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ASA interrupt the DHCP service

Cisco Router, Firewall, VPN, SDM, ASA and Switch

ASA interrupt the DHCP service

Postby chicagotech » Fri Jan 04, 2008 4:26 pm

A consultant setup a PIX 515E for one of our clients. The PIX connects to Cisco switch 3548 XL and works fine. The client just bought another ASA 5510 and they connected it to 3560G. It seems OK at beginning, but next day, some computers that need to renew the IP addresses, could not receive the IP from the DHCP. Other computer without renewing IP work as normal.

Since they could not reach the Cisco consultant, they called me for help (I setup windows server for them). I asked them to disconnect the ASA from the switch, then those computers work now. The following are the ports' settings on the both ports PIX and ASA connect to.

PIX to 3548:
interface FastEthernet0/8
switchport trunk encapsulation dot1q
switchport mode trunk

ASA to 3560G:
interface GigabitEthernet0/48

Can I assume the problem is the ASA connect to 1GB port? If yes, they should configure the speed to 100MB on the 3560G or connect ASA to 3548. Can some one confirm that? Thanks.
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