Need to select "Prefer to use IPv4 even if IPv6 available" to upgrade to 26.1?

[trdeal]

Hi,
After trying to upgrade to 26.1 even using Option 12 on the console and it failing with truncated .sig files. After googling I found a suggestion to enable "Prefer to use IPv4 even if IPv6 available" immediately doing this the upgrade process was completely different when this option was not selected. A summary of the upgrade and its changed appeared which appears to be hosted on github based on forum post did not appear when the option was not selected. When I perform a dig for github.com it does not have an IPv6 address which explains why it did not appear.

dig @8.8.8.8 github.com aaaa

; <<>> DiG 9.18.42 <<>> @8.8.8.8 github.com aaaa
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26887
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;github.com.                    IN      AAAA

;; AUTHORITY SECTION:
github.com.             1112    IN      SOA     dns1.p08.nsone.net. hostmaster.nsone.net. 1656468023 43200 7200 1209600 3600

;; Query time: 16 msec
;; SERVER: 8.8.8.8#53(8.8.8.8) (UDP)
;; WHEN: Wed Feb 04 05:54:38 GMT 2026
;; MSG SIZE  rcvd: 104

Is there any possibility to IPv6 support incorporated into the upgrade process so that "Prefer to use IPv4 even if IPv6 available" is not required in the future to perform an upgrade. Just to put things into context IPv6 traffic arriving at google.com peaked at 49.57% so far this year, it was 46.43% in January 2025. https://www.google.com/intl/en/ipv6/statistics.html

[franco]

> Is there any possibility to IPv6 support incorporated into the upgrade process so that "Prefer to use IPv4 even if IPv6 available" is not required in the future to perform an upgrade.

Isn't this a question for your ISP?  Your IPv6 is not fully functional.


Cheers,
Franco

[trdeal]

Thanks for the feedback, however I never had a problem with IPv6 connectivity in 11 years except with pfsense and now Opnsense (same problem with major upgrades), while upgrades within a major release never cause an issue with "Prefer to use IPv4 even if IPv6 available" disabled.
 

[franco]

Just post your firmware connectivity audit here so we can see :)


Cheers,
Franco