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Mariusz Pekala wrote:

>I have two interfaces: eth0 - configured by dhcp server (not mine - I cannot 
>check its config and logs) 

Then there's unfortunately nothing you can do about the short lease
time.  The server should, however, be giving you back the same address
you had if it's available, leading me to believe that you may be on a
very busy network that's short on leases.  In such a case, you'd
probably also expect to see occasional failures to renew, if there
were no leases available at the moment.  That might explain some of
what you're seeing.

You may be a good candidate for a download manager that can resume
when you go down and come back on a different IP.

>I have ipchains set with rather restrictive policy: everything that I don't 
>need or I don't know is blocked (icmp is not blocked, incoming udp packets 
>from ports bootps:bootpc are allowed, every incoming tcp connection is 
>rejected). 

You'll find iptables much easier to deal with in this regard.  Not 
necessary to poke so many holes.

- -d

- -- 
David Talkington
http://www.spotnet.org

PGP key: http://www.prairienet.org/~dtalk/0xCA4C11AD.pgp

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