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Strange networking issue while posting larger messages

prometheuzz
197 Expert 100+
Hello all,

There's this problem I have, which I am unable to find a solution for. The problem is this: I cannot post messages with a specific size on (certain) forums. I hear you thinking: what has this to do with networking? Before I get burned to the stake, please hear me out.

I have recently plugged a wireless router on my (wireless) modem because my modem could only be configured as a DHCP server and was not able to forward any traffic to hosts that were not assigned an IP address from itself. Since I have a ftp/san- and print server (all small home devices) hooked up my network, it was more desirable to be able to give those servers a static IP address. So I configured my router as a DMZ host on my modem and connected all PC's and servers to my router.
Just for the sake of clarity, here's a drawing of how my network now looks like:



So far most works fine:
- both machines (PC and laptop) can print;
- both machines can connect to the SAN (Samba) drive from within the network and can make an ftp connection from the internet (which also works fine from other PC's outside my network, of course);
- both machines can approach each others shared drives/devices;
- I have a good connection to the Internet: my 20 mbit line gets an average of around 15 mbit.

In other words: everything works a-ok in the situation as in my ASCII drawing, except the posting of larger (+/- 70+ lines of text) messages on forums. If I try it, my browser(s) time out after a couple of seconds. The strange part is: I can post small messages without any problems. I suspect this has something to do with the router because when I hook my PC directly on the modem, I can post larger messages again (I posted this message like that). I get this (for me) strange behaviour on the forums here at thescripts.com (PHP driven) and also on Sun's Java forum (JSP driven).

What I have tried (all without result):
- posting with IE, Firefox an Safari on both the PC and laptop (Windows & Linux);
- upgrading the firmware of the router;
- defining my PC as DMZ host on the router;

This leads me to believe that there's something not going correct between the router and the modem. But due to my limited knowledge of networking, I am unable to know where, and how, to look for a solution.

I am not looking for people to hold my hand through the process of finding a solution, but I am more looking for things that might be going wrong: some keywords I can use a search engine on. Because right now, I haven't got the faintest idea where to look!
So, does anyone know what might be going wrong?

Thanks in advance!
Jul 19 '07 #1
4 1969
prometheuzz
197 Expert 100+
(Jos' reply from another thread)

I bet your modem is a router too, isn't it? If so, make your wireless router a
simple access point (some of these vague settings in its web interface) and turn
off dhcp in the modem/router. That's the way I do it with my ISP's 'life box' and
my wireless router.

kind regards,

Jos
Correct: the modem is a also router. But I can't turn off the DHCP server on that (worthless) thing, there is no such option: my ISP has removed most of those options from it.
But what puzzles me is that everything works OK except the posting of larges messages.

Regards,
Bart.
Jul 19 '07 #2
JosAH
11,448 Expert 8TB
(Jos' reply from another thread)



Correct: the modem is a also router. But I can't turn off the DHCP server on that (worthless) thing, there is no such option: my ISP has removed most of those options from it.
But what puzzles me is that everything works OK except the posting of larges messages.

Regards,
Bart.
Can you play with the lease time for the dhcp server? It looks like it's reassigning
ip addresses way too fast (just guessing). What if you download the firmware
again for that modem/router? can you turn off the dhcp server then?

kind regards,

Jos (not much of a networking man myself ;-)
Jul 19 '07 #3
prometheuzz
197 Expert 100+
Can you play with the lease time for the dhcp server? It looks like it's reassigning
ip addresses way too fast (just guessing). What if you download the firmware
again for that modem/router? can you turn off the dhcp server then?
I have set the lease time of the modem (with router functionality) to 65535 hours so that my router will practically always keep the same IP address. It has kept this same address for as long as I have set the network up like it is now. Note that there is only one device connected to the modem, which is the router, and all traffic from the modem is immediatelly forwarded to the router since the router is configured as the DMZ host in the options menu of the modem (that I could change!).
I can't do much with the modem, since my ISP has built in some settings which will be lost if I go tampering with the firmware of it, and my ISP doesn't publish those settings due to security... : |


kind regards,

Jos (not much of a networking man myself ;-)
Cripes, the man knows a great deal of mathematics, but som basic networking? No, sirree!
; )

Thanks for the time Jos, I do appreciate it.

Regards,
Bart.
Jul 19 '07 #4
JosAH
11,448 Expert 8TB
Cripes, the man knows a great deal of mathematics, but som basic networking? No, sirree!
; )

Thanks for the time Jos, I do appreciate it.

Regards,
Bart.
I have a bad allergy against networking under my armpits; I even carry a note
around that my medical doctor gave me: no networking for me ;-)

kind regards,

Jos
Jul 19 '07 #5

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