problem with internet speed within my lan after linux router

ilovebytes · 11-26-2003, 06:42 AM

hi the problem is the following:

i have a linux box running redhat9 as a router which is connected to an adsl modem/router on on side and to my intern lan on the other side - when i go into the www direct on my router i have full speed with the connection but when i go to internet from one of the clients in the lan i only get about 5 -10 KB/s

i don`t know what the problem is , could it bethat the linux router is to slow - 200 Mhz Pentium 96 MB Ram and can`T handle the routing and the firewall ?

would be great if someone of you here could help me out

thx

greetz

ter_roshak · 11-26-2003, 07:29 AM

I wouldn't think that the problem is the router. I use a 486 with 16MB of RAM for a router and I achieve speeds of up to 800k/s.

Josh

ilovebytes · 11-27-2003, 11:34 AM

thx so the router should not be the problem , hmm so the lan seems to be the problem - i will take a closer look at my hub - maybe i am gona try a switch instead

or could it be i have no seperate dns running for my lan ? i only use the ones of my provider - is a dns a must have for a privat lan ?

thx for helping a noob out

greetz

ter_roshak · 11-27-2003, 01:03 PM

I don't think its the DNS, I don't have my own DNS for my lan, (not heard of that except in exceptional cases). What do you have connecting your machines? Are you using all ethernet devices?

gundelgauk · 11-27-2003, 03:31 PM

Greetings!

Indeed, even a 486 with 8-16MB of ram can be sufficient to be a router.

You said that you are using a hub; that _could_ be a reason for your problems. The word 'collision' comes to mind. I will tell you about an issue I once experienced:
I had a small network with a DSL modem, a router/proxy server and two clients. All of those were connected to one hub. Additionally the router had only one NIC. This provoked a lot of network collisions as every single packed had to be sent from the modem to the router and from the router to the clients. And the replies went to the router and from there to the router. So essentially every single packed had to be broad-casted twice by the hub - thus the collisions.
My solution was to put a second NIC (Network Interface Card) into the router. Then I connected the modem directly to the router's first NIC (via a crossover cable) and connected only its second NIC to the hub (where the clients are connected as well). Thus I solved my problem because I had much less collisions at the hub. I could also have solved this issue by simply using a switch instead of the hub however.

You _could_ have the same problem. I suggest you start a few downloads and let some ppl visit some http sites and take a look at your modem's 'collision' LED (if it has one). If it blinks rapidly then I suggest you try one of the two solutions I explained above (2 NICs in router or replacing the hub with a switch).

Good luck!

ilovebytes · 12-01-2003, 11:10 AM

thx for the answer well i have 2 nics in my linux router one is connected to the dsl modem one is connected to the hub - but the hub could be the problem i will try a switch instead

greetz

Puddlor · 02-10-2004, 11:41 AM

Hi,
I have the totally same problem.
The router is running on Redhat 9, it was working well via a cable modem.
but when I change to the ADSL modem( Sagem F@st 800), my local computer can not surf the webpage fluently.

I guest there are some very simple mistakes of network configuration, but I am not sure where they are.