Public bug reported:
iputils-ping 3:20161105-1ubuntu2 amd64 18.04.1 LTS
In the following, "c7" is a host with the link-local address
fe80::5054:ff:fe45:1e87.
The mapping is in "/etc/hosts". It is reachable via the "enp2s0" interface on
the local
machine. I have masked the local machine's MAC address.
1. As a regular (non-root) user, ping returns "Invalid argument":
$ ping -I enp2s0 c7
PING c7(c7 (fe80::5054:ff:fe45:1e87)) from fe80::xxxx:xxff:fexx:xxxx%enp2s0
enp2s0: 56 data bytes
ping: sendmsg: Invalid argument
ping: sendmsg: Invalid argument
ping: sendmsg: Invalid argument
2. As root, ping works:
# ping -I enp2s0 c7
PING c7(c7 (fe80::5054:ff:fe45:1e87)) from fe80::xxxx:xxff:fexx:xxxx%enp2s0
enp2s0: 56 data bytes
64 bytes from c7 (fe80::5054:ff:fe45:1e87%enp2s0): icmp_seq=1 ttl=64 time=0.285
ms
64 bytes from c7 (fe80::5054:ff:fe45:1e87%enp2s0): icmp_seq=2 ttl=64 time=0.306
ms
64 bytes from c7 (fe80::5054:ff:fe45:1e87%enp2s0): icmp_seq=3 ttl=64 time=0.307
ms
3. Specifying the interface-qualified IPv6 address directly works:
$ ping fe80::5054:ff:fe45:1e87%enp2s0
PING fe80::5054:ff:fe45:1e87%enp2s0(fe80::5054:ff:fe45:1e87%enp2s0) 56 data
bytes
64 bytes from fe80::5054:ff:fe45:1e87%enp2s0: icmp_seq=1 ttl=64 time=0.476 ms
64 bytes from fe80::5054:ff:fe45:1e87%enp2s0: icmp_seq=2 ttl=64 time=0.408 ms
64 bytes from fe80::5054:ff:fe45:1e87%enp2s0: icmp_seq=3 ttl=64 time=0.395 ms
** Affects: iputils (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1808428
Title:
Ping of a link local address with -I as non-root produces "Invalid
argument"
Status in iputils package in Ubuntu:
New
Bug description:
iputils-ping 3:20161105-1ubuntu2 amd64 18.04.1 LTS
In the following, "c7" is a host with the link-local address
fe80::5054:ff:fe45:1e87.
The mapping is in "/etc/hosts". It is reachable via the "enp2s0" interface on
the local
machine. I have masked the local machine's MAC address.
1. As a regular (non-root) user, ping returns "Invalid argument":
$ ping -I enp2s0 c7
PING c7(c7 (fe80::5054:ff:fe45:1e87)) from fe80::xxxx:xxff:fexx:xxxx%enp2s0
enp2s0: 56 data bytes
ping: sendmsg: Invalid argument
ping: sendmsg: Invalid argument
ping: sendmsg: Invalid argument
2. As root, ping works:
# ping -I enp2s0 c7
PING c7(c7 (fe80::5054:ff:fe45:1e87)) from fe80::xxxx:xxff:fexx:xxxx%enp2s0
enp2s0: 56 data bytes
64 bytes from c7 (fe80::5054:ff:fe45:1e87%enp2s0): icmp_seq=1 ttl=64
time=0.285 ms
64 bytes from c7 (fe80::5054:ff:fe45:1e87%enp2s0): icmp_seq=2 ttl=64
time=0.306 ms
64 bytes from c7 (fe80::5054:ff:fe45:1e87%enp2s0): icmp_seq=3 ttl=64
time=0.307 ms
3. Specifying the interface-qualified IPv6 address directly works:
$ ping fe80::5054:ff:fe45:1e87%enp2s0
PING fe80::5054:ff:fe45:1e87%enp2s0(fe80::5054:ff:fe45:1e87%enp2s0) 56 data
bytes
64 bytes from fe80::5054:ff:fe45:1e87%enp2s0: icmp_seq=1 ttl=64 time=0.476 ms
64 bytes from fe80::5054:ff:fe45:1e87%enp2s0: icmp_seq=2 ttl=64 time=0.408 ms
64 bytes from fe80::5054:ff:fe45:1e87%enp2s0: icmp_seq=3 ttl=64 time=0.395 ms
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