"Jacek Zem³o" <(E-Mail Removed)> writes:
> Hi,
> I have strange problem with one of my serwer
>
> ping works great to certain packet size
>
> ping -s 494 s4.my-fantasy.net
> PING s4.my-fantasy.net (193.218.155.58) 494(522) bytes of data.
> 502 bytes from 193.218.155.58: icmp_seq=0 ttl=63 time=0.553 ms
> 502 bytes from 193.218.155.58: icmp_seq=1 ttl=63 time=0.647 ms
> 502 bytes from 193.218.155.58: icmp_seq=2 ttl=63 time=0.566 ms
>
> --- s4.my-fantasy.net ping statistics ---
> 3 packets transmitted, 3 received, 0% packet loss, time 2001ms
> rtt min/avg/max/mdev = 0.553/0.588/0.647/0.050 ms, pipe 2
>
> but one byte more:
>
> ping -s 495 s4.my-fantasy.net
> PING s4.my-fantasy.net (193.218.155.58) 495(523) bytes of data.
Probably you want to reduce your MTU (Maximum Transmission Unit) size
down, then. It looks like the full size of the packets is 522 bytes
(494 bytes of data plus headers), so that's probably about what your
MTO should be set to. How to do so is OS-specific, but if you post
the server's OS somebody here will probably know. I see you have
posted to a Linux newsgroup, so you might want something like:
ifconfig eth1 mtu 522
You can play with the numbers a bit to see what works.
That MTU size seems smaller than I'm used to seeing, and a properly
configured router should just fragment the packets and send them
through, so it does seem a little strange.
Good luck,
----Scott.
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