Issue 376 in connectbot: Trying to use IPv6 on a non-IPv6 network stops connection

[conne...@googlecode.com]

Status: New
Owner: ----
Labels: Type-Defect Priority-Medium

New issue 376 by step...@rees-carter.net: Trying to use IPv6 on a non-IPv6
network stops connection
http://code.google.com/p/connectbot/issues/detail?id=376

What steps will reproduce the problem?
1. Run ConnectBot when connected to a non-IPv6 enabled network
2. Connect to a host with IPv6 (AAAA record) set in DNS as well as IPv4

What is the expected output?
- It should connect as per normal over IPv4

What do you see instead?
- It sits there trying to connect forever without any success

What version of the product are you using?
- ConnectBot 1.7.1

What type of system are you trying to connect to?
- Ubuntu & Debian linux servers (bilbo.valorin.net & rowlf.valorin.net)

Let me know if you need any other information.

[conne...@googