tcpdump :truncated-ip - 40898 bytes missi... What does this mean - Thread - go-pugleaf

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4 total messages Started by Dmitri Barsoukov Wed, 27 Oct 1999 00:00

tcpdump :truncated-ip - 40898 bytes missi... What does this mean

#543

Author: Dmitri Barsoukov
Date: Wed, 27 Oct 1999 00:00

18 lines
1201 bytes

Hello,

I use AVM !Fritz PCI ISDN card when snooping the interface (ippp0), I
have a lot of similar messages. What does this mean?

# tcpdump -i ippp0

.....

23:42:06.922683 truncated-ip - 40898 bytes missing!0.52.120.213 >
64.0.64.6: ip-proto-0 40960 [ttl 0]


... 

Thanks,

Dmitri

Re: tcpdump :truncated-ip - 40898 bytes missi... What does this mean

#544

Author: Mike Pellatt
Date: Thu, 28 Oct 1999 00:00

16 lines
1357 bytes

On Wed, 27 Oct 1999 23:30:24 +0100, Dmitri Barsoukov
<dmitri@nexusnetwork.co.uk> wrote:
>Hello,
>
>I use AVM !Fritz PCI ISDN card when snooping the interface (ippp0), I
>have a lot of similar messages. What does this mean?

[ snip ]

It means that tcpdump doesn't work properly on ppp interfaces. The
encapsulation is different from that on an ethernet interface.

It's much the same if you run it on a token rung i/f.

-- 
Mike Pellatt

Re: tcpdump :truncated-ip - 40898 bytes missi... What does this mean

#545

Author: Dmitri Barsoukov
Date: Thu, 28 Oct 1999 00:00

28 lines
1832 bytes

Mike Pellatt wrote:
> 
> On Wed, 27 Oct 1999 23:30:24 +0100, Dmitri Barsoukov
> <dmitri@nexusnetwork.co.uk> wrote:
> >Hello,
> >
> >I use AVM !Fritz PCI ISDN card when snooping the interface (ippp0), I
> >have a lot of similar messages. What does this mean?
> 
> [ snip ]
> 
> It means that tcpdump doesn't work properly on ppp interfaces. The
> encapsulation is different from that on an ethernet interface.
> 
> It's much the same if you run it on a token rung i/f.
> 
> --
> Mike Pellatt

Thanks, Mike

Are there any tools available to snoop (i)ppp# interface. Will pppd
debug be the right tool. The problem is that my ISDN connection degrades
after some time and even pinging ippp0 peer becomes impossible and I
need to restart isdn4linux. BT, my telco, and my ISP both claim there is
no fault on thier parts

Dmitri

Re: tcpdump :truncated-ip - 40898 bytes missi... What does this mean

#546

Author: Mark Evans
Date: Sat, 30 Oct 1999 00:00

15 lines
1460 bytes

Mike Pellatt <newsfrom@pellatt.co.uk> wrote:
> On Wed, 27 Oct 1999 23:30:24 +0100, Dmitri Barsoukov
> <dmitri@nexusnetwork.co.uk> wrote:
>>Hello,
>>
>>I use AVM !Fritz PCI ISDN card when snooping the interface (ippp0), I
>>have a lot of similar messages. What does this mean?

> [ snip ]

> It means that tcpdump doesn't work properly on ppp interfaces. The
> encapsulation is different from that on an ethernet interface.

It does work on ordinary PPP, however it appears confused by the
HLDC used in SyncPPP.

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