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metabubble

Member

Registered: 2020-08-07

Posts: 16

IPv6 goes down after a while, restarting NetworkManager.service helps

Hi,

My IPv6 Setup works flawlessly on my windows machine and on Android and iOS devices. I am using NetworkManager on my laptop and I have this issue, where (only at home) IPv6 seems to stop working. I still have an IPv6 address, but

$ ping ipv6.google.com
ping: connect: The network can't be reached (translated from German)

This issue does not happen on any other IPv6 networks, which are SLAAC or DHCPv6-stateless - I tried both settings on my router but that won't change anything. IPv6 settings in NetworkManager are also identical.

I am at my wit's end, and I also don't know how to go about debugging this issue. Any help how to debug this problem is greatly appreciated.

fukawi2

Ex-Administratorino

From: .vic.au

Registered: 2007-09-28

Posts: 6,231

Website

Re: IPv6 goes down after a while, restarting NetworkManager.service helps

IPv6 settings in NetworkManager are also identical.

I am at my wit's end, and I also don't know how to go about debugging this issue.

Perhaps you could share some of those configuration details, otherwise we're just stabbing in the dark.

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BlueHackers // fscanary // resticctl

metabubble

Member

Registered: 2020-08-07

Posts: 16

Re: IPv6 goes down after a while, restarting NetworkManager.service helps

Current NetworkManager configs are:

/etc/NetworkManager/system-connections # cat Interdimensional\ Cable.nmconnection 
[connection]
id=Interdimensional Cable
uuid=2b9bbc21-df67-4589-ac6c-7ec6c8356b9a
type=wifi
interface-name=wlp3s0
permissions=
timestamp=1597707869

[wifi]
mac-address-blacklist=
mode=infrastructure
seen-bssids=28:80:88:nn:nn:nn;28:80:88:mm:mm:mm;
ssid=Interdimensional Cable

[wifi-security]
key-mgmt=wpa-psk
psk=xxxxxxxxxxxxxxxxxx

[ipv4]
dns=1.1.1.1;8.8.8.8;
dns-search=
method=auto

[ipv6]
addr-gen-mode=stable-privacy
dns-search=
ip6-privacy=0
method=auto

[proxy]

/etc/NetworkManager/conf.d # cat dhcp-client.conf 
#[main]
#dhcp=dhclient #disabled because it didn't change anything

Installed and picked my network in nm. I have not touched any other network settings from install, used NetworkManager from first boot.

fukawi2

Ex-Administratorino

From: .vic.au

Registered: 2007-09-28

Posts: 6,231

Website

Re: IPv6 goes down after a while, restarting NetworkManager.service helps

I'm not sure exactly how NM works, but could it be a delay caused by the interval of RA's on your network? If NM doesn't send a RS when it connects, then you won't get an address until the next RA.

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BlueHackers // fscanary // resticctl

metabubble

Member

Registered: 2020-08-07

Posts: 16

Re: IPv6 goes down after a while, restarting NetworkManager.service helps

When NM connects, I usually have an IPv6, it just stops working after a while.

merlock

Member

Registered: 2018-10-30

Posts: 258

Re: IPv6 goes down after a while, restarting NetworkManager.service helps

When NM connects, I usually have an IPv6, it just stops working after a while.

I don't use NM (dhcpcd), occasionally I'll get the same thing.  A look thru the journal found a dhcpcd entry:

Aug 13 19:00:22 Jammin1 dhcpcd[1362920]: eth0: part of a Router Advertisement expired

Restarting dhcpcd works for awhile, then the above message again.

I don't know why, but the issue started with an ISP (Cox) reboot of my cable modem around the same time frame (WAN IPv4 address changed, IPv6 /64 didn't).  Again, I don't know why, but my router doesn't particularly like when Cox does this.

A reboot of the router cleared the issue.

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