FreeBSD 7.0 and pf
norman at apache.org
Wed Mar 19 01:40:12 PDT 2008
Am Mittwoch, den 19.03.2008, 14:04 +0530 schrieb Girish Venkatachalam:
> On 07:56:48 Mar 19, Norman Maurer wrote:
> > Hi all,
> > im using freebsd 7.0 + gif interfaces + racoon + pf to filter stuff on
> > my box. After upgrading to freebsd 7.0 I see some strange behavior. I
> > see packets get dropped because of bad hdr length. The problems only
> > seems to happen on traffic between the local nets and nets routed via
> > ipsec. Here is a tcpdump snipped:
> > block in on em5: 192.168.175.4.1107 > 192.168.116.6.22: tcp 544 [bad
> > hdr length 12 - too short, < 20]
> > gif interface:
> > gif5: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1402
> > tunnel inet 22.214.171.124 --> 126.96.36.199
> > inet 192.168.116.1 --> 192.168.175.1 netmask 0xffffff00
> > Any help is welcome.
> A TCP header can never be less than 20 bytes.
> And 12 is odd since all headers are a multiple of 4 bytes (word
> Check your MTU of the PPPoE/PPPoA/Ethernet/WiFi or whatever datalink
> layer. I bet there is a problem there.
Maybe the problem is the mtu of the gif interface ( 1402 ) ?
I have a 4 mbit broadband connection ( no dsl ).
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