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Forums › 2degrees (including Slingshot, Orcon, Flip, Stuff Fibre, MyRepublic, 2talk and Vocus) › Anyone noticed v4 traffic not working on 2Degrees?
Ping

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#323721 6-Jan-2026 10:15
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Woke up this morning and found that HTTP(S) traffic on my 2Deg connection is no-longer working via IPv4 but v6 traffic is fine.

 

I am able to ping v4 addresses and resolve hostnames against v4 DNS server as well. Occasionally I'm able to bind a socket over HTTP/HTTPS to a remote web server but generally it fails (never get a SYN-ACK back)

 

No idea what would cause this strange behavior - no changes to router config on my end, just stopped working suddenly...

 

 

 

Anyone else noticing something similar?

 

 




Pat

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michaelmurfy
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  #3450479 7-Jan-2026 00:27
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Ping: Its regressed tonight and internet usage is super frustrating; Guess I'll have to try navigate through their tech-support hell again :|

 

The problem was finding anyone who knew what I was talking about - hence the churn to an ISP that doesn't use CG-NAT and was around the same price. But I do think it is CG-NAT Port Exhaustion.

 

Having a full public IP address beats CG-NAT anytime. Especially for those running services.

 

Linux: @ping or you can tag a 2degrees staff member in this thread

 

Remember this isn't official support. Sure there are 2degrees staff here but pinging them for every problem isn't ideal especially when this has happened quite a number of times now (from a quick search):

https://www.geekzone.co.nz/forums.asp?forumid=81&topicid=317547&page_no=1#3302235 

 

https://www.geekzone.co.nz/forums.asp?forumid=66&topicid=312833&page_no=2#3233704 

 

https://www.geekzone.co.nz/forums.asp?forumid=49&topicid=320401 

 

It's more of a problem if you're running torrent software or anything that uses a tonne of ports - which my example was.




Michael Murphy | https://murfy.nz
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