Open IPv6 Issues / questions

Hi Ben, please see my answers inline below:

Ben said:

- will the fix for issue NUTM-7187 be included with 9.5?

 [BL]: The fix for NUTM-7187 is not included in this current UTM 9.5 beta version. We are actively working on the fix right now though, so as soon as we have a confirmed fix it will be included in a subsequent release.

- is there a fix in the works for IPv6 Connections where the WAN Port is supposed to use an address out of the delegated prefix? Currently users of such ISPs do not get any IPv6 address. (for esxample KPN netherlands)

[BL]: This should be supported today, unless the ISP is doing both stateless & stateful. Is that the case for you? If so, we are fixing that as part of NUTM-7187 as well.

- what about the ability to change/edit the UID for IPv6 Delegation Requests?

[BL]: Unfortunately this isn't part of this 9.5 release.

- what about long standing feature requests such as 6tunnel integration, lets encrypt - is that on the roadmap? Users, myself included had high hopes for 9.5 but this seems to be more than a maintance release.

[BL]: Lets Encrypt is on our current roadmap, but it's mainly planned as a WAF feature. As for 6tunnel integration, it's currently not planned for any specific release.

 

thank you in advance.

 

Hi Bobby,

Normally the ISPs router will then request /48 prefix and use a /64 from that prefix for the wan interface and a /64for the lan interface. So there are no other global ipv6 addresses than the ones from that /48.

On the Sophos UTM, in my case I will only receive a link local IPv6 address via PPPoE. Using a tcpdump I have verified the UTM is not sending out a prefix request after the PPPoE has been established. Is it waiting for a advertised IPv6 address for the WAN interface first before it will do this? Because in this case it will never get it... And thus a IPv6 prefix will never be requested.

If you want to have a look at my Sophos VM, or need some tcpdumps of the PPPoE setup let me know!

Rene

Thank you Ben, that is extremely helpful info! The developer working on the issue was suspecting & investigating this same area as well, so looks like we're on the right track.

Rene: Please check out the patch Ben sent you, and let us know if it resolves the PPPoE issue for you.

UTM stopped sending Rebinds sometime early yesterday, ipv6 prefix stopped working yesterday sometime after i last replied to this thread (it wasnt working this morning anymore)

i am leaving the machine in this state, think your support is still logged onto the machine. Thanks again for this open communication, its much appreciated. 

I provided Rene with the patch and waiting to hear back from him.

I installed the patch I received from ben, but it has not been solved.

gateway:/home/login # rpm -Uvh ep-ipv6-watchdog-9.40-2.gffa2228.i686.rpm
Preparing... ########################################### [100%]
 package ep-ipv6-watchdog-9.50-3.g64d8245.rb3.i686 (which is newer than ep-ipv6-watchdog-9.40-2.gffa2228.i686) is already installed
gateway:/home/login # rpm -Uvh --force ep-ipv6-watchdog-9.40-2.gffa2228.i686.rpm
Preparing... ########################################### [100%]
 1:ep-ipv6-watchdog ########################################### [100%]

gateway:/home/login # /var/mdw/scripts/ipv6_watchdog restart
Shutting down IPv6 Watchdog done
Starting IPv6 Watchdog done
gateway:/home/login # tailf /var/log/ipv6.log
2017:04:11-09:46:58 gateway ipv6_watchdog[4378]: Stopping IPv6 address watchdog
2017:04:11-09:46:59 gateway ipv6_watchdog[22269]: Starting IPv6 address watchdog
2017:04:11-09:47:08 gateway ipv6_watchdog[22269]: Start of monitoring interface ppp0(ifidx 7)
2017:04:11-09:47:08 gateway ipv6_watchdog[22269]: RA flags changed for interface ppp0(ifidx 7): NONE -> SENT,READY

I am not receiving a IPv6 prefix. After making a capture on the interface I do not see a DHCPv6 Prefix request. What I see is a router solicitation every 5 seconds but no reply to it.

Hi Rene,

From the debug logs you have pasted, it looks like the ppp0 interface hasn’t received any RA from the ISP end.

Unless an RA is received with the appropriate flags (M, O or A) set, dhclient6 will not be started for this interface on the UTM.

Please check if disabling and re-enabling the DSL interace on the UTM helps.

-Prakash

Hi Prakash,

That is correct. The ISP does not do RA i my case. If you want I can share the capture of the regular setup with the box provided by the ISP instead of the sophos. 
After setting up the PPPoE connection it should do a DHPCv6 request for the prefix immediately. No RA is received.

Regards,

René

Hi Rene,

I looked into the capture file you provided and found that the box provided by your ISP directly sends out DHCPv6 solicit messages with IA_PD option, immediately after PPP IPV6CP is successful. The box provided by your ISP is probably configured to always use DHCPv6 IA_PD when connecting to the server.

