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>Mark Scandariato <[EMAIL PROTECTED]> wrote:
>>
>> I'm having the problem, apparently caused by the MTU not being 1500,
>> reported so often: WWW access occasionally stalls.
>>
>> However, my DSL provider is using PPP over ethernet (PPPoE) which
>> requires an MTU of 1492.
>>
>> The interface to the DSL modem (eth0) has an MTU of 1500, but the
>> PPPoE interface (ppp0) has an MTU of 1492.
>
>I've seen this problem posted several times, but since I have no test
>environment similar to this, I can't try different things.
>
>The best idea I can think of (short of actually finding the nature of
>the MTU problem and fixing it) is to reduce the MTU of all your internal
>network interfaces, to match the PPPoE MTU size.
A much simpler solution is to increase the MTU of the PPP connection to 1500
(or whatever your internal network MTU is). When I was running a modem
connection, this had the added benefit of increasing my modem throughput
aswell.
Being a network server engineer I have seen this kind of bug in many
products that are doing any kind of protocol conversion with packet sizes
differing between inbound and outbound data. It is common to forget to take
into account that inbound data may have to be broken into smaller packets on
the outbound side. In the case of NAT conversions, I can imagine this to be
a sticky problem keeping things like sequence numbers correct...
--
Carl
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