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23.1 Legacy Series / Swisscom IPv6 via 6rd not working for a few months
« on: February 13, 2023, 06:53:02 pm »
Hello everyone,
I had been successfully using 6rd on my Swisscom VDSL2 line for more than a year, running OPNsense on an PCengines APU box with a Zyxel router used a plain modem, with OPNsense taking care of all things IP.
Sometimes around the last few months of 2022, I noticed that IPv6 stopped working after an update of OPNsense, but had no time to troubleshoot the issue.
A few more updates have happened, including 23.1_6 which I am now running, but it still looks like 6rd does not seem to work. Now I am taking some time to try and understand where the issue lies.
A couple of packet captures on the WAN interface igb0 port did not show any incoming traffic from the 6rd border relay, whereby the simple ping6 traffic to www.google.com would be normally visible, encapsulated into 6rd with destination the Swisscom 6rd border gateway.
Capturing traffic on wan_stf also shows the IPv6 traffic, of course before the 6rd encapsulation, with only outgoing ping6 traffic.
Please note that this is IPv6 originating from the OPNsense box via the shell CLI.
A quick ifconfig shows this configuration for the wan_stf interface:
wan_stf: flags=4041<UP,RUNNING,LINK2> metric 0 mtu 1452
description: WAN (wan)
inet6 2a02:1205:xxxx:xxxx:: prefixlen 28
groups: stf
v4net xx.xxx.xxx.xx/0 -> tv4br 193.5.29.1
nd6 options=101<PERFORMNUD,NO_DAD>
Can anyone comment on what might be the issue?
I have noticed a few mentions of 6rd in the last few releases, could there be any regression bug that I have hit?
Is there any more detailed way to troubleshoot the issue? I am definitely keen to find what caused the issue, as a few months ago things were working fine on my whole LAN with IPv6 thru 6rd on my OPNsense box.
Many thanks,
Luca
I had been successfully using 6rd on my Swisscom VDSL2 line for more than a year, running OPNsense on an PCengines APU box with a Zyxel router used a plain modem, with OPNsense taking care of all things IP.
Sometimes around the last few months of 2022, I noticed that IPv6 stopped working after an update of OPNsense, but had no time to troubleshoot the issue.
A few more updates have happened, including 23.1_6 which I am now running, but it still looks like 6rd does not seem to work. Now I am taking some time to try and understand where the issue lies.
A couple of packet captures on the WAN interface igb0 port did not show any incoming traffic from the 6rd border relay, whereby the simple ping6 traffic to www.google.com would be normally visible, encapsulated into 6rd with destination the Swisscom 6rd border gateway.
Capturing traffic on wan_stf also shows the IPv6 traffic, of course before the 6rd encapsulation, with only outgoing ping6 traffic.
Please note that this is IPv6 originating from the OPNsense box via the shell CLI.
A quick ifconfig shows this configuration for the wan_stf interface:
wan_stf: flags=4041<UP,RUNNING,LINK2> metric 0 mtu 1452
description: WAN (wan)
inet6 2a02:1205:xxxx:xxxx:: prefixlen 28
groups: stf
v4net xx.xxx.xxx.xx/0 -> tv4br 193.5.29.1
nd6 options=101<PERFORMNUD,NO_DAD>
Can anyone comment on what might be the issue?
I have noticed a few mentions of 6rd in the last few releases, could there be any regression bug that I have hit?
Is there any more detailed way to troubleshoot the issue? I am definitely keen to find what caused the issue, as a few months ago things were working fine on my whole LAN with IPv6 thru 6rd on my OPNsense box.
Many thanks,
Luca