I found a bug with the 7.XX versions of RouterOS when trying to mount an l2tp session with some models of french SIM cards.
This is the error that we get when trying to mount the L2TP interface :
l2tp,ppp,info l2tp-backup: warning - assigned remote address X.X.X.X conflicts with peer address or local address, using 10.112.113.40
As I know, 10.112.113.40 is the APIPA address for mikrotik and I made sure that the IP address was not used with the PPPoE interface or any other one.
I precise that the default LTE interface is running well and allow us to reach internet.
As soon as we downgrade the RouterOS to a 6.XX version, that’s working well, is there someone who has encountered the same issue and found a fix for this ?
I have a similar problem on l2tp:
l2tp: warning - assigned remote address 80.XX.XX.XX conflicts with peer address or local address, using 10.XX.XX.XX
RouteOS 7.15
The issue is likely due to majority of MNOs using CGNAT … meaning that mobile devices receive some private IP (either RFC1918 or RFC6598) and then does NAT to public addresses for outgoing connections. And there’s not much a subscriber can do about it … except using tunelling solution which works across NAT.
I don’t think that’s the problem, indeed mobile devices receive private IP on the lte interface but that’s a normal comportment. As I said in my previous post, I manage to reach internet from the lte interface but I can’t set up the l2tp interface who’s supposed to get a public IP address from my radius server. As soon as I turn up the l2tp interface I’m starting to get the error, but when downgrading to 6.XX that’s working well, there is a software bug here.
I have the same problem with ros v7. I opened a support request on June 7 and still waiting. I provided access to a test router in version 7.16beta4 with the procedure to reproduce the problem.