Linux has a "feature" (I'd say this is a bug) to add an alias IP address(es) to the interface AND these addressess ARE NOT displayed by /sbin/ifconfig, netstat -rn, arp -na!!
There is a mysterious command /sbin/ip addr that actually shows the hidden aliaes.
Here is a proof-of-concept code: ip_secondary.c
Sunday, November 29, 2009
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