Disclaimer: Opinions expressed in this forum are my own, and not
representative of my employer.
I do not answer questions on behalf of my employer. I'm just a
programmer helping programmers.
--
"JP" <Jp******@gmail .com> wrote in message
news:uA******** ******@tk2msftn gp13.phx.gbl... Greetings - I have a classic ASP site that is accessing custom written
.NET web services - we are looking at scalability options and though we
have an F5 load balancer that would definitley do the trick, I was
wondering how DNS load balancing was handled in such a situation?
That is DNS Resolves:
mywebservice.my domain.com: 10.10.10.10, 10.10.10.11, 10.10.10.12
I knwo most browsers will succesfully load balance this scenario, but it
is up to the 'client' making the request.
Any info would be appreciated.
Thanks!
Right. I understand this method - and we have this segmented using VLAN's
w/ a LB machine inbetwen holding the single IP w/ several machines behind
it.
What I was wondering is using a different model, DNS load balancing, where
the decision comes from to decide which IP to pull. We use DJBDNS and this
information seemed to indicate the client made the decision. However, in
doing some ping tests on several machines it seems that it is actually
handing out sequential IPs. Just not fmailiar with what is going on behind
the scenes and wanted to make sure that when using ASP to pull a web service
via HTTP the behavior would be the same.
How to balance load among many web servers
These instructions assume that you are already running tinydns, version 1.04
or later, as a DNS server.
Suppose you have 50 identical www.heaven.af.mil web servers running on IP
addresses 1.2.3.150, 1.2.3.151, and so on. You can simply list all their
addresses in /service/tinydns/root/data:
+ www.heaven.af.mil:1.2.3.150
+ www.heaven.af.mil:1.2.3.151
+ www.heaven.af.mil:1.2.3.152
# etc.
When a DNS cache asks for the IP address of www.heaven.af.mil, tinydns will
automatically return a random set of 8 addresses.
If one of your web servers crashes, the effect on users will depend on how
their browsers behave:
a.. Silly behavior: I've heard rumors of obsolete browsers that give up
after a single IP address.
b.. Standard behavior: Most browsers move on to the next IP address after
the first connection attempt times out. A server outage produces a long
delay but not a failure.
c.. Smart behavior: To reduce the delay, smart browsers try each address
with a two-second timeout before retrying each address with a long timeout.
You can eliminate delays by removing IP addresses of web servers that have
crashed. tinydns is designed to work with external programs that monitor the
health of your servers. Specify each address with a 5-second TTL:
+ www.heaven.af.mil:1.2.3.150:5
+ www.heaven.af.mil:1.2.3.151:5
+ www.heaven.af.mil:1.2.3.152:5
An external program can remove an address by simply changing + to - on the
relevant line, then running make. Later, when that server has recovered, the
program can change - back to +.
"Nick Malik [Microsoft]" <ni*******@hotm ail.nospam.com> wrote in message
news:AL******** ************@co mcast.com... You are looking at the network from the side of the servers, not the side
of the clients.
When you put in a NLB, you make one IP address visible. It is a Virtual
IP. The caller (in this case, your ASP site) cannot tell that there are
three machines under the covers. That machine (or farm?) need to use the
DNS entry assigned to the Virtual IP, not the contained IP addresses.
This is a bit confusing when you have all of the machines on a single LAN.
If it makes it less confusing, you can always configure a VLAN on your
switch to seperate the traffic from the ASP web server to your NLB, and
keep that apart from the traffic that flows from the NLB to your web
application servers.
--
--- Nick Malik [Microsoft]
MCSD, CFPS, Certified Scrummaster
http://blogs.msdn.com/nickmalik
Disclaimer: Opinions expressed in this forum are my own, and not
representative of my employer.
I do not answer questions on behalf of my employer. I'm just a
programmer helping programmers.
--
"JP" <Jp******@gmail .com> wrote in message
news:uA******** ******@tk2msftn gp13.phx.gbl... Greetings - I have a classic ASP site that is accessing custom written
.NET web services - we are looking at scalability options and though we
have an F5 load balancer that would definitley do the trick, I was
wondering how DNS load balancing was handled in such a situation?
