John McLaren wrote:
I stand corrected.. i should have said "udp length" rather than header length.
I was under the impression that this had to be multiples of long words also.
You can even send a 0 byte UDP packet if you want, so any length >= 8
(the header size) is valid.
Nonetheless... what is the need for any data in this packet? Traceroute
uses incrementing to assure that the return packets can be effectively
ID'd, right?
traceroute is a testing tool. Since you might want to determine where
packets to host X of size greater than Y bytes are being dropped, adding
data bytes is useful.
If nothing else, this anomoly might be useful in identifying certain router
types that consider this to be a mal-formed packet.
I think it's very likely that Cisco can build RFC791-compliant routers.
The most likely source of problems here is the NAT setup.
JMcLaren
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Casey Carter
Casey@Carter.net
ccarter@uiuc.edu
AIM: cartec69
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