Hi, 2016-04-13 2:52 GMT+09:00 Daniele Orlandi <dani...@orlandi.com>: > > Hello, > > More than one year ago I posted the following message but it hasn't > received a reply, now I've been stung by a similar issue, you may want > to investigate: > > > I noticed that when ping receives ICMP messages from different sources > the first IP address is always used and displayed: > > > vihai@seviolab:~$ ping -V > ping utility, iputils-s20121221 > > This is a (simulated) flapping route: > > vihai@seviolab:~$ ping 10.254.10.140 > PING 10.254.10.140 (10.254.10.140) 56(84) bytes of data. > From 192.168.1.1 icmp_seq=1 Destination Host Unreachable > From 192.168.1.1 icmp_seq=2 Destination Host Unreachable > From 192.168.1.1 icmp_seq=3 Destination Host Unreachable > 64 bytes from 192.168.1.1: icmp_seq=4 ttl=61 time=24.7 ms > 64 bytes from 192.168.1.1: icmp_seq=5 ttl=61 time=25.6 ms > 64 bytes from 192.168.1.1: icmp_seq=6 ttl=61 time=69.6 ms > From 192.168.1.1 icmp_seq=7 Destination Host Unreachable > From 192.168.1.1 icmp_seq=8 Destination Host Unreachable > From 192.168.1.1 icmp_seq=9 Destination Host Unreachable > ^C > --- 10.254.10.140 ping statistics --- > 9 packets transmitted, 3 received, +6 errors, 66% packet loss, time 8001ms > rtt min/avg/max/mdev = 24.797/40.061/69.692/20.955 ms > > > The sources, however are different: > > vihai@seviolab:~$ sudo tcpdump -n icmp > tcpdump: verbose output suppressed, use -v or -vv for full protocol decode > listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes > ^[OA^[OA^[OA17:09:55.932981 IP 192.168.1.21 > 10.254.10.140: ICMP echo > request, id 9278, seq 1, length 64 > 17:09:55.933234 IP 192.168.1.1 > 192.168.1.21: ICMP host 10.254.10.140 > unreachable, length 92 > 17:09:56.933169 IP 192.168.1.21 > 10.254.10.140: ICMP echo request, id > 9278, seq 2, length 64 > 17:09:56.933416 IP 192.168.1.1 > 192.168.1.21: ICMP host 10.254.10.140 > unreachable, length 92 > 17:09:57.933160 IP 192.168.1.21 > 10.254.10.140: ICMP echo request, id > 9278, seq 3, length 64 > 17:09:57.933404 IP 192.168.1.1 > 192.168.1.21: ICMP host 10.254.10.140 > unreachable, length 92 > 17:09:58.933163 IP 192.168.1.21 > 10.254.10.140: ICMP echo request, id > 9278, seq 4, length 64 > 17:09:58.957939 IP 10.254.10.140 > 192.168.1.21: ICMP echo reply, id > 9278, seq 4, length 64 > 17:09:59.935050 IP 192.168.1.21 > 10.254.10.140: ICMP echo request, id > 9278, seq 5, length 64 > 17:09:59.960724 IP 10.254.10.140 > 192.168.1.21: ICMP echo reply, id > 9278, seq 5, length 64 > 17:10:00.936177 IP 192.168.1.21 > 10.254.10.140: ICMP echo request, id > 9278, seq 6, length 64 > 17:10:01.005849 IP 10.254.10.140 > 192.168.1.21: ICMP echo reply, id > 9278, seq 6, length 64 > 17:10:01.936313 IP 192.168.1.21 > 10.254.10.140: ICMP echo request, id > 9278, seq 7, length 64 > 17:10:01.936626 IP 192.168.1.1 > 192.168.1.21: ICMP host 10.254.10.140 > unreachable, length 92 > 17:10:02.935321 IP 192.168.1.21 > 10.254.10.140: ICMP echo request, id > 9278, seq 8, length 64 > 17:10:02.935591 IP 192.168.1.1 > 192.168.1.21: ICMP host 10.254.10.140 > unreachable, length 92 > 17:10:03.934322 IP 192.168.1.21 > 10.254.10.140: ICMP echo request, id > 9278, seq 9, length 64 > 17:10:03.934613 IP 192.168.1.1 > 192.168.1.21: ICMP host 10.254.10.140 > unreachable, length 92 >
Thank you for your report. I'll try fixing it. --yoshfuji > > > > Tried with a different ping implementation (RouterOS) and the behaviour > seems correct: > > [vihai@SevioLab SW1] > ping 10.254.10.140 > HOST SIZE TTL TIME STATUS > 192.168.1.1 84 64 0ms host unreachable > 192.168.1.1 84 64 0ms host unreachable > 192.168.1.1 84 64 0ms host unreachable > 10.254.10.140 56 61 20ms > 10.254.10.140 56 61 46ms > 10.254.10.140 56 61 37ms > 192.168.1.1 84 64 0ms host unreachable > 192.168.1.1 84 64 0ms host unreachable > 192.168.1.1 84 64 0ms host unreachable > sent=9 received=3 packet-loss=66% min-rtt=20ms avg-rtt=34ms max-rtt=46ms > > > Recently I was pinging with IPv6, a router in between filtered the > packet, however the shown source address was not the right one: > > root@monitor:~# ping6 -i 0.2 www.google.com > PING www.google.com(mil01s25-in-x04.1e100.net) 56 data bytes > From mil01s25-in-x04.1e100.net icmp_seq=1 Destination unreachable: No route > From mil01s25-in-x04.1e100.net icmp_seq=2 Destination unreachable: No route > From mil01s25-in-x04.1e100.net icmp_seq=3 Destination unreachable: No route > > 19:33:19.589285 IP6 2a01:2d8:aca0:fce:944e:c8ff:fe4d:96de > > mil01s25-in-x04.1e100.net: ICMP6, echo request, seq 1, length 64 > 19:33:19.611666 IP6 mix-br2.intercom.it > > 2a01:2d8:aca0:fce:944e:c8ff:fe4d:96de: ICMP6, destination unreachable, > unreachable route mil01s25-in-x04.1e100.net, length 112 > > > Bye, >
