On Wed, 19 Jan 2000, Sarel J. Botha wrote:
|On Tue, Jan 18, 2000 at 12:25:25PM -0600, Clifford Kite wrote:
|> On Tue, 18 Jan 2000, Mithun Bhattacharya wrote:
|>
|> able to receive 1500 and mtu is not a negotiated LCP option. I'd use mtu
|> 576 and mru 576, which are likely to cause the least trouble.
|
|Actually mtu and mru settings of 576 cause a bit of trouble sometimes too.
|Particularly with some Online Banking sites which block ALL icmp traffic.
|See, MTU and MRU negotiation are done using icmp, so if icmp can't pass the
|only mtu and mru that'll work is the default: 1500.
I don't follow that reasoning, but admit I'm not very knowledgeable about
PMTU negotiation, which seems to be what you are writing about. I would
expect that those MTU and MRU are maximum values and any packet smaller
would be acceptable. My thought was that 576 was a generally accepted
default for Ethernet before PMTU was implemented, and some sites may still
not implement PMTU negotiation so the 576 would help with them.
|The symptom: ALL connections time out.
I'd expect that if the packet size was larger but when it's not smaller.
??
---
Clifford Kite Not a guru. (tm)
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