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Old 14th December 2009
J65nko J65nko is offline
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Join Date: May 2008
Location: Budel - the Netherlands
Posts: 3,507
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How are you testing?

On my PII OBSD firewall I get a much lower download speed then on my Athlon 3700+ OBSD system which is behind the PII.

A couple of month my ISP increased my ADSL line from about 3000Kbit/s to 7296.
On my amd64 workstation the download speed only improved after changing net.inet.tcp.recvspace=32768 into net.inet.tcp.recvspace=65535

Please note that increasing the receive space only works for the receiving end, not for a router.

What is the output of ifconfig?
Code:
$ ifconfig re0
re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr 00:19:db:47:b0:4c
        groups: egress
        media: Ethernet autoselect (100baseTX full-duplex,rxpause,txpause)
        status: active
        inet 192.168.222.20 netmask 0xffffff00 broadcast 192.168.222.255
        inet6 fe80::219:dbff:fe47:b04c%re0 prefixlen 64 scopeid 0x2
Make sure it runs full-duplex and 100baseTX.
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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump
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