> On Jul 22, 2020, at 6:31 AM, Michael Knill 
> <michael.kn...@ipcsolutions.com.au> wrote:
> 
> Hi Group
>  
> I have moved to a carrier that only provides a dynamic PPPoE address and if 
> you want a static address they add a /30 routed range.
> Just wondering how I configure this in Astlinux? Do I use EXTIP_ALIAS? How do 
> I use this address for outgoing Source NAT?

Hi Michael,

For all these years, I have not heard of such a PPPoE configuration.  Are you 
sure you need a static IP :-)

The EXTIP_ALIAS would not apply since that is for physical interfaces, not 
PPPoE.

Questions:
1) Is the /30 route completely different from the assigned dynamic /32 IPv4 ?

2) Does the PPPoE connection, via the underlying PPP connection, automatically 
add the /30 as a route and associated with the ppp0 interface ?  OR, is this a 
static route and address that needs to be manually added to ppp0 after the 
PPPoE connectioin is up ?
--
ip addr show dev ppp0

ip route show dev ppp0
--
(sanitize any public IPs)


AstLinux has a firewall Outbound SNAT plugin that will SNAT outbound traffic 
from select internal IPs/CIDRs, this may work for you.

The added problem here is since PPPoE can destroy and create the ppp0 
interface, any associated static routes and firewall rules will be lost on a 
PPPoE restart, so that needs to be kept in mind.

Lonnie





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