I'm getting close on my email server (using fetchmail, postfix,
procmail, ipopd (and maybe later imapd) -- in fact, if you see this it
came from my Windows box via the Linux email server. ;-)
But, I have some bugs to work out yet, and some questions:
Questions:
1. Anybody know a good way to detect that a network link is active?
Background:
My connection to the Internet is via a dial up on another box (Dos, as a
matter of fact.) I would like to set up a cron job (and script) to do
something like the following:
* Confirm the connection to my ISP is up (ping him, check for
success?)
* If no: wake it up (ping it), and after so many tries, quit and give
a message somewhere (and if it wakes up, proceed to the if yes)
* If yes:
* Run fetchmail to get mail
* Run sendmail -q to kick the queue and send any outgoing mail
(I've set defer_transports=SMTP)
The reason I want to make sure the link is up before I kick the queue is
so that the "exponential backoff" doesn't go into effect and result in
outgoing messages sitting in the server for long periods of time (or
even getting "failure to deliver" "bounces" from my own server).
Is that an unrealistic concern? Is there a better way to deal with it?
Randy Kramer
Aside: For a while, every time someone mentioned "ifup" it sounded like
just what I needed. I now realize that it is a command (bring the
interface up) rather than a test (if the interface is up, do ...)
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