That is DNS Resolves:
mywebservice.my domain.com: 10.10.10.10, 10.10.10.11, 10.10.10.12
I knwo most browsers will succesfully load balance this scenario, but it
is up to the 'client' making the request.
Any info would be appreciated.
Thanks!
this won't work when connecting a server to a server in your network. This
is used to allow a DNS Cache to choose who to call. Certainly the DNS cache
for a client machine is managed by the client. For your server, though,
once a client server gets the IP address of the app server, it will keep
using it until the IP dies. This is very very bad. You defeat the purpose
of load balancing altogether.
F5 offers this as an option if you have to distribute a single web site to
servers around the world. DNS Cache servers at various ISPs can be
configured to return the "closest" IP address, so this allows the ISP to
present Amazon.uk to customers in England, and Amazon.com to customers in
the US. Unless you plan to multiply distribute your web service app servers
around the globe, and set up your client web servers under a variety of ISP
hosting sites, you probably shouldn't consider this option for use in a
server-to-server configuration.
--
--- Nick Malik [Microsoft]
MCSD, CFPS, Certified Scrummaster http://blogs.msdn.com/nickmalik
Disclaimer: Opinions expressed in this forum are my own, and not
representative of my employer.
I do not answer questions on behalf of my employer. I'm just a
programmer helping programmers.
--
"JP" <Jp******@gmail .com> wrote in message
news:eb******** ******@TK2MSFTN GP09.phx.gbl... Right. I understand this method - and we have this segmented using VLAN's
w/ a LB machine inbetwen holding the single IP w/ several machines behind
it.
What I was wondering is using a different model, DNS load balancing, where
the decision comes from to decide which IP to pull. We use DJBDNS and
this information seemed to indicate the client made the decision.
However, in doing some ping tests on several machines it seems that it is
actually handing out sequential IPs. Just not fmailiar with what is going
on behind the scenes and wanted to make sure that when using ASP to pull a
web service via HTTP the behavior would be the same.
How to balance load among many web servers
These instructions assume that you are already running tinydns, version
1.04 or later, as a DNS server.
Suppose you have 50 identical www.heaven.af.mil web servers running on IP
addresses 1.2.3.150, 1.2.3.151, and so on. You can simply list all their
addresses in /service/tinydns/root/data:
+www.heaven.af.mil:1.2.3.150
+www.heaven.af.mil:1.2.3.151
+www.heaven.af.mil:1.2.3.152
# etc.
When a DNS cache asks for the IP address of www.heaven.af.mil, tinydns
will automatically return a random set of 8 addresses.
If one of your web servers crashes, the effect on users will depend on how
their browsers behave:
a.. Silly behavior: I've heard rumors of obsolete browsers that give up
after a single IP address.
b.. Standard behavior: Most browsers move on to the next IP address after
the first connection attempt times out. A server outage produces a long
delay but not a failure.
c.. Smart behavior: To reduce the delay, smart browsers try each address
with a two-second timeout before retrying each address with a long
timeout.
You can eliminate delays by removing IP addresses of web servers that have
crashed. tinydns is designed to work with external programs that monitor
the health of your servers. Specify each address with a 5-second TTL:
+www.heaven.af.mil:1.2.3.150:5
+www.heaven.af.mil:1.2.3.151:5
+www.heaven.af.mil:1.2.3.152:5
An external program can remove an address by simply changing + to - on the
relevant line, then running make. Later, when that server has recovered,
the program can change - back to +.
"Nick Malik [Microsoft]" <ni*******@hotm ail.nospam.com> wrote in message
news:AL******** ************@co mcast.com... You are looking at the network from the side of the servers, not the side
of the clients.
When you put in a NLB, you make one IP address visible. It is a Virtual
IP. The caller (in this case, your ASP site) cannot tell that there are
three machines under the covers. That machine (or farm?) need to use the
DNS entry assigned to the Virtual IP, not the contained IP addresses.