On the other hand, the Sophos UTM has a need to first do IPv6 Neighbor Discovery to understand if the server (ISP end) supports SLAAC or stateless/stateful DHCPv6. Based on the RA and prefix flags it receives from the server during IPv6 ND, it would then setup the dhclient6 appropriately to use SLAAC or DHCPv6 or both.

In the absence of ICMPv6 RAs, the current code doesn’t initiate stateful autoconfiguration by default. We will look into addressing this issue asap as a bug fix in a future release.

-Prakash

Thank Prakash. Really appreciate the response on the forum!

In this case no Neighbor Discovery is possible. I tried it, but no response from the ISP network. So best would be a statefull autoconfig as fallback when no RAs are received.

Thanks again! Can you keep me updated on the bug report?

Regards,

René

i realize there was easter holidays, but is there any ETA on the fix of the lost prefix? i am delaying a setup right now that would need it and thus trying to work a time table. Thank you in advance.

Hi Ben,

A "potential" fix should be available before EOD today (PST). Hope it works well this time... let us know how it goes.

-Prakash

thanks for the swift reply Prakash

Please feel free to install it on the sophos with the open ticket anytime. ill than copy it to my test machine aswell and report back here on both.

thanks for the swift reply Prakash

Please feel free to install it on the sophos with the open ticket anytime. ill than copy it to my test machine aswell and report back here on both.

I have installed the fix (/root/fix-2.1/ep-ipv6-watchdog-9.40-2.gce849c7.i686.rpm) on the UTM.

The ppp0 interface did get the prefix correctly.  Let us keep monitoring the behavior now...

Thanks,

Prakash

Hi Prakash,

Does this new version also solve my issue?

Regards,
René

Hi René,

Please get the latest fix (/root/fix-2.2/ep-ipv6-watchdog-9.40-4.gce64053.i686.rpm) from Ben.

It has the fix for your issue too. Let me know if it works for you.

In any case, please collect the ipv6.log and system.log files from /var/log and also provide packet captures if possible.

Thanks,

Prakash

Hi Prakash,

Good and bad news...

The good news is, I am now getting an IPv6 prefix! YAAY

The bad news. IPv6 traffic is not working yet :( 
In the interfaces overview I am not seeing my link local address anymore on the pppoe wan interface. This was shown before.

Log still shows I get it, but ifconfig does not show this local LL address.  
2017:04:19-19:41:55 gateway pppd-pppoe[27608]: local LL address fe80::3567:15be:c320:d03e
2017:04:19-19:41:55 gateway pppd-pppoe[27608]: remote LL address fe80::2a31:52ff:fe59:9fa6

I am also missing an IPv6 default route.

-- UPDATE
After reverting to the previous version I see the ipv6 LL address again in the interfaces overview, but it does not show up in ifconfig.

Using both versions I am able to ping the remote LL
# ping6 -I ppp0 fe80::2a31:52ff:fe59:9fa6
PING fe80::2a31:52ff:fe59:9fa6(fe80::2a31:52ff:fe59:9fa6) from fe80::8445:1d69:66c2:b895 ppp0: 56 data bytes
64 bytes from fe80::2a31:52ff:fe59:9fa6: icmp_seq=1 ttl=64 time=1.14 ms
64 bytes from fe80::2a31:52ff:fe59:9fa6: icmp_seq=2 ttl=64 time=1.08 ms

-- UPDATE2

After setting a default route connectivity works! :D
# route add -A inet6 default gw fe80::2a31:52ff:fe59:9fa6 dev ppp0

I also noticed the "Internet IPv6" network object is not bound to any interface.

René

Hi René,

Thanks for spending time verifying the fix and for your inputs.

FYI... A few other modules underwent IPv6 related fixes and code restructuring for 9.5 Beta (not just the ipv6_watchdog).

The problems you are seeing could be because of certain missing interdependencies (assuming you installed the latest 9.411 ipv6_watchdog fix over 9.5Beta).

If this is not the case, I will need to take a look at the packet capture (just before and after the pppoe interface is enabled) and also the logs from /var/log  to understand the problem in more detail. Would it be possible for you to provide us the same (via Sophos support maybe)?

However, it could be about a week or so before I can actually work on a fix again (sorry about that..)

Regards,

Prakash

i will test the patch with the 9.5 beta soon (tm), will report back on that also.

edit: test with 9.5 Beta, looking good so far.

Hi Prakash,

When referring to previous version in my last post I mean the previous patched persion. That showed the LL address, so i think it should work correclty in 9.5.

Regarding the missing default route. How is this generated in the watchdog script? Is it using the address of the RAs? In this case we don't have those and the default should point to the remote link local received via pppoe.

Thank you for all the work so far! If you are able to fix the default route creation I think my IPv6 is fully working! :)

Let me know if you still need some captures.

René