my outside nat interface e0 is configured to receive its address via dhcp, from the outside network. How do I configure an access list to allow the address assignment to make it back to the router? As long as I don't assign an inbound access list it is assigned and IP address.
Configuring the inbound list for UDP 67 and 68 works if the interface currently has an IP address, it does not work if the router is rebooted, or the interface command 'shut', then, 'no shut' is given, and it does not have a current IP address. perhaps a particular protocol id needs to be passed through the access list. Any other thoughts or ideas are appreciated.
The above configures IP address to which certain broadcast UDP packets are forwarded, by default it is disabled on the router.
The ip helper-address command sets the helper address to address,. The helper address should be the address of a host that can answer UDP requests from other hosts. The router sees these requests broadcast on a LAN interface and forwards them to the helper address (generally a unicast address) if one is defined. A helper is particularly useful for DHCP requests; without some kind of forwarding, DHCP requires you to have a seperate server on every subnet. By itself, this command forwards packets for the BOOTP (DHCP), DNS, TFTP, TACACS, TIME and also NetBIOS name and datagram services. The ip forward-protocol command can be used to forward additional UDP services.
Example of configuration on interface Ethernet0 to have a helper address:
> interface ethernet0
> ip address 10.10.1.2 255.255.255.0
> ip helper address 10.10.2.5
I hope this helps out on you issue, let me know how you get on.
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...