I am running a Cisco 1605R as a VPN Client. The 1605R is running 12.2.8T4 IOS with IPSec. We are using this in a Router to Router VPN to a remote office. We can only get Cable Modem Access to this site and have been using the DHCP feature to get the Ethernet address. The router has been up and flawless for months and just went down, for some reason DHCP fails to aquire a new address from the cable providers DHCP server. A Windows desktop will get an address but its slow. I called in a trouble ticket to the provider but they say its the router. I upgraded to the latest 12.2 IOS code and the router still will not receive an address. After running a detailed Debug for a while it seems the DHCP process breaks at the offer stage and does not accept the address... Any suggestions would be great.
After hours of debugging I have found my own fix, I just wanted to post the solution here for those of you that may be trying to use the DHCP function over a cable modem network. What I found was that a Windows workstation was able to receive an addres with no trouble, but a router running DHCP to gain an address from the provider was not. The trouble shows up in the debug, the router does not seem to want to accept the address so DHCP will break at the accept stage. Cisco by default will use a 255.255.255.255 broadcast address for any ethernet interface (Use a show ip int) command. Windows uses a 0.0.0.0 address. So if you change the ip broadcast address to 0.0.0.0 the router will complete the DHCP sequence. As well route-caching must be turned off on the DHCP interface.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.