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Subject: More on [kxchg: recv: Message too long]
From: Alexey Pushkin <Alexey.Pushkin,AT,altinex,DOT,no>
Date: Wed, 20 Jun 2001 13:05:40 +0200
In-reply-to: <3B30643B.6010607@altinex.no>

I have investigated this problem a bit,
it appeares that CIPE stops working ("kxchg: recv: Message too long")
when on one of the intermediate network segments the MTU is
set to a value less than 1500. I guess it shouldn't be like this, right ?

(The reason for changing MTU is to improve quality in a radio link)

Alexey Pushkin wrote:

> Hi, I get this error message ("kxchg: recv: Message too long")
> whenever I try to do SSH or IMAP to the peer. Ping works though :-)
> 
> Could anybody please help me with this ?
> 
> I'm using stock kernel & cipe from RedHat 7.1 CD that is
> kernel 2.4.2 , cipe 1.4.5.
> 
> I also tried the latest cipe 1.5.2 with same success :-(
> 
> With debug level 10 it looks like this:
> 
> .....
> Jun 19 16:33:16 mererand kernel: cipcb: sa=217.68.102.228 
> da=212.188.77.140 us=31123 ud=31123 ul=80
> Jun 19 16:33:16 mererand kernel: cipcb1: decrypt len=57 pad=7 typ=00
> Jun 19 16:33:16 mererand kernel: cipcb1: real src 10.1.1.4 dst 10.1.1.9 
> len 57
> Jun 19 16:33:16 mererand kernel: cipcb1: encrypt typ 0 pad 7 len 704
> Jun 19 16:33:16 mererand ciped-cb[17392]: kxchg: recv: Message too long
> Jun 19 16:33:26 mererand kernel: cipcb1: encrypt typ 0 pad 3 len 520
> Jun 19 16:33:26 mererand kernel: cipcb1: returning 9 flags c31aff70
> Jun 19 16:33:26 mererand kernel: cipcb1: encrypt typ 2 pad 4 len 128
> Jun 19 16:33:26 mererand ciped-cb[17392]: kxchg: recv: Message too long
> Jun 19 16:33:26 mererand kernel: cipcb: sa=217.68.102.228 
> da=212.188.77.140 us=31123 ud=31123 ul=296
> Jun 19 16:33:26 mererand kernel: cipcb1: decrypt len=274 pad=6 typ=02
> Jun 19 16:33:26 mererand kernel: cipcb1: returning 274 flags c31aff70
> Jun 19 16:33:26 mererand kernel: cipcb1: encrypt typ 2 pad 3 len 312
> Jun 19 16:33:26 mererand kernel: cipcb: sa=217.68.102.228 
> da=212.188.77.140 us=31123 ud=31123 ul=88
> Jun 19 16:33:26 mererand kernel: cipcb1: decrypt len=65 pad=7 typ=02
> Jun 19 16:33:26 mererand kernel: cipcb1: returning 65 flags 0000
> Jun 19 16:33:29 mererand kernel: cipcb1: encrypt typ 0 pad 7 len 72
> Jun 19 16:33:32 mererand kernel: cipcb1: encrypt typ 0 pad 3 len 520
> Jun 19 16:33:32 mererand ciped-cb[17392]: kxchg: recv: Message too long
> .....
> 
> Best, Alexey
> 
> 
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