wan only getting /128 from comast business

[hescominsoon]

just an fyi with my udmp i get the /55 i am asking for.  with opnsense the wan interface only gets a /127.  I have tried enabling prefix hints and also tried ipv4 connectivity.  NO avail.  Any ideas?

[franco]

Can you be more specific? /127 is really weid considering the smallest subnet size must be /64.


Cheers,
Franco

[hescominsoon]

Sorry /128.   It's pretty self-explanatory. When they open sense firewall gets an IP address. It gets a/ 128 instead of a/55. Don't know why. If I put my unify UDM pro back it gets the/ 55 and I can get IPv6 subnets to all my other VLANs.

[marjohn56]

Have you tried requesting a prefix only?

[franco]

Sorry /128.   It's pretty self-explanatory.

It's really not, especially when you have to correct the only (unverifiable) fact in your report.

ifconfig output helps, logs help, OPNsense version helps (this is the general discussion forum, not one for a version series), a screenshot of your WAN settings also helps.


Cheers,
Franco

[marjohn56]

If that /128 is on the WAN then it matters not. It should work without a GUA on the WAN. I'd be more interested in seeing the log entries or dhcp6c.

[marjohn56]

Thinking... it might be as simple as MAC & DUID cloning.

[hescominsoon]

I went looking through noted i kept about firewalls and bsd...and found something i had forgottena bout:

I have tried three different machines with both pf and OPNSense.  all of them have shown this behavior.  I had a netgear gogabit modem but while ipv6 worked as expected I would randomly loose connectivity between 60-300 seconds for one second.  which nic was used did not affect things on any machine.  I currently have an arris 6141 modem.  nothing bsd based i have tried opn/pf sense has worked correctly with it in terms of ipv6.  I am wondering if there is some weird compatibility issue i am hitting here....

[marjohn56]

Hence my comment about looking at the dhcp6c logs. Go to Interfaces->Settings and set Ipv6 DHCP log level to Info. Reboot.


Once its back up, go to system->log files->general and filter on dhcp6c. That should give you a clue or you can post the logs here and we'll take a look.

[marjohn56]

There is something else to try. Takes a bit more work but I have used it in the past to find out why one device works and another doesn't. You'll need a managed switch to do it properly, one that allows port mirroring. You can then use wireshark to capture the traffic to and from the ISP <> modem/opnsense and see what the difference is. If you want to do that and PM me the packet captures for both working and non working I can take a look and try and work out the problem.

[chemlud]

...You'll need a managed switch to do it properly, one that allows port mirroring. ...

...or an old hub (if you know what I mean ;-) )