Hi Michael,

Are you saying the ISP is providing both DHCP and Static IPs for your public 
WAN address(es) using the same routed subnet?

My business DOCSIS cable modem ISP provides either a DHCP or a Static IP public 
WAN address, but not both at the same time for the same interface.  Basically 
because the DHCP addresses are routed in a different public subnet versus the 
Static addresses.

On the other hand, if only DHCP is used for the public WAN address, then to 
admin your bridge modem using a static private address should work without any 
extra effort.

Again in my example, the cable modem will accept HTTPS connections to 
192.168.100.1, provided 192.168.100.1 is routed via the default route over the 
WAN path, the modem's web interface will appear.  Though if you defined a local 
private 192.168.100.1/24 LAN network or block RFC1918 egress traffic, the 
modem's web interface will be blocked.

Lonnie



> On Nov 9, 2021, at 10:03 PM, Michael Knill 
> <michael.kn...@ipcsolutions.com.au> wrote:
> 
> We are now using a new internet provider that uses IPoE rather than PPPoE 
> which is nice.
> Just wondering if its possible to have the WAN interface as both DHCP and 
> also a secondary static IP Address to connect to the bridge modem.
> I have this set up with PPPoE but as it's a separate interface its easy to do.
>  
> Regards
>  
> Michael Knill
> Managing Director
>  
> D: +61 2 6189 1360
> P: +61 2 6140 4656
> E: michael.kn...@ipcsolutions.com.au
> W: ipcsolutions.com.au
>  
>  <image001.png>
> Smarter Business Communications
>  
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