udp fragmentation

Max Laier max at love2party.net
Mon Jun 4 20:00:23 UTC 2007


Hi again,

On Monday 04 June 2007, Hugo Koji Kobayashi wrote:
> pf is running on the DNS client machine. The DNS server is on a
> completely different network (I don't control this server). The client
> can send the udp request with no problem (it's a small udp datagram;
> less than 512 bytes), the server sends the udp response fragmented,
> but the client can't receive it.
>
> Please, find attached a new test with the requested information.

> udp:
>         36 datagrams received
>         2 with bad checksum
>         34 delivered
>         40 datagrams output
<test>
> udp:
>         36 datagrams received
>         3 with bad checksum
>         33 delivered
>         41 datagrams output

Aha!  Can you confirm that "bad checksum" increases for every fragmented 
packet and I'll look for a cure.

-- 
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