Charles Sprickman wrote:
On Sat, 10 Sep 2005, Julian H. Stacey wrote:
-Are there any tunables at either end (both hosts are FreeBSD 4.11
p11) to
alter how fragmented packets are re-assembled?
/usr/ports/net/tcpmssd
An MTU adapter. Apparently not needed on FreeBSD-5 but I mean to
install it on my FreeBSD-4 DSL gateways when I find time to think if
it might
have any implications re ipfw & security.
I don't think that does anything to UDP, it just digs into tcp and
"fixes up" the MSS by altering it on outgoing packets. I'm looking to
further understand UDP fragmentation and why a host might ignore
fragments, and who along the way is actually doing the fragmentation.
My current "fix" is just to set the interface MTU on the sending box to
1492, and that works well, but I'd really like to understand why it
fails without that.
Do you know about the horribly-large overhead that PPPoE adds?
It's about 36 bytes, if I recall. So to keep the *total* ethernet frame
size under the max limit of 1500-something (don't recall exact number),
you *always* have to limit *any* frame size, before PPPoE overhead,
to 1492 bytes. Does this help?
Gary
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