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You can definitely send a dhcp-lease-time option asking for more
time. The server may choose not to honor it, though. It's possible
that the server will only renew for you when you're broadcasting your
request, or it may not be willing to renew at all - it may be
configured to force you to get a different IP address when your lease
runs out. I've had people ask me to hack the ISC server to do that.
A Win95 user might not notice this, because Win95 doesn't really use
any protocols with long-lasting TCP connections. A Win95 user who
didn't happen to be sitting in front of the machine when its address
expired might never notice that it had happened.
In order to get to the bottom of this, I'd suggest that you actually
set a really short lease time and then run the client with the -d flag
and record the output. Get a packet trace on another machine
connected to the same wire, if you can.
The dhcpd.conf file hack:
send dhcp-lease-time 300;
The dhclient invocation:
dhclient -d
The tcpdump command:
tcpdump -e -x -s 1500 udp port 67
Send me all the output, and I'll see if I can figure out what's
happening.
_MelloN_
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