On 06/02/2014 11:18 AM, CLOSE Dave issued this missive:
On Fedora 20 x86_64.
According to "man ping", ping should work from a subinterface specifying
either the interface name or its address:
-I interface
interface is either an address, or an interface name. If inter‐
face is an address, it sets source address to specified inter‐
face address. If interface in an interface name, it sets source
interface to specified interface.
I've got a subinterface and I'm trying to ping from it.
# ifconfig eth3:sub1
eth3:sub1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.17.30.143 netmask 255.255.254.0 broadcast 172.17.31.255
ether 90:e2:ba:34:46:41 txqueuelen 1000 (Ethernet)
device memory 0xdc7e0000-dc800000
If I ping from the address, it works as specified. If I specify the
interface name instead, I see:
# ping -I eth3:sub1 172.17.30.1
ping: SO_BINDTODEVICE: Invalid argument
Investigating a little deeper:
# strace ping -I eth3:sub1 172.17.30.1
execve("/usr/bin/ping", ["ping", "-I", "eth3:sub1", "172.17.30.1"], [/* 38 vars */]) = 0
...
setsockopt(4, SOL_SOCKET, SO_BINDTODEVICE, "eth3:sub1\0", 13) = -1 ENODEV (No such device)
...
+++ exited with 2 +++
Any thoughts?
"eth3:sub1" isn't an interface, it's an alias. The interface name is
the bit before the ":" (or "." in the case of a VLAN).
If you were to do a "netstat -rn", you'd only see "eth3" as a network
device. You wouldn't see "eth3:sub1" listed.
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital ricks@xxxxxxxxxxxxxx -
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- First Law of Work: -
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