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[SOLVED] manual DHCP request
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doublehp
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PostPosted: Mon Dec 24, 2012 3:31 am    Post subject: [SOLVED] manual DHCP request Reply with quote

Hello.

I want to perform a DHCP querry manually. I want to simulate a DHCP request to a specific DHCP server, but not use any of the returned values.

dhclient -n should theoretically do it using the ISC client, but in practice, the command does not work for me. So I need any alternative to do it. Netcat scripts are welcome. Never used it, no clue where to start. Other approches accepted.

I want to check the DNS. But not use them at once. The IP of DHCP server is fixed and known.

Thanks.
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Last edited by doublehp on Thu Jan 03, 2013 5:17 pm; edited 1 time in total
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Ant P.
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PostPosted: Mon Dec 24, 2012 3:43 am    Post subject: Reply with quote

dhcpcd has a "--test" option, which should do what you want.
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UberLord
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PostPosted: Thu Jan 03, 2013 12:43 pm    Post subject: Reply with quote

You don't generally do a full DHCP transaction to a specific server - the only time DHCP unicasts is during the RENEW phase.
Otherwise, as said above, dhcpcd --test should fill your needs.
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doublehp
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PostPosted: Thu Jan 03, 2013 5:17 pm    Post subject: Reply with quote

Yes, dhcpcd --test could do it, but on the machine where I need it, i can't install dhcpcd. I have found an other way to do it, via heavily altering the conf files /etc/dhcpcd.conf and friends.
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