Hi,
yes, I need redundancy. when an line adsl come down all traffic go to
other line adsl. I couldn't have done this on linux machine. if you
has any how to about please post here.
How do you want to do that???
If you have two connections then you have two external IP-s...
If one goes down then you can not simply use the other one...
Just think about these steps:
In normal connection:
1. a local host (A - 192.168.1.1) sends a packet from LAN to an external
host (C - 8.8.8.8)
2. the firewall applies source NAT to the packet and sends it out as if
it were coming from the firewall's first external IP (B1 - 1.1.1.1)
3. C sends back a reply to B1
4. B1 forwards it with destination NAT to A.
5. go to step 1. or close the connection
If the line goes down between step 2 and step 3 then the reply packet
will never get back to B1 and A (because the line is down) !!!
If the line goes down after step 4 then you can send it out on the
second extrenal IP (B2 - 2.2.2.2) but C will see it as a NEW connection !!!
So I think that your request is impossible on IP level.
However you can use a proxy or a mail server, etc. etc. etc.
Swifty
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