Re: Alias reference in iptables

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Hello,

Cloves Pereira Costa Jr a écrit :

I'm configuring a linux router and i will create some alias in the LAN
interface (eth1) for a network 10.1.1.0/27. For example:
eth1 --> 10.1.1.33
eth1:0 --> 10.1.1.65
eth1:1 --> 10.1.1.97
...

My question is: I can use in iptables rules the reference to the alias
interfaces (eth1:0, eth1:1, ...)

No. IP aliases are just extra addresses, not interfaces. IP aliases are some kind of old IPv4-specific legacy used by ifconfig. They are not required to add extra IPv4 addresses to an interface and do not even exist in IPv6.

or I can only refer to the main interface (eth1)?

Yes. Same with routing : you won't find any alias name in the routing table.
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