Yep its certainly a bit strange.
1) Yes completely different although the /30 is actually 4 useable addresses as
it's a PPP connection.
2) No I'm fairly certain that PPP can only allocate a single IP Address which
is the dynamic one. I would need to add the additional addresses to ppp0 once
its up.
Note this is a routed range so I think it could be assigned to internal devices
and/or Astlinux local interface with NAT used to determine the address that is
source NAT'd for external traffic.
Hmm may need to play with the SNAT plugin and let you know.
Regards
Michael Knill
On 22/7/20, 11:31 pm, "Lonnie Abelbeck" <li...@lonnie.abelbeck.com> wrote:
> 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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