This is a bit confusing when you have all of the machines on a single
LAN. If it makes it less confusing, you can always configure a VLAN on
your switch to seperate the traffic from the ASP web server to your NLB,
and keep that apart from the traffic that flows from the NLB to your web
application servers.
--
--- Nick Malik [Microsoft]
MCSD, CFPS, Certified Scrummaster
http://blogs.msdn.com/nickmalik
Disclaimer: Opinions expressed in this forum are my own, and not
representative of my employer.
I do not answer questions on behalf of my employer. I'm just a
programmer helping programmers.
--
"JP" <Jp******@gmail .com> wrote in message
news:uA******** ******@tk2msftn gp13.phx.gbl... Greetings - I have a classic ASP site that is accessing custom written
.NET web services - we are looking at scalability options and though we
have an F5 load balancer that would definitley do the trick, I was
wondering how DNS load balancing was handled in such a situation?
That is DNS Resolves:
mywebservice.my domain.com: 10.10.10.10, 10.10.10.11, 10.10.10.12
I knwo most browsers will succesfully load balance this scenario, but it
is up to the 'client' making the request.
Any info would be appreciated.
Thanks!
Ok - I understand your concern. That's interesting about the "closest" IP ,
wasn't aware of that.
One final question on this - what if this is just to load balance 2 servers
purely for redundancy purposes. That is, either server could easily handle
all the traffic. In this scenario, it seems like the DNS load blaancing in
a server to server model would be fine?
"Nick Malik [Microsoft]" <ni*******@hotm ail.nospam.com> wrote in message
news:15******** ************@co mcast.com... this won't work when connecting a server to a server in your network.
This is used to allow a DNS Cache to choose who to call. Certainly the
DNS cache for a client machine is managed by the client. For your server,
though, once a client server gets the IP address of the app server, it
will keep using it until the IP dies. This is very very bad. You defeat
the purpose of load balancing altogether.
F5 offers this as an option if you have to distribute a single web site to
servers around the world. DNS Cache servers at various ISPs can be
configured to return the "closest" IP address, so this allows the ISP to
present Amazon.uk to customers in England, and Amazon.com to customers in
the US. Unless you plan to multiply distribute your web service app
servers around the globe, and set up your client web servers under a
variety of ISP hosting sites, you probably shouldn't consider this option
for use in a server-to-server configuration.
--
--- Nick Malik [Microsoft]
MCSD, CFPS, Certified Scrummaster
http://blogs.msdn.com/nickmalik
Disclaimer: Opinions expressed in this forum are my own, and not
representative of my employer.
I do not answer questions on behalf of my employer. I'm just a
programmer helping programmers.
--
"JP" <Jp******@gmail .com> wrote in message
news:eb******** ******@TK2MSFTN GP09.phx.gbl... Right. I understand this method - and we have this segmented using
VLAN's w/ a LB machine inbetwen holding the single IP w/ several machines
behind it.
What I was wondering is using a different model, DNS load balancing,
where the decision comes from to decide which IP to pull. We use DJBDNS
and this information seemed to indicate the client made the decision.
However, in doing some ping tests on several machines it seems that it is
actually handing out sequential IPs. Just not fmailiar with what is
going on behind the scenes and wanted to make sure that when using ASP to
pull a web service via HTTP the behavior would be the same.
How to balance load among many web servers
These instructions assume that you are already running tinydns, version
1.04 or later, as a DNS server.
Suppose you have 50 identical www.heaven.af.mil web servers running on IP
addresses 1.2.3.150, 1.2.3.151, and so on. You can simply list all their
addresses in /service/tinydns/root/data:
+www.heaven.af.mil:1.2.3.150
+www.heaven.af.mil:1.2.3.151
+www.heaven.af.mil:1.2.3.152
# etc.
When a DNS cache asks for the IP address of www.heaven.af.mil, tinydns
will automatically return a random set of 8 addresses.
If one of your web servers crashes, the effect on users will depend on
how their browsers behave:
a.. Silly behavior: I've heard rumors of obsolete browsers that give up
after a single IP address.
b.. Standard behavior: Most browsers move on to the next IP address
after the first connection attempt times out. A server outage produces a
long delay but not a failure.
c.. Smart behavior: To reduce the delay, smart browsers try each address
with a two-second timeout before retrying each address with a long
timeout.
