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Carl MacDonald <[EMAIL PROTECTED]> wrote:
>
> A much simpler solution is to increase the MTU of the PPP connection
> to 1500 (or whatever your internal network MTU is).
If I understand PPP-over-Ethernet (and I do not), there is some sort of
technical difficulty that prevents the MTU from being raised higher than
1492. I don't know what that reason might be, but I see it posted often
enough to believe it.
Then again, maybe you have something there. It could be that the MTU of
the PPPoE interface will always be "MTU of ethernet minus 8". In which
case, perhaps the MTU of the outgoing ethernet interface could be raised
to 1508. But that violates RFC specifications, so probably has a good
chance of messing things up...
> 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.
Yes, and in fact, it is difficult to place the nature of this bug. I
have seen discussions among the Linux gurus, in which they were unable
to pin the nature of the problem down to anything internal to Linux,
because the problem could easily be in the remote network equipment.
> In the case of NAT conversions, I can imagine this to be a sticky
> problem keeping things like sequence numbers correct...
In IP Masq, this is handled more-or-less well by reconstructing
fragmented packets before forwarding them. Thus, they are essentially
rebuilt and refragmented, but it does prevent fragments from being lost,
since fragments do not carry port information...
--
[EMAIL PROTECTED] (Fuzzy Fox) || "Good judgment comes from experience.
sometimes known as David DeSimone || Experience comes from bad judgment."
http://www.dallas.net/~fox/ || -- Life Lessons
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