Date: Tue, 28 May 2002 18:00:22 -0700 (PDT) From: Archie Cobbs <archie@dellroad.org> To: cseg@storming.org Cc: stable@FreeBSD.ORG, hackers@FreeBSD.ORG Subject: Re: Bad TCP checksum Message-ID: <200205290100.g4T10MX89078@arch20m.dellroad.org> In-Reply-To: <20020523081803.GA1730@torment.storming.org> "from Fred Souza at May 23, 2002 11:18:03 am"
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Fred Souza writes: > I'm experiencing something weird with my 4.6-RC box (compile of May 18). > What happens is that for some hosts it just won't calculate the > checksum properly, and thus my box is unable to start TCP connections > to those hosts. Here's a piece of the output of tcpdump: > > 19:16:55.759657 me.50441 > somehost.http: S [bad tcp cksum fffe!] > 2079216431:2079216431(0) win 65535 <mss 1452,nop,wscale 1,nop,nop, > timestamp 797082 0> (DF) [tos 0x10] (ttl 96, id 41580, len 60) > > Additional info that might help: The default route goes through the > tun0 interface, my ADSL service uses PPPoE and therefore I cannot > think of any other way to work it out on FreeBSD. ppp(8) was compiled > in the same day as the kernel, and I tried unloading firewalling and > nothing different occured (at least apparently). NAT is disabled here. Sounds like it might be the delayed checksum code. What Ethernet device driver are you using? -Archie __________________________________________________________________________ Archie Cobbs * Packet Design * http://www.packetdesign.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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