IPv6 dropping on 2degrees with third party routers

Forums › LAN (ethernet/Wifi/routers/Bluetooth) › IPv6 dropping on 2degrees with third party routers

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vulcannz

436 posts

Ultimate Geek
Inactive user

#2138452 3-Dec-2018 11:51

I don't think they do DHCPv6 IA_NA as I've capture the DHCPV6 packets and they do not assign an address.

I've gone back to Sonicwall as it is not autonomously assigning itself an address and as far as I can tell it should do. Unless my internal subnets are choking it (e.g /56 PD on WAN overlaps with internal /64s) - which may be the case. Maybe someone more well versed in IPv6 subnets can clarify for me. In v4 if I had my WAN as 10.0.0.0/16, I could not have my LAN as 10.0.1.0/24 - how does this work when DHCPv6 issues you a /56 on your WAN but you want to cut that into /64 chunks internally?

dfnt

1511 posts

Uber Geek

Lifetime subscriber

#2138533 3-Dec-2018 12:26

Yeah they don't do IA_NA

Your sonicwall should use a link local address on the WAN interface? At least that's how it works with the EdgeRouter

Then it's /56 PD with the LAN subnets being /64's, this is using SLAAC:

router# show interfaces ethernet eth0 vif 10 pppoe
pppoe 0 {
default-route auto
dhcpv6-pd {
pd 0 {
interface eth1 {
host-address ::1
no-dns
prefix-id :0
service slaac
}
prefix-length 56
}
prefix-only
rapid-commit enable
ipv6 {
dup-addr-detect-transmits 1
enable {
}
}

vulcannz

436 posts

Ultimate Geek
Inactive user

#2139288 4-Dec-2018 15:07

Yeah it works fine in DHCP using the LL side for routing. But because I have no WAN IP it sucks if I want to diagnostics and use features like WAN LB/SD-WAN.

fe31nz

1228 posts

Uber Geek

#2139476 4-Dec-2018 23:45

I have just had this problem occur with my EdgerRouter Lite 3. I am running v1.10.5 firmware, and have static IP address assignments from 2Degrees. I have the ERL doing a DHCP-PD request to the 2D Juniper, but it does not do anything with the delegated prefix as all my IPv6 address assignments on my network are using my static prefix.

I had noticed that opening Geekzone pages was taking ages, so I checked if I could ping any IPv6 sites on the Internet and none of them worked. So I ran tshark on my ERL and captured the DHCPv6 packets as I issued two commands to the ERL: "release dhcpv6-pd interface pppoe0" and "renew dhcpv6-pd interface pppoe0". After that, IPv6 was working again. I am working my way through the captured packets to see if I can work out what the problem was. This will take a while as I have to read the relevant bits of RFC 8415 first as I have never really looked at the contents of DHCPv6 packets before. But in the mean time, if anyone else wants to look at the capture, I have put it on my web server on a blind URL:

http://www.jsw.gen.nz/erl/pppoe0-release-renew.pcap

michaelmurfy

meow
13240 posts

Uber Geek

Moderator

ID Verified

Trusted

Lifetime subscriber

#2139480 5-Dec-2018 00:24

I think I'm going to lock this now putting it as an issue with Edgerouters and IPv6 on them in general. The other routers that were posted here are simply configuration issues. The fact is, IPv6 works with the 2degrees, official, supported router 100% fine so there is no fault here, only a fault with EdgeOS.

Since implementing my dodgy script here is the timestamps of when IPv6 disconnects happened (5mins when the cron job runs):

Sun Nov 25 11:35:11 UTC 2018: IPv6 dropped. Running resetv6.sh on router
Mon Dec 3 09:50:11 UTC 2018: IPv6 dropped. Running resetv6.sh on router
Mon Dec 3 19:05:11 UTC 2018: IPv6 dropped. Running resetv6.sh on router
Tue Dec 4 07:20:11 UTC 2018: IPv6 dropped. Running resetv6.sh on router
Tue Dec 4 07:45:11 UTC 2018: IPv6 dropped. Running resetv6.sh on router

@NickMack if those times coincide with any changes going on we may have our answer but really we should be posting on the Ubiquiti forums for a fix in v2.00. I note that on the forums there are many occurrences with this happening with other ISP's. I'm hoping with the work that is being done with v2.00 of EdgeOS this will get fixed.

Locked.

Michael Murphy | https://murfy.nz
Referral Links: Quic Broadband (use R122101E7CV7Q for free setup)

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Eitsop

583 posts

Ultimate Geek

ID Verified

#2141681 8-Dec-2018 17:02

I fixed my pfsense problem with ipv6 by
Setting MTU 1492 MSS 1452

michaelmurfy

meow
13240 posts

Uber Geek

Moderator

ID Verified

Trusted

Lifetime subscriber

#2141684 8-Dec-2018 17:15

attewell: I fixed my pfsense problem with ipv6 by
Setting MTU 1492 MSS 1452

I don't think that is it - 2degrees support full 1500 byte MTU.

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Eitsop

583 posts

Ultimate Geek

ID Verified

#2141696 8-Dec-2018 17:49

Worth a tru. I tried MTU 1500 MSS blank didn’t work
Left both blank and it self set to 1492

When I set MTU 1492 and MSS 1452. My problems resolved

Eitsop

583 posts

Ultimate Geek

ID Verified

#2142371 10-Dec-2018 10:40

Actually 1500 MTU works.. but more specifically when MSS is set at 1460

So I think key is setting MSS

Eitsop

583 posts

Ultimate Geek

ID Verified

#2143570 11-Dec-2018 20:08

Doh, last update.. I tried 1500 MTU, 1460 MSS.. a day later ipv6 failed..

Back to 1492 MTU & 1452 MSS

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