Iptables and Interface Names...

[Joshua Snyder]

I recently upgraded from 2.2.14 with ipchains to 2.4.14 and iptables
1.2.4.  I have been getting the following error messages when I specify an
interface.  

iptables -A firewall -i Serial0.1 -p tcp --dport 53 -j DROP
Warning: wierd character in interface `Serial0.1' (No aliases, :, ! or *).

I know that iptables doesn't work with aliases but this isn't an alias.
This interface is a Frame Relay hardware sub-interface (it's a pvc).
Linux treats this as a normal interface, not an alias.   

ip addr shows the following... (ip address's changed...)

27: Serial0.1: <BROADCAST,MULTICAST,NOARP,UP> mtu 1500 qdisc pfifo_fast qlen 50
    link/dlci
    inet 205.169.253.241/32 brd 205.169.253.241 scope global Serial0.1


Even though it produces an error message it still works.  Should I
concerned?  Also the period in the Interface name isn't listed as a "wierd
character" according to the error message, so should it even be
complaining?

			josh