Public bug reported:
In Ubuntu 14.04 Desktop, when I ping the broadcast address (in my case the eth1
is 172.22.1.65/16):
ping -Ieth1 -b 255.255.255.255
OR
ping -b 172.22.255.255
The response from multiple host are NOT reflected properly. Intead the
subsequent response are marked (DUP!) BUT stamped with the same address
of the first received response.
Ex:
rtp-lab@wks65lnx:~$ ping -Ieth1 -bc2 255.255.255.255
WARNING: pinging broadcast address
PING 255.255.255.255 (255.255.255.255) from 172.22.1.65 eth1: 56(84) bytes of
data.
64 bytes from 172.22.0.10: icmp_seq=1 ttl=64 time=0.634 ms
64 bytes from 172.22.0.10: icmp_seq=1 ttl=255 time=0.647 ms (DUP!)
64 bytes from 172.22.0.10: icmp_seq=1 ttl=63 time=0.648 ms (DUP!)
64 bytes from 172.22.0.10: icmp_seq=1 ttl=64 time=1.83 ms (DUP!)
64 bytes from 172.22.0.10: icmp_seq=2 ttl=64 time=0.566 ms
>From wireshark/tcpdump, I can confirmed that those 3 duplicates packets
are coming from different hosts: 172.22.2.1, 172.22.0.10 (2 replies, not
sure why, but not important in this case), and 172.22.1.65 (itself, I
allow the node to answer broadcasted ping for this test).
rtp-lab@wks65lnx:~$ sudo tcpdump -ni eth1
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes
12:49:08.471063 IP 172.23.0.1.123 > 172.23.255.255.123: NTPv4, Broadcast,
length 48
12:49:09.000925 IP 172.22.1.65 > 255.255.255.255: ICMP echo request, id 21934,
seq 1, length 64
12:49:09.001424 IP 172.22.0.10 > 172.22.1.65: ICMP echo reply, id 21934, seq 1,
length 64
12:49:09.001437 IP 172.22.255.1 > 172.22.1.65: ICMP echo reply, id 21934, seq
1, length 64
12:49:09.003996 IP 172.22.0.10 > 172.22.1.65: ICMP echo reply, id 21934, seq 1,
length 64
12:49:09.004006 IP 172.22.2.1 > 172.22.1.65: ICMP echo reply, id 21934, seq 1,
length 64
12:49:10.001551 IP 172.22.1.65 > 255.255.255.255: ICMP echo request, id 21934,
seq 2, length 64
12:49:10.002093 IP 172.22.0.10 > 172.22.1.65: ICMP echo reply, id 21934, seq 2,
length 64
12:49:10.002106 IP 172.22.255.1 > 172.22.1.65: ICMP echo reply, id 21934, seq
2, length 64
12:49:10.002107 IP 172.22.0.10 > 172.22.1.65: ICMP echo reply, id 21934, seq 2,
length 64
12:49:10.003683 IP 172.22.2.1 > 172.22.1.65: ICMP echo reply, id 21934, seq 2,
length 64
The issue was NOT see in Ubuntu 12.04 Server. While those replies are
marked (DUP!) HOWEVER the 'from' address are correct.
** Affects: iputils (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1547611
Title:
Response from pinging broadcast address does not reflect the actual
sender address.
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