aha:
ddstreet@lp1886128:~$ sudo iptables -n -t security -L OUTPUT
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- 0.0.0.0/0 168.63.129.16 owner UID match 0
DROP tcp -- 0.0.0.0/0 168.63.129.16 ctstate
INVALID,NEW
it seems like this is being added by walinuxagent:
Jul 13 16:21:15 lp1886128 python3[1298]: 2020/07/13 16:21:15.672132 INFO
ExtHandler Successfully added Azure fabric firewall rules
Jul 13 16:21:15 lp1886128 python3[1298]: 2020/07/13 16:21:15.683188 INFO
ExtHandler Firewall rules:
Jul 13 16:21:15 lp1886128 python3[1298]: Chain INPUT (policy ACCEPT 0 packets,
0 bytes)
Jul 13 16:21:15 lp1886128 python3[1298]: pkts bytes target prot
opt in out source destination
Jul 13 16:21:15 lp1886128 python3[1298]: Chain FORWARD (policy ACCEPT 0
packets, 0 bytes)
Jul 13 16:21:15 lp1886128 python3[1298]: pkts bytes target prot
opt in out source destination
Jul 13 16:21:15 lp1886128 python3[1298]: Chain OUTPUT (policy ACCEPT 0 packets,
0 bytes)
Jul 13 16:21:15 lp1886128 python3[1298]: pkts bytes target prot
opt in out source destination
Jul 13 16:21:15 lp1886128 python3[1298]: 0 0 ACCEPT tcp --
* * 0.0.0.0/0 168.63.129.16 owner UID match 0
Jul 13 16:21:15 lp1886128 python3[1298]: 0 0 DROP tcp --
* * 0.0.0.0/0 168.63.129.16 ctstate INVALID,NEW
** Also affects: walinuxagent (Ubuntu)
Importance: Undecided
Status: New
** Summary changed:
- systemd-resolved does not resolve address due to udp payload size.
+ walinuxagent blocks DNS fallback to TCP
** Changed in: systemd (Ubuntu)
Status: In Progress => Invalid
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https://bugs.launchpad.net/bugs/1886128
Title:
walinuxagent blocks DNS fallback to TCP
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