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Old 10-15-2003, 05:45 AM   #1
Registered: Jul 2003
Distribution: Gentoo
Posts: 168

Rep: Reputation: 30
Unhappy Bad performance & reliability with linux router. Why? =(


Up to yesterday my linux box was directly connected to the internet via a DSL connection. Now I got my hands onto a Pentium MMX 200 with 128MB ram which I wanted to turn into a firewall and eventually into a proxy/mail/dns/etc. server.

I now have it connect to the internet and masquerade to the internal lan. Also I have a firewall running on it and adjusted the one on my client box accordingly. However I noticed massive loss in reliability and performance and I don't know what is going wrong.

1) The router forwards incoming connections on two ports (one tcp and one udp) in order to get xmule running correctly on my client. This seems to work as I can connect to many servers quickly and I do get high IDs (which indicates that the port forwarding works correctly). But when I connected without the router my average download rates were about 40-90kb/sec, now I get only 0-5kb/sec and I left it running the whole night and on different servers. I don't see the router blocking any connections on the ports that I need so I don't know why this happens.

2) Another problem is with ftp. I wanted to download about 800mb of updates from an ftp server over night but the connection kept dropping after 15-30 mins. Even when I tried different servers. I don't have a clue either why this happens. (ports 20 and 21 are being accepted)

3) My third problem is that I can connect to almost any website without a problem. Only some sites like and do not work, I don't seem to get any answer back from these sites. I only have this problem when I have the router in place. With a direct connection, I can connect to these.

I would appreciate any hints or explanation as I think I made some mistake with the configuration but I can't seem to find it.

I can post both firewall scripts if you need more information but I didn't yet because they are generated by fwbuilder (lame, I know...) and are thus quite spammy.

Good bye!
Old 10-15-2003, 11:37 AM   #2
Registered: Jul 2002
Location: Florida
Distribution: Centos, Slackware
Posts: 260

Rep: Reputation: 30
crappy NICs in the router?
Old 10-15-2003, 12:11 PM   #3
Registered: Jul 2003
Distribution: Gentoo
Posts: 168

Original Poster
Rep: Reputation: 30
I admit, that _might_ be the case, bbeers. The only NIC is a KTI ET32P2. I have never heard from that company and/or model name. However considering that this PC had been an NT server for two years or more for some company, I'd be a little surprised if this was the case.

I will do some research on this, thanks a lot for the hint!


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