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On Thu, Sep 02, 2010 at 04:55:32PM +0800, eric li wrote:
> Hi,all
>
> I have a problem when use LVS:
>
> director use Tunnel Mode
> a UDP server running on the realserver
>
> when client send UDP requests to lvs, it can not receive the realserver's
> response.
>
>
> I capture packets on the director using ethereal, the packet shows that:
>
> director receives the requests , but dose not transmit then to
> realserver
> the requests size is 1464(not include the UDP and IP header)
> the IP header set the DON'T FRAGMENT to 1
>
>
> i guess the reason is like that:
>
> requests size is 1464 and plus UDP and IP header will become 1492.
> when director add a IP header on it,its size will be 1512, which exceeds the
> MTU(1500). Because the IP header set the DON'T FRAGMENT to 1, director only
> have to drop the packets.
>
>
> Can anynoe tell me why ?
>
> Why the the IP header's DON'T FRAGMENT flag is 1?
Hi Eric,
off-hand I don't have an answer for that.
But could you try manually reducing the MTU on the client
to see if that helps?
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