Traceroute supporting ICMP ECHO
hogsett at csl.sri.com
Wed May 12 12:33:27 PDT 2004
> I'm using 4.7p1 here, and I've had all sorts of fun on occasion with
> traceroute and my various firewall/routers. The default traceroute will
> not work since UDP traffic is apparently blocked on the return. Opening up
> port ranges on my router just doesn't seem right. However, Linux
> traceroute has a -I option (I think Windows tracert uses ICMP ECHO by
> default) which allows it to work through a home firewall router. The
> FreeBSD port for mtr also works.
> Is there anyone who has considered adding this capability to FreeBSD?
I think its already there. ( 4.9-RELEASE-p3 )
-P Send packets of specified IP protocol. The currently supported
protocols are: UDP, TCP, GRE and ICMP. Other protocols may also
be specified (either by name or by number), though traceroute
does not implement any special knowledge of their packet for-
mats. This option is useful for determining which router along a
path may be blocking packets based on IP protocol number. But
see BUGS below.
More information about the freebsd-questions