FreeBSD 7.1 as a router - poor download speed, but normal upload

[krad]

2009/10/8 .kkursor <dot at kkursor.ru>

> Hello everybody! Please help me if you can.
> I have a home server built on Gigabyte MiniITX motherboard with VIA C3
> 800MHz CPU and 512M RAM aboard. The server acts as a file server,
> torrent downloader, router and mail and HTTP server.
> I have a PPTP connection to my ISP through the integrated network card.
> The network configuration is:
>
> [0:04] kkursor at dot.kkursor.ru ~ # ifconfig
> rl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
> 1500
>        options=8<VLAN_MTU>
>        ether 00:19:cb:54:c6:15
>        inet 192.168.0.26 netmask 0xffffff00 broadcast 192.168.0.255
>        media: Ethernet autoselect (100baseTX <full-duplex>)
>        status: active
> rl1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
> 1500
>        options=8<VLAN_MTU>
>        ether 00:0f:ea:e2:cd:e0
>        inet 192.168.158.102 netmask 0xffffff00 broadcast 192.168.158.255
>        media: Ethernet autoselect (100baseTX <full-duplex>)
>        status: active
> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
>        inet 127.0.0.1 netmask 0xff000000
> tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500
>        inet 195.98.183.20 --> 172.30.96.1 netmask 0xffffffff
>        Opened by PID 73795
> tun1: flags=8010<POINTOPOINT,MULTICAST> metric 0 mtu 1500
>
> rl1 is integrated network card and rl0 is an additional PCI NIC which is
> inserted into the only PCI slot on the motherboard. Connection to ISP is
> done over rl1 using port pptp-client.
> The problem is that there is very low download speed. My ISP provides
> symmetric 4Mbps line, but download speed is poor - about 1 Mbps. Upload
> speed is OK. I called ISP, they asked me to connect WinXP computer and
> measure speed. It was normal, therefore there is an issue in my server.
> If you could point me in the right direction, it would be wonderful.
> Thank you very much for your work!
>
> With best regards and looking forward for answer,
> Kirill Sarksyan, Russian Federation
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try turning the mtu on the tun0 interface to 1492. If it doent help try a
much lower setting eg 1450.