dhclient: lease renewal woes

[Mr Dash Four]

> ok, what you have is:
>
> CMTS --- CM --- Linux Firewall --- Other PC
>
> The CM is running in Bridge mode and is actually not the DHCP server. 
> The DHCP server is behind the CMTS (that is the counter to the CM).
What is "CMTS"? Apart from that and the fact that "Other PC" means 6 
different interfaces serving my other 6 (internal) networks, you seems 
to be spot on.

> Yes, the address you get on the linux firewall will occasionally 
> change. But, there is no big reason for the "Other PC" to change, as 
> you can make that invisible to them.
Just to make it absolutely clear - the "Other PCs" addresses are of no 
concern to me at all - as they form part of my (internal) networks I 
have full control over what happens there. The only problem I have is 
with the renewal of the public IP address given by the provider, that's all.