Julian Elischer wrote:
Stephen Clark wrote:
Hi,
When I run traceroute thru a gre it doesn't seem to decrement the
ttl, so I get * * * for that hop. Can this be fixed?
Thanks,
Steve
you will need to define the setup and question better.
TTL is controlled by the IP stack which is unaware of which interface
it came in on and doesn't care which interface it goes out on. That
includes GRE interfaces.. Is it freebsd at both ends?
BTW * * * would come from an EXTRA decrement
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FreeBSD workstation 10.0.129.1<-->10.0.128.1 Freebsd FW "A" with gre over ipsec
tunnel<---->FreeBSD FW "B" with gre over ipsec tunnel 192.168.3.1<--->
192.168.3.86 linux workstation
$ sudo traceroute 192.168.3.86
traceroute to 192.168.3.86 (192.168.3.86), 64 hops max, 40 byte packets
1 HQFirewallRS.com (10.0.128.1) 0.575 ms 0.423 ms 0.173 ms
2 * * *
3 192.168.3.86 (192.168.3.86) 47.972 ms 45.174 ms 49.968 ms
No response from the FreeBSD "B" box.
When I do a tcpdump on "B" of the gre interface I see UDP packets
with a TTL of 1 but no ICMP repsonse packets being sent back.
If I do the traceroute from the linux workstation 192.168.3.86 I get
similar results - I don't see a response from the FreeBSD "A" box.
Regards,
Steve
--
"They that give up essential liberty to obtain temporary safety,
deserve neither liberty nor safety." (Ben Franklin)
"The course of history shows that as a government grows, liberty
decreases." (Thomas Jefferson)
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