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Re: skb_checksum_help

To: David Coulson <david@xxxxxxxxxxxxxxxx>
Subject: Re: skb_checksum_help
From: Thomas Graf <tgraf@xxxxxxx>
Date: Mon, 24 Jan 2005 13:31:18 +0100
Cc: netdev@xxxxxxxxxxx
In-reply-to: <41F44FD6.4000205@xxxxxxxxxxxxxxxx>
References: <41F432BD.3000300@xxxxxxxxxxxxxxxx> <20050124003241.GJ23931@xxxxxxxxxxxxxx> <41F44FD6.4000205@xxxxxxxxxxxxxxxx>
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* David Coulson <41F44FD6.4000205@xxxxxxxxxxxxxxxx> 2005-01-23 20:31
> Thomas Graf wrote:
> 
> >Protocol: 17 (UDP)
> >Checksum: 0x7b08
> >Source: 211.32.117.11 (korean ip)
> >Destination: 10.1.1.5
> >
> >[0] The originator of this packet is likely a BSD based
> >UNIX box. It is unlikely that it dropped to 49 from 128
> >which I think is the base TTL windows uses. Only guessing
> >though.
> 
> Looks like a DNS packet. AFAIK, 53 is the only UDP port I NAT through 
> from the outside to 10.1.1.5. No idea if that really matters or not, 
> with respect to the contents of the IP packet.

Yes, this explains the repetive payload. Can you provide your complete
netfilter rule set?

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