ASA 5505 release DHCP lease

Unanswered Question
Aug 25th, 2008

How can I release DHCP on external interface? It has obtained an IP from ISP that they have decided don't want me to have, so have to release address so can obtain a new IP. I keep getting the same IP back.

I have this problem too.
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Farrukh Haroon Tue, 08/26/2008 - 06:14

Try changing the mac-address of the interface and see if that helps.



stevew295 Tue, 08/26/2008 - 06:59

Thanks, I set to static, and gave it the 'new' IP (x.x.x.40, (using ASDM), save, then set back to DHCP, but it always grabs the 'old' IP (x.x.x.241). The ISP is reserving x.x.x.40 for this MAC address, another possible problem is that I didn't set the DHCP originally to 'Mac address', but rather left it at default of 'cisco-MAC-interfacename-host which is possibly why not getting the proper address assigned from ISP. But, when I set to static, and then switch back to DHCP, I check the "MAC address" but it still uses the 'cisco-MAC-interfacename-host'.

Farrukh Haroon Tue, 08/26/2008 - 07:00

Yes since the ISP has mapped it you need to change the mac-address of the inteface via the command line.



stevew295 Tue, 08/26/2008 - 14:11

Thanks, I double checked with my ISP, and they had not removed an earlier test computer's MAC address that I had setup (to try and resolve another issue), so in effect there were two MAC address bound. The ISP removed the old MAC address, which cured my problem.



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