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Re: TCP/IPv6 broken in Linux 2.5.64?

To: Erik Hensema <erik@xxxxxxxxxxx>
Subject: Re: TCP/IPv6 broken in Linux 2.5.64?
From: bert hubert <ahu@xxxxxxx>
Date: Tue, 18 Mar 2003 17:25:32 +0100
Cc: netdev@xxxxxxxxxxx
In-reply-to: <20030318131104.GA16367@xxxxxxxxxxx>
Mail-followup-to: bert hubert <ahu@xxxxxxx>, Erik Hensema <erik@xxxxxxxxxxx>, netdev@xxxxxxxxxxx
References: <20030318131104.GA16367@xxxxxxxxxxx>
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On Tue, Mar 18, 2003 at 02:11:04PM +0100, Erik Hensema wrote:
> Hi,
> 
> I'm trying to upgrade to Linux 2.5.x from 2.4.x. It seems to be working
> fine, except for IPv6: a TCP session can be established, but I can't send
> data. I can receive it though.

I can confirm this. 2.5.65 can connect to other hosts out there, like ipv6
irc servers, or an IPv6 zonetransfer. However, when I try to ssh from 2.5.65
to another 2.5.65, nothing happens.

2.4.18 can also ssh to 2.5.65.

So we have:

       to:      2.4.18  2.5.65
from:
2.4.18            OK     OK
2.5.65            OK     ERROR


tcpdump from 2.5.65 to 2.5.65:

25.987220 hostA.33180 > hostB.22: S 2721590261:2721590261(0) win 5760
        <mss 1440,sackOK,timestamp 15005149 0,nop,wscale 0>

25.987490 hostB.22 > hostA.33180: S 2377513523:2377513523(0) 
        ack 2721590262 win 5712 
        <mss 1440,sackOK,timestamp 5200381 15005149,nop,wscale 0>

25.987622 hostA.33180 > hostB.22: . ack 1 win 5760 
        <nop,nop,timestamp 15005149 5200381>

25.993273 hostB.22 > hostA.33180: P 1:41(40) ack 1 win 5712 
        <nop,nop,timestamp 5200387 15005149>
26.193443 hostB.22 > hostA.33180: P 1:41(40) ack 1 win 5712 
        <nop,nop,timestamp 5200588 15005149>
26.757236 hostB.22 > hostA.33180: P 1:41(40) ack 1 win 5712 
        <nop,nop,timestamp 5201152 15005149>

The originating host does not ACK the received data, it appears. No IPSEC
is involved with this.

Regards,

bert

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