traceroute, tunnel or...?

[Vyacheslav Vovk]

[44] vovk at sl:~>uname -a
FreeBSD xx.km.ua 4.10-STABLE FreeBSD 4.10-STABLE #13: Mon Oct  4 09:18:11
 EEST 2004     vovk at xx.km.ua:/usr/src/sys/compile/xx  i386

[45] vovk at sl:~>ifconfig gif0
gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1280
        tunnel inet 192.168.144.9 --> 192.168.144.1
        inet 195.46.39.98 --> 195.46.39.97 netmask 0xfffffffc

After upgrade from 4.10-RELEASE to 4.10-STABLE has ceased to work UDP
traceroute to 195.46.39.98 from external host.

[258] vovk at info:/>t 195.46.39.98
traceroute to 195.46.39.98 (195.46.36.98), 64 hops max, 44 byte packets
 1  cindy-fa0-vid0.ic.km.ua (195.46.36.7)  0.270 ms  0.589 ms  0.266 ms
 2  * * *
 3  * * *
 4  *

 [46] vovk at sl:~>tcpdump -n -i gif0 host 195.46.36.1
tcpdump: listening on gif0
15:29:44.663473 195.46.36.1.37640 > 195.46.39.98.33438: udp 16 [ttl 1]
15:29:49.678637 195.46.36.1.37640 > 195.46.39.98.33439: udp 16 [ttl 1]
15:29:54.690954 195.46.36.1.37640 > 195.46.39.98.33440: udp 16 [ttl 1]
15:29:59.767877 195.46.36.1.37640 > 195.46.39.98.33441: udp 16
15:30:04.703614 195.46.36.1.37640 > 195.46.39.98.33442: udp 16
15:30:09.732862 195.46.36.1.37640 > 195.46.39.98.33443: udp 16

but work ICMP traceroute

[260] vovk at info:/etc/namedb/pri>t -P icmp 195.46.39.98
traceroute to 195.46.39.98 (195.46.36.98), 64 hops max, 64 byte packets
 1  cindy-fa0-vid0.ic.km.ua (195.46.36.7)  0.278 ms  0.209 ms  0.733 ms
 2  RE-2M.sl (195.46.39.98)  34.505 ms  42.646 ms  48.319 ms

[47] vovk at sl:~>tcpdump -n -i gif0 host 195.46.36.1

15:33:56.245450 195.46.36.2 > 195.46.39.98: icmp: echo request [ttl 1]
15:33:56.245527 195.46.39.98 > 195.46.36.2: icmp: echo reply
15:33:56.306208 195.46.36.2 > 195.46.39.98: icmp: echo request [ttl 1]
15:33:56.306275 195.46.39.98 > 195.46.36.2: icmp: echo reply
15:33:56.350447 195.46.36.2 > 195.46.39.98: icmp: echo request [ttl 1]
15:33:56.350516 195.46.39.98 > 195.46.36.2: icmp: echo reply

For what reasons has ceased to work traceroute, taking into account what at
upgrade from 4.10-R to 4.10-STABLE did not vary firewall and kernel options?

--
wbr, slava [vovk-uanic]
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