Comments on: Cisco ASA 5505 and DHCP Client Problems http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/ Security Stories and Help with Network Documentation Thu, 22 Jul 2010 01:25:49 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Steve http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/comment-page-1/#comment-41698 Steve Tue, 18 Nov 2008 00:53:48 +0000 http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/#comment-41698 I'm having a similar problem. I have a verizon dsl modem set to bridged mode and a ASA 5505. Whenever the dsl modem gets rebooted, I have to click on "renew dhcp lease" in ASDM on the ASA. Once I renew dhcp then internet is back up. How come the ASA doesnt renew itself whenever the modem reboots? The ASA is running ver. 7.2 (3). I’m having a similar problem. I have a verizon dsl modem set to bridged mode and a ASA 5505. Whenever the dsl modem gets rebooted, I have to click on “renew dhcp lease” in ASDM on the ASA. Once I renew dhcp then internet is back up. How come the ASA doesnt renew itself whenever the modem reboots? The ASA is running ver. 7.2 (3).

]]> By: ERic http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/comment-page-1/#comment-38844 ERic Tue, 09 Sep 2008 01:26:43 +0000 http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/#comment-38844 Problem I've had with the 5505 is that when hooked to DSL and the ADSL set to bridging and the 5505 using a static IP it won't communicate with anything. When I set the modem(DSL) with a static IP and set the 5505 to use DHCP on the outside interface, bang it works like a champ. Don't know why it won't communicate in static mode like the VPN 3002 clients do. Any help or pointers would be appreciated. Eric Problem I’ve had with the 5505 is that when hooked to DSL and the ADSL set to bridging and the 5505 using a static IP it won’t communicate with anything. When I set the modem(DSL) with a static IP and set the 5505 to use DHCP on the outside interface, bang it works like a champ. Don’t know why it won’t communicate in static mode like the VPN 3002 clients do. Any help or pointers would be appreciated.

Eric

]]> By: Cisco ASA 5500 and the Hunt for the Lost Gateway - Networking http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/comment-page-1/#comment-23817 Cisco ASA 5500 and the Hunt for the Lost Gateway - Networking Wed, 14 Nov 2007 21:43:32 +0000 http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/#comment-23817 [...] my ISP wasn’t following the RFC for DHCP to the result that my ASA 5505 couldn’t get a DHCP lease, after talking with Cisco they quickly sent me a patch with a workaround and later published a new [...] [...] my ISP wasn’t following the RFC for DHCP to the result that my ASA 5505 couldn’t get a DHCP lease, after talking with Cisco they quickly sent me a patch with a workaround and later published a new [...]

]]> By: Patrick Ogenstad http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/comment-page-1/#comment-23704 Patrick Ogenstad Mon, 12 Nov 2007 07:30:07 +0000 http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/#comment-23704 James: I never had any problems with the DHCP server in the ASA, it was the DHCP client. The problem was really that my ISP wasn't following the RFC for DHCP. I'm using a Cisco ASA 5505 as a DHCP server for my home network, in a corporate environment I usually use a Windows Server acting as DHCP. However the ASA 5500 should probably suit your needs when it comes to DHCP. Regardless of you DHCP requirements it's a great firewall. James: I never had any problems with the DHCP server in the ASA, it was the DHCP client. The problem was really that my ISP wasn’t following the RFC for DHCP. I’m using a Cisco ASA 5505 as a DHCP server for my home network, in a corporate environment I usually use a Windows Server acting as DHCP. However the ASA 5500 should probably suit your needs when it comes to DHCP. Regardless of you DHCP requirements it’s a great firewall.

]]> By: James T http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/comment-page-1/#comment-23699 James T Mon, 12 Nov 2007 02:46:47 +0000 http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/#comment-23699 I am looking at buying one of these and DHCP is something I'm concerned about. Now that you've had some time with it, does the 5500 make act as a good DHCP server for your LAN? I am looking at buying one of these and DHCP is something I’m concerned about. Now that you’ve had some time with it, does the 5500 make act as a good DHCP server for your LAN?

]]> By: Patrick Ogenstad http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/comment-page-1/#comment-21958 Patrick Ogenstad Sat, 29 Sep 2007 20:03:59 +0000 http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/#comment-21958 Hi Ralph, No problem, glad to hear that it worked out for you! Hi Ralph,

No problem, glad to hear that it worked out for you!

]]> By: Ralph http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/comment-page-1/#comment-21916 Ralph Fri, 28 Sep 2007 18:01:50 +0000 http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/#comment-21916 This post saved me 2 days of frustration and replacing a unit that I did not have to in the first place. Thank you for the tip “ip address dhcp client-id fastethernet 0″ This post saved me 2 days of frustration and replacing a unit that I did not have to in the first place. Thank you for the tip “ip address dhcp client-id fastethernet 0″

]]> By: Patrick Ogenstad http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/comment-page-1/#comment-20941 Patrick Ogenstad Mon, 03 Sep 2007 18:51:56 +0000 http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/#comment-20941 You shouldn't have any problems using a 1811 to your purposes, if VZ FiOS has any problems with DHCP you can just use the command ip address dhcp client-id fastethernet 0 Check out this page for some brief information of the security features of the 1800 series: http://www.cisco.com/application/pdf/en/us/guest/products/ps5854/c1650/cdccont_0900aecd80169b0a.pdf You shouldn’t have any problems using a 1811 to your purposes, if VZ FiOS has any problems with DHCP you can just use the command

ip address dhcp client-id fastethernet 0

Check out this page for some brief information of the security features of the 1800 series: http://www.cisco.com/application/pdf/en/us/guest/products/ps5854/c1650/cdccont_0900aecd80169b0a.pdf

]]> By: hackez http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/comment-page-1/#comment-20669 hackez Sun, 26 Aug 2007 20:58:16 +0000 http://ogenstad.net/2007/03/14/cisco-asa-5505-and-dhcp-client-problems/#comment-20669 Hello, I wanted to know more information about the cisco 1811. Will be able to do DHCP from VZ FiOS? Also does it have port security? I just got one for $560 off ebay. I only touched 2600's at school while still doing my CCNA. Hello, I wanted to know more information about the cisco 1811. Will be able to do DHCP from VZ FiOS? Also does it have port security? I just got one for $560 off ebay. I only touched 2600’s at school while still doing my CCNA.

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