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Old 01-06-2004, 04:25 AM   #1
LQ Newbie
Registered: Dec 2003
Location: Brussels
Distribution: Debian
Posts: 22

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APT-GET troubles - networking? MTU?

Hi all,

I am using a brand new optiplex gx270 from Dell.
Using the embedded intel 1000 NIC and a 3c905.

I can surf (via an ADSL router) quite fine : telnet, ftp, web BUT doing apt-get is a nightmare. I am using the same source list than my other machine which is doing just fine (nope, it ain't a server down issue).

I tried to configure my kernel as close as the other machine for the networking options...but it still have this issue....

Some apt server can be touched and accessed, some are very very too slow and some simply doesn't respond.

I changed the MTU to different value 1500, 1000, 700 and 300..same problem.

I made myself sure that /proc/sys/net/ipv4/tcp_ecn contains 0

really lost...

any idea is welcome

thank you all.


Old 01-06-2004, 11:29 AM   #2
LQ Newbie
Registered: Oct 2003
Posts: 26

Rep: Reputation: 15
could be a number of issues:

1. Do you have a firewall and is this set up for NAT and correctly?
2. Could be slow net works?
3. look in /proc/sys/net/ipv4/tcp_rmem amd tcp_wmem. I had to reduce the default values to about 25000 (in the middle value ) as it was send packets more than once
4 When you say you have set MTU, have you set this on the router AND the linux box. Should be the same. I use a value of 1430
5. Look at fro more linux info
6. use traceroute to look at the route to the server

Hope that is a starter



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