IPv6 happy eyeball on dualstack host

[sachin gupta <sachin1.g@xxxxxxxxx>]

Hi

We are shifting to IPv6 dual stack hosts. As per squid documentation, IPv6 is enabled by default. I tried a request on www.google.com which has both IPv4 and IPv6 address.

As per documentation, based on DNS response squid will try both IP4 and IPv6 if DNS return both addresses. But I see that squid is only getting IPv4 address though with dis command I can see IPv6 address as well. Also from same host, I am able to make curl command to google using IPv6.

DNS logs for squid

24/06/05 10:41:54.953 kid1| 5,4| AsyncCallQueue.cc(59) fireNext: entering helperHandleRead(conn4 local=[::] remote=[::] FD 13 flags=1, data="" size=5, buf=0x55c87a45bd60)

2024/06/05 10:41:54.953 kid1| 5,4| AsyncCall.cc(41) make: make call helperHandleRead [call4]

2024/06/05 10:41:54.953 kid1| 78,3| dns_internal.cc(1792) idnsALookup: idnsALookup: buf is 32 bytes for www.google.com, id = 0xe006

2024/06/05 10:41:54.953 kid1| 5,4| AsyncCall.cc(29) AsyncCall: The AsyncCall helperHandleRead constructed, this=0x55c87a9301e0 [call89]

2024/06/05 10:41:54.953 kid1| 5,5| Read.cc(58) comm_read_base: comm_read, queueing read for conn4 local=[::] remote=[::] FD 13 flags=1; asynCall 0x55c87a9301e0*1

2024/06/05 10:41:54.954 kid1| 5,5| ModEpoll.cc(116) SetSelect: FD 13, type=1, handler=1, client_data=0x7f183475a700, timeout=0

2024/06/05 10:41:54.954 kid1| 5,4| AsyncCallQueue.cc(61) fireNext: leaving helperHandleRead(conn4 local=[::] remote=[::] FD 13 flags=1, data="" size=5, buf=0x55c87a45bd60)

2024/06/05 10:41:54.955 kid1| 78,3| dns_internal.cc(1318) idnsRead: idnsRead: starting with FD 11

2024/06/05 10:41:54.955 kid1| 5,5| ModEpoll.cc(116) SetSelect: FD 11, type=1, handler=1, client_data=0, timeout=0

2024/06/05 10:41:54.955 kid1| 78,3| dns_internal.cc(1364) idnsRead: idnsRead: FD 11: received 48 bytes from 10.0.32.2:53

2024/06/05 10:41:54.955 kid1| 78,3| dns_internal.cc(1171) idnsGrokReply: idnsGrokReply: QID 0xe006, 1 answers

2024/06/05 10:41:54.955 kid1| 5,5| Connection.cc(99) cloneProfile: 0x55c87a944210 made conn56 local=0.0.0.0 remote=142.251.215.228:80 HIER_DIRECT flags=1

2024/06/05 10:41:54.955 kid1| 5,5| Connection.cc(99) cloneProfile: 0x55c87a944830 made conn57 local=0.0.0.0 remote=142.251.215.228:80 HIER_DIRECT flags=1

2024/06/05 10:41:54.955 kid1| 5,3| ConnOpener.cc(43) ConnOpener: will connect to conn57 local=0.0.0.0 remote=142.251.215.228:80 HIER_DIRECT flags=1 with 15 timeout

2024/06/05 10:41:54.955 kid1| 5,5| comm.cc(428) comm_init_opened: conn58 local=0.0.0.0 remote=[::] FD 16 flags=1 is a new socket

2024/06/05 10:41:54.955 kid1| 5,4| AsyncCall.cc(29) AsyncCall: The AsyncCall Comm::ConnOpener::earlyAbort constructed, this=0x55c87a944cd0 [call95]

2024/06/05 10:41:54.955 kid1| 5,5| comm.cc(1004) comm_add_close_handler: comm_add_close_handler: FD 16, AsyncCall=0x55c87a944cd0*1

2024/06/05 10:41:54.955 kid1| 5,4| AsyncCall.cc(29) AsyncCall: The AsyncCall Comm::ConnOpener::timeout constructed, this=0x55c87a944d70 [call96]

Dig Output

dig www.google.com  AAAA

; <<>> DiG 9.16.23-RH <<>> www.google.com AAAA

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27477

;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 4096

;; QUESTION SECTION:

;www.google.com. IN AAAA

;; ANSWER SECTION:

www.google.com. 237 IN AAAA 2607:f8b0:400a:804::2004

;; Query time: 0 msec

;; SERVER: 10.0.32.2#53(10.0.32.2)

Can you please help and let me know if I am missing anything.

Regards

Sachin

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