On Thu, 18 May 2000, Keith Owens wrote:
> You have a path MTU problem. Somewhere between your gateway and the
> outside world is a link with an MTU < 1500, it is probably the
> Livingston Portmaster at your ISP that you dial into. Several sites
We use a dedicated line over; two Couriers at the ends.
This is quite possible; is this fixable there? Why haven't I seen this on
other dedicated lines over there? Different port settings?
> that should know better block all ICMP so they never see the "need to
> fragment" responses. Either push the MTU on your PPP link up to 1500
> or change the Ethernet MTU on all your internal boxes to be the same as
> your PPP link.
I see, so what is happening is someone along the way is requesting
fragmentation, so we receive small packets that fit into our narrow MTU
tube. Sites block an ICMP 'please frag' and thus send back larger
packets.
I remain unable to understand why my gateway is able to connect fine, and
why _it_ doesn't defrag them so we can receive them internally. Changing
MTU on the ppp link fixed the problem.
Am I understanding this properly? (Should I sit down and read Steven's UNP
and Internetworking again?) Isn't there anything in /proc/sys/net/ipv4
that would adjust the defrag behaviour? Or is stuff getting lost before my
end?
Cheers,
--
/\ Christian Reis exists solely to answer [EMAIL PROTECTED]
\'`/ Async Free SW Development | http://async.com.br | +55 16 274 2497
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