Multiple IPs

[Fred]

Our server has 8 IPs with 121.232.21.1 as default (example).
I wrote a windows service that downloads podcasts (mp3s) off the net.
However every time this service runs it clogs down the entire server, even
though its not that bandwidth intensive. (30kps on a 100Mbps line)
Process resource at 20% max.
I would like to know if anyone knows what is causing this problem. What
command in c# can I use to assign the service a different IP to download ie
121.232.21.5 maybe that would help with the problem.

Fred

[Nicholas Paldino [.NET/C# MVP]]

Fred,

It sounds strange that you would have eight NIC cards with the same IP
address. That's certainly going to cause some problems. Why do you have so
many? Adding extra NIC cards is not going to give you any edge in
downloading from the web, as the bottleneck is the actual network pipe.

As for changing the service to use a different IP to download (and it
sounds like you aren't downloading, but rather, serving up the mp3s), that's
dependent on the service itself. It might not offer a command line way to
change whatever IP address it's using.

--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"Fred" <fr*******@yaho o.comwrote in message
news:%2******** ********@TK2MSF TNGP03.phx.gbl. ..

Our server has 8 IPs with 121.232.21.1 as default (example).
I wrote a windows service that downloads podcasts (mp3s) off the net.
However every time this service runs it clogs down the entire server, even
though its not that bandwidth intensive. (30kps on a 100Mbps line)
Process resource at 20% max.
I would like to know if anyone knows what is causing this problem. What
command in c# can I use to assign the service a different IP to download
ie 121.232.21.5 maybe that would help with the problem.

Fred

[Peter Duniho]

On Wed, 18 Jul 2007 22:17:38 -0700, Fred <fr*******@yaho o.comwrote:

Our server has 8 IPs with 121.232.21.1 as default (example).
I wrote a windows service that downloads podcasts (mp3s) off the net.
However every time this service runs it clogs down the entire server,
even though its not that bandwidth intensive. (30kps on a 100Mbps line)

Why do you think that the download is only 30kbps? Did you implement code
specifically to throttle your downloads?

If so, you should post the code that you think is not doing what you want
it to do. It's hard to answer the question without the code.

Of course, if you really have a 100Mbps Internet connection, one would not
expect a _single_ file download to saturate your bandwidth, since the
other end (the hosting server sending you the data) is highly unlikely to
be able to serve up the data that fast. But a) a 100Mbps Internet
connection is extremely unusual (so it seems unlikely that's what you
really have) and b) if you were to try to download many files at once,
that could in fact saturate even a 100Mbps connection.

Pete

[Fred]

sorry if i wasn't clear enough in the first post. the server has only 1 NIC
but has 8 ip addresses assigned to it.
actually it's not the service that uses the default ip it's everything. if i
use ie and go to a web page it uses 121.232.21.1.
How can I make my app aware of the multiple IPs and specify which one to
use?

As for changing the service to use a different IP to download (and it
sounds like you aren't downloading, but rather, serving up the mp3s),
that's dependent on the service itself. It might not offer a command line
way to change whatever IP address it's using.

I wrote the service myself so I have access to the source code. just need to
know the correct c# statement to use.

Fred

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c omwrote in
message news:%2******** ********@TK2MSF TNGP03.phx.gbl. ..

Fred,

It sounds strange that you would have eight NIC cards with the same IP
address. That's certainly going to cause some problems. Why do you have
so many? Adding extra NIC cards is not going to give you any edge in
downloading from the web, as the bottleneck is the actual network pipe.

>
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"Fred" <fr*******@yaho o.comwrote in message
news:%2******** ********@TK2MSF TNGP03.phx.gbl. ..

>Our server has 8 IPs with 121.232.21.1 as default (example).
I wrote a windows service that downloads podcasts (mp3s) off the net.
However every time this service runs it clogs down the entire server,
even though its not that bandwidth intensive. (30kps on a 100Mbps line)
Process resource at 20% max.
I would like to know if anyone knows what is causing this problem. What
command in c# can I use to assign the service a different IP to download
ie 121.232.21.5 maybe that would help with the problem.

Fred

[Fred]

no, thats the speed i get from the server that hosts the mp3s

the code uses TcpClient
TcpClient tcpClientC = new TcpClient ();

How can I tell it to use an ip of my choice?

[Peter Duniho]

I wish people would quote when they reply.

On Thu, 19 Jul 2007 14:58:37 -0700, Fred <fr*******@yaho o.comwrote:

no, thats the speed i get from the server that hosts the mp3s

What's the speed you get from the server that hosts the mp3s? The 30kpbs?

If the server hosting the mp3s is only passing you the data at 30kpbs,
you're not going to download the data any faster than that. I certainly
don't see how your own network could get saturated under those conditions,
unless your Internet connection is only a 30kbps connection (56K modem on
a noisy phone line).

the code uses TcpClient TcpClient tcpClientC = new TcpClient ();

How can I tell it to use an ip of my choice?

I also don't understand what you mean when you say that you've got a
single NIC, but 8 IP addresses. I've never heard of such a thing. How do
you get your one NIC configured for 8 different IP addresses?

Beyond that, why do you think that using different IP addresses is going
to help, if it's your network adapter that's saturated, even if it _is_
possible to have multiple IP addresses assigned to a single network
adapter?

If you have multiple network adapters, you can use the IP address assigned
to each adapter as the address to which a Socket or Tcp/UdpClient is
bound, which will affect how and whether inbound data gets sent to the
Socket or ...Client. However, you can't control how your outbound data is
sent, including connection requests. The network driver looks at the
destination address and selects what it thinks is an appropriate route.
(There are, of course, really low level ways to affect the routing, but
this isn't accessible by .NET I don't think).

Pete

[Mythran]

>the code uses TcpClient TcpClient tcpClientC = new TcpClient ();

How can I tell it to use an ip of my choice?

I also don't understand what you mean when you say that you've got a
single NIC, but 8 IP addresses. I've never heard of such a thing. How do
you get your one NIC configured for 8 different IP addresses?

Actually, this is quite common....my department has multiple ip addresses on
single NICS as well. :)

Mythran

[Peter Duniho]

On Fri, 20 Jul 2007 08:32:12 -0700, Mythran <ki********@hot mail.comwrote:

Actually, this is quite common....my department has multiple ip
addresses on single NICS as well. :)

Okay, so how do you do that?

I'm got a computer with a single NIC. How do I assign multiple IP
addresses to it?

In any case, the real point here is that it's the hardware that determines
the bandwidth, not the number of logical addresses assigned to the
hardware. Using a different IP address on the same hardware isn't going
to help throughput.

Pete

Getting a bit OT but, to get multiple IP's on a box, you need to add
multiple network cards.

"Peter Duniho" <Np*********@nn owslpianmk.comw rote in message
news:op******** *******@petes-computer.local. ..

On Fri, 20 Jul 2007 08:32:12 -0700, Mythran <ki********@hot mail.com>
wrote:

>Actually, this is quite common....my department has multiple ip
addresses on single NICS as well. :)

Okay, so how do you do that?

I'm got a computer with a single NIC. How do I assign multiple IP
addresses to it?

In any case, the real point here is that it's the hardware that determines
the bandwidth, not the number of logical addresses assigned to the
hardware. Using a different IP address on the same hardware isn't going
to help throughput.

Pete

[Peter Duniho]

On Fri, 20 Jul 2007 09:33:29 -0700, <Gedwrote:

Getting a bit OT but, to get multiple IP's on a box, you need to add
multiple network cards.

Two people have already claimed that's not true.

I am curious to hear how they accomplish it.