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I've a Solaris 8 ( Intel ) and I've 2 NIC in that. I'm using it as a mail relay host. Now i've configured IP for each of them.
ifconfig -a o/p shows both the interface with IP.
Now my question is, can i have a method by which i can have the second interface taking up, when the first is down. Both the interfaces are not connected.I hope i'm not confusing
Yes, that is confusing - if it's isn't connected (the second interface) it won't work
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...I've only 1 network cable going into the Box and that's to NIC1. I've 2 ISP lines, one is 2Mbps and the other 1Mbps. My requirement is like this..When the link for ISP1 is down, NIC2 should take over and use the ISP2 link so that the mail flow is not affected.
It won't do anything unless it's connected
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If it is possible, where will the configuration go into? ?Is it Sendmail(I've no idea about sendmail). Or is it something else...
Not sendmail. You are looking for something like cluster software which allows for HA (high availability). You could write some scripts to switch your main IP over to the second interface if the first is down, but the thing you really need to think about ...
will the first interface fail? Is this more likely than the computer crashing? Or getting really slow because of the amount of email being sent/received? You would be better off getting another computer, installing Solaris 8, configuring another sendmail, and setting your MX records in DNS to have both servers. Then you are redunant (in cpu, disks, and connections - make sure not to use the same ups on both servers) and if one interface (server, disk, ups) fails, you won't be completely down.
