is it possible in iptables to have more then 1 external interfaces ?
Short answer. Yes.
Longer answer. Netfilter do not have notition of external or internal interface. They are all the same. You build firewall rules according to which interfaces you consider as internal, external, and what kind of traffic are you going to allow on them. If you want, you might be just as restrictive on internal interfaces as on external.
If you are using some software that generates firewall rules for you, than that software might have limitation of allowing you to tag only one interface as external. Again, this is not limitation imposed by Netfilter. For Netfilter, there's no such thing as internal or external interface. Netfilter knows only about "interfaces", it doesn't know what you consider them to be.
-- Aleksandar Milivojevic <amilivojevic@xxxxxx> Pollard Banknote Limited Systems Administrator 1499 Buffalo Place Tel: (204) 474-2323 ext 276 Winnipeg, MB R3T 1L7
