IPv6 ND not working with interface ARP mode reply-only

RouterOS General
1

Hello all,

I have a problem with IPv6 ND (neighbour discovery) and interface configured in ARP mode reply-only.

Scenario:
RB433AH [ether2] ----- [eth] Windows client

RB433AH

  • tested ROS 5.7, 5.8

Windows client

  • tested Windows XP SP3, Windows 7
  • configuration on Windows XP is stateless IPv6 (only one supported mode for IPv6)

Problem description:
When I configure:

/interface ether2 set arp=reply-only

the ROS ND is not working - in the Windows XP I can see IPv6 IP address from range that is advertised from ROS, but I’m not able to ping ether2’s IPv6 IP address from the Windows XP client. I can’t see the Windows XP client in ROS IPv6/ND list. When I configure:

/interface ether2 set arp=enabled

everything is working correctly - the client is able to ping ether2’s IPv6 address, I’m able to see the Windows XP client in ROS IPv6/ND list.

Based on description of ND working, this advertisement should be done via ICMPv6 - http://wiki.mikrotik.com/wiki/Manual:IPv6/ND .

Do you see any misconfiguration in my screnario, please? On the same interface I’m running also IPv4, the ARP mode reply-only is working correctly. If you need more information or I should open ticket for this issue, please let me know.

Thank you

2

for IPv6 to work use arp=enabled or it can fail.

edit: it works as you expect, there is problem with addresses when ARP is not working for IPv6. It is known problem and we are working on it. It is not an easy fix unfortunately.

3

Thank you for information.

What is the estimated date for fixing this issue, please? - next ROS 5.9?

Thank you

4

at this moment cannot promise any ETA.

5

Ok, thank you for update, I wish you a good luck and I will be waiting for fixing the issue :slight_smile:

In case of testing release with fix of this bug, please let me know and I can test it, if it will be needed.

Thank you

6

test is trivial -change ARP, reboot and check if IPv6 traffic is passing at all, code behind this is not

7

http://forum.mikrotik.com/t/problems-with-ipv6-on-bridge-interface/51310/1

Same issue :frowning:

8

Yes, it seems that it is related to the same issue. Let’s hope that it will be solved :slight_smile:

9

The first tests shows that the issue with interface ARP mode reply-only and IPv6 stateless autoconfiguration is solved in ROS 5.12, let’s wait for a final release :slight_smile:

10

good to know it works for you. I do not think that code will change till release, at least in this part. Of course, if no problems are found