slow internet?

Hi there,
I recently encountered a problem on one of my servers.
The problem is that a server has a 100 mbit connection, and it barely gets 10 mbit. When it was on windows, it did get what it had, and now i had put a Slackware 10 on it, installed a 2.6.9 kernel + 2.6.10-rc3 patch, and installed a APF firewall.
When trying to download something, it starts downloading fine, and then downgrades to ~10 kb/s. Ifconfig shows that there is a lot of errors && collisions ...
Any ideas ?
PS. output of ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:11:2Fslow internet?F:F1:E4
inet addr:212.122.xxx.xxx Bcast:212.122.xxx.xxx Mask:255.255.255.192
inet6 addr: fe80::211:2fff:fedf:f1e4/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:140148107 errors:0 dropped:0 overruns:0 frame:0
TX packets:138635636 errors:306505 dropped:0 overruns:0 carrier:613010
collisions:257172 txqueuelen:1000
RX bytes:1767580224 (1685.6 Mb) TX bytes:43428352 (41.4 Mb)
Interrupt:10 Base address:0xd400

 

 

 

 

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