You can eliminate delays by removing IP addresses of web servers that
have crashed. tinydns is designed to work with external programs that
monitor the health of your servers. Specify each address with a 5-second
TTL:
+www.heaven.af.mil:1.2.3.150:5
+www.heaven.af.mil:1.2.3.151:5
+www.heaven.af.mil:1.2.3.152:5
An external program can remove an address by simply changing + to - on
the relevant line, then running make. Later, when that server has
recovered, the program can change - back to +.
"Nick Malik [Microsoft]" <ni*******@hotm ail.nospam.com> wrote in message
news:AL******** ************@co mcast.com... You are looking at the network from the side of the servers, not the
side of the clients.
When you put in a NLB, you make one IP address visible. It is a Virtual
IP. The caller (in this case, your ASP site) cannot tell that there are
three machines under the covers. That machine (or farm?) need to use
the DNS entry assigned to the Virtual IP, not the contained IP
addresses.
This is a bit confusing when you have all of the machines on a single
LAN. If it makes it less confusing, you can always configure a VLAN on
your switch to seperate the traffic from the ASP web server to your NLB,
and keep that apart from the traffic that flows from the NLB to your web
application servers.
--
--- Nick Malik [Microsoft]
MCSD, CFPS, Certified Scrummaster
http://blogs.msdn.com/nickmalik
Disclaimer: Opinions expressed in this forum are my own, and not
representative of my employer.
I do not answer questions on behalf of my employer. I'm just a
programmer helping programmers.
--
"JP" <Jp******@gmail .com> wrote in message
news:uA******** ******@tk2msftn gp13.phx.gbl...
Greetings - I have a classic ASP site that is accessing custom written
.NET web services - we are looking at scalability options and though we
have an F5 load balancer that would definitley do the trick, I was
wondering how DNS load balancing was handled in such a situation?
That is DNS Resolves:
mywebservice.my domain.com: 10.10.10.10, 10.10.10.11, 10.10.10.12
I knwo most browsers will succesfully load balance this scenario, but
it is up to the 'client' making the request.
Any info would be appreciated.
Thanks!
sure. So would any software load balancing scheme and you wouldn't need the
F5. Microsoft has a good software load balancing solution you may want to
consider.
--
--- Nick Malik [Microsoft]
MCSD, CFPS, Certified Scrummaster http://blogs.msdn.com/nickmalik
Disclaimer: Opinions expressed in this forum are my own, and not
representative of my employer.
I do not answer questions on behalf of my employer. I'm just a
programmer helping programmers.
--
"JP" <Jp******@gmail .com> wrote in message
news:en******** ******@TK2MSFTN GP09.phx.gbl... Ok - I understand your concern. That's interesting about the "closest" IP
, wasn't aware of that.
One final question on this - what if this is just to load balance 2
servers purely for redundancy purposes. That is, either server could
easily handle all the traffic. In this scenario, it seems like the DNS
load blaancing in a server to server model would be fine?
"Nick Malik [Microsoft]" <ni*******@hotm ail.nospam.com> wrote in message
news:15******** ************@co mcast.com... this won't work when connecting a server to a server in your network.
This is used to allow a DNS Cache to choose who to call. Certainly the
DNS cache for a client machine is managed by the client. For your
server, though, once a client server gets the IP address of the app
server, it will keep using it until the IP dies. This is very very bad.
You defeat the purpose of load balancing altogether.
F5 offers this as an option if you have to distribute a single web site
to servers around the world. DNS Cache servers at various ISPs can be
configured to return the "closest" IP address, so this allows the ISP to
present Amazon.uk to customers in England, and Amazon.com to customers in
the US. Unless you plan to multiply distribute your web service app
servers around the globe, and set up your client web servers under a
variety of ISP hosting sites, you probably shouldn't consider this option
for use in a server-to-server configuration.
--
--- Nick Malik [Microsoft]
MCSD, CFPS, Certified Scrummaster
http://blogs.msdn.com/nickmalik
Disclaimer: Opinions expressed in this forum are my own, and not
representative of my employer.
