Internet service changed yesterday to IPv4 only... Why?

ericJ7 · 2025-06-18T17:07:41+00:00

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ericJ7

I noticed some unexpected changes in my Internet service yesterday morning, and have not found any reasons. My Connect-600 / Internet-50 service has been running with a Connect-Box_1 for several years with IPv4+IPv6 . But yesterday the box restarted, and since then I have only IPv4 DHCP to my Asus WiFi-router.

Here are the current details from the Compal unit:

Hardware version: 5.01
Software version: LG-RDK_CH7465LG-NCIP-6.18-2406.5.2-NOSH
Cable MAC address: 90:5C:44:E7:A0:XX
Cable modem s/n: DEAP704205XX
System up time: 0day(s)8h:11m:54s
Network access: Allowed
MAC address: 90:5C:44:E7:A0:XX
IPv4 address: 77.57.166.XX
Default gateway: 77.57.166.1
IPv4 DNS servers: 62.2.24.158, 62.2.17.61

Previously I would get both IPv4 & IPv6 via DHCP to my downstream Asus WiFi-router, like this: (Feb.2025)

“ip”: “31.10.169.46”,
“hostname”: “31-10-169-46.cgn.dynamic.upc.ch”,
“org”: “AS6730 Sunrise GmbH”
inet6 2a02:aa10:627e:9f00::9b3/128 scope global dynamic noprefixroute
inet6 2a02:aa10:627e:9f00:be18:16:f0d4:4778/64 scope global temporary dynamic
DNS-Server: 2a02:aa10:627e:9f00::68
( 0.1.a.a.2.0.a.2.ip6.arpa. 3600 IN SOA ns1.upc.biz. hostmaster.chello.at )

Appears to be changes to IPv4 Netblock; Domain; and (no) IPv6 Netblock assignments?

Does this relate to new service agreements, or firmware updates pushed to box? I have made Reset-to-Factory, and reconfigured; as well as 24-hour wait + restarts. But am not able to regain the previous functionality from my end.

I see many comments from customers wanting IPv4 change, but I preferred the mixed CGNAT mode. Now I can’t reach external IPv6 targets directly, and VPN sessions need rerouting. Here’s the report from online test @ https://test-ipv6.com:

Your IPv4 address on the public Internet appears to be: 77.57.166.XX
Your Internet Service Provider (ISP) appears to be: SUNRISE
Your Domain appears to be: hispeed.ch
No IPv6 address detected.
You appear to be able to browse the IPv4 Internet only. You will not be able to reach IPv6-only sites.
To ensure the best Internet performance and connectivity, ask your ISP about native IPv6.
Your DNS server (possibly run by your ISP) appears to have IPv6 Internet access.

Xydocq

hello ericJ7

Welcome to the community.

To my knowledge, there are two “types” of connections available. One based on IPv4, the other is DS-Lite (IPv6 protocol).
Seeing, you had a public IPv4-address and also an IPv6-address assigned, buffles me. I never heard of anything like that before, for an internet-connection by Sunrise.

CG-NAT is something, you never been assigned to. CG-NAT is solely based on IPv4. The reserved IP-addresses for CG-NAT are 100.64.0.0 to 100.127.255.255. None of those IPs have been assigned to your connection. You always got a unique public IP-address.

You can call 0800 707 707 and request a switch back to IPv6. Not sure if that will solve your issues.

ericJ7

Hello, and thanks for the quick reply!

had a public IPv4-address and also an IPv6-address assigned,

Sorry, should have been clearer with the tech details… did not have a public (fixed) IP previously. My IPv4 & IPv6 would vary over time, but always from the same Netblocks. Not a problem for me as I don’t need fixed public IP access.

I will make a call later today and request a change back to previous config. Then wait and reset again for another verification test. Thanks!

ericJ7

OK - I was able to phone the HelpDesk, and request a return to DS-lite… quick work.

19-06-2025 12:01:44 notice Cable Modem Reboot - from SNMP;

Initial testing seems mostly ok, have IPv6 DHCP assignments now, and DNS resolution is working.

Nuc13e: enp4s0 IPv6 set to Automatic, Privacy-ext: Default, Mode: Stable-privacy
IPv6 DNS servers : 2001:730:3e82::11, 2001:730:3e82::10
IPv6 DS-Lite status : Enabled
DS-Lite-FQDN : aftr01.upc.ch

( https://dnscheck.tools ) Hello! Your IP addresses are:

AS6730-MNT 31.10.142.1XX ptr: 31-10-142-1XX.cgn.dynamic.upc.ch Wettingen, Aargau, CH
AS8404-MNT 2a02:aa10:6280:e900:eb84:f36e:fa82:68XX ns: ns1.upc.biz Basel, Basel-City, CH

Check @ https://ipv6-test.com # IPv6 connectivity Report:

IPv6 Supported
Address 2a02:aa10:6280:e900:eb84:f36e:fa82:68XX
Type Native IPv6
SLAAC No
ICMP Filtered
Hostname None
ISP Sunrise GmbH

DNS Report:

DNS4 + IP6 Reachable
DNS6 + IP4 Reachable
DNS6 + IP6 Reachable

I will make some additional tests later, for latency and MTU; with higher traffic levels. Does Sunrise (UPC) use single-AFTR, or load-balancing (anycast)? Some of my DNS tests were sporadic earlier. And I want to check CGN hairpinning to previously working targets. But so far so good. No specific cause, but likely due to infra-transition UPC/Sunrise.

Want to also thank all the helpful community posts, and the nice search engine via Flarum!