I tested the chromium snap (1165) on a focal machine with IPv6 and
couldn't reproduce DNS lookup problems. I did, however, find a
difference between this chromium and unconfined chrome when handling
IPv6 large packets (unconfined chrome works as expects and chromium
times out).
Unconfined chrome output:
Test with IPv4 DNS record ok (0.032s) using ipv4
Test with IPv6 DNS record ok (0.034s) using ipv6
Test with Dual Stack DNS record ok (0.039s) using ipv6
Test for Dual Stack DNS and large packet ok (0.043s) using ipv6
Test IPv4 without DNS ok (0.033s) using ipv4
Test IPv6 without DNS ok (0.048s) using ipv6
Test IPv6 large packet ok (0.046s) using ipv6
Test if your ISP's DNS server uses IPv6 ok (0.052s) using ipv6
Find IPv4 Service Provider ok (0.447s) using ipv4 ASN 14868
Find IPv6 Service Provider ok (0.398s) using ipv6 ASN 14868
Chromium from snap:
Test with IPv4 DNS record ok (0.140s) using ipv4
Test with IPv6 DNS record ok (0.142s) using ipv6
Test with Dual Stack DNS record ok (0.159s) using ipv6
Test for Dual Stack DNS and large packet ok (0.094s) using ipv6
Test IPv4 without DNS skipped (0.087s)
Test IPv6 without DNS skipped (0.155s)
Test IPv6 large packet timeout (15.011s)
Test if your ISP's DNS server uses IPv6 ok (0.194s) using ipv6
Find IPv4 Service Provider ok (0.222s) using ipv4 ASN 14868
Find IPv6 Service Provider ok (0.208s) using ipv6 ASN 14868
Test IPv6 large packet description:
Validates that IPv6 requests with large packets work. If this test times out,
but other IPv6 tests work, it suggests that there may be PMTUD issues; possibly
involving IP tunnels. Double check to make sure that ICMPv6 Type 2 ("Packet Too
Big") messages are not filtered by your firewall.
Test us from https://test-ipv6.com/
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https://bugs.launchpad.net/bugs/1876083
Title:
chromium snap from focal fails DNS lookups, or delays them (ipv6)
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