I do not answer questions on behalf of my employer. I'm just a
programmer helping programmers.
--
"JP" <Jp******@gmail .com> wrote in message
news:eb******** ******@TK2MSFTN GP09.phx.gbl... Right. I understand this method - and we have this segmented using
VLAN's w/ a LB machine inbetwen holding the single IP w/ several
machines behind it.
What I was wondering is using a different model, DNS load balancing,
where the decision comes from to decide which IP to pull. We use DJBDNS
and this information seemed to indicate the client made the decision.
However, in doing some ping tests on several machines it seems that it
is actually handing out sequential IPs. Just not fmailiar with what is
going on behind the scenes and wanted to make sure that when using ASP
to pull a web service via HTTP the behavior would be the same.
How to balance load among many web servers
These instructions assume that you are already running tinydns, version
1.04 or later, as a DNS server.
Suppose you have 50 identical www.heaven.af.mil web servers running on
IP addresses 1.2.3.150, 1.2.3.151, and so on. You can simply list all
their addresses in /service/tinydns/root/data:
+www.heaven.af.mil:1.2.3.150
+www.heaven.af.mil:1.2.3.151
+www.heaven.af.mil:1.2.3.152
# etc.
When a DNS cache asks for the IP address of www.heaven.af.mil, tinydns
will automatically return a random set of 8 addresses.
If one of your web servers crashes, the effect on users will depend on
how their browsers behave:
a.. Silly behavior: I've heard rumors of obsolete browsers that give up
after a single IP address.
b.. Standard behavior: Most browsers move on to the next IP address
after the first connection attempt times out. A server outage produces a
long delay but not a failure.
c.. Smart behavior: To reduce the delay, smart browsers try each
address with a two-second timeout before retrying each address with a
long timeout.
You can eliminate delays by removing IP addresses of web servers that
have crashed. tinydns is designed to work with external programs that
monitor the health of your servers. Specify each address with a 5-second
TTL:
+www.heaven.af.mil:1.2.3.150:5
+www.heaven.af.mil:1.2.3.151:5
+www.heaven.af.mil:1.2.3.152:5
An external program can remove an address by simply changing + to - on
the relevant line, then running make. Later, when that server has
recovered, the program can change - back to +.
"Nick Malik [Microsoft]" <ni*******@hotm ail.nospam.com> wrote in message
news:AL******** ************@co mcast.com...
You are looking at the network from the side of the servers, not the
side of the clients.
When you put in a NLB, you make one IP address visible. It is a
Virtual IP. The caller (in this case, your ASP site) cannot tell that
there are three machines under the covers. That machine (or farm?)
need to use the DNS entry assigned to the Virtual IP, not the contained
IP addresses.
This is a bit confusing when you have all of the machines on a single
LAN. If it makes it less confusing, you can always configure a VLAN on
your switch to seperate the traffic from the ASP web server to your
NLB, and keep that apart from the traffic that flows from the NLB to
your web application servers.
--
--- Nick Malik [Microsoft]
MCSD, CFPS, Certified Scrummaster
http://blogs.msdn.com/nickmalik
Disclaimer: Opinions expressed in this forum are my own, and not
representative of my employer.
I do not answer questions on behalf of my employer. I'm just a
programmer helping programmers.
--
"JP" <Jp******@gmail .com> wrote in message
news:uA******** ******@tk2msftn gp13.phx.gbl...
> Greetings - I have a classic ASP site that is accessing custom written
> .NET web services - we are looking at scalability options and though
> we have an F5 load balancer that would definitley do the trick, I was
> wondering how DNS load balancing was handled in such a situation?
>
> That is DNS Resolves:
>
> mywebservice.my domain.com: 10.10.10.10, 10.10.10.11, 10.10.10.12
>
> I knwo most browsers will succesfully load balance this scenario, but
> it is up to the 'client' making the request.
>
> Any info would be appreciated.
>
> Thanks!
>
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by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
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by: Hystou |
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Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
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by: tracyyun |
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Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
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by: adsilva |
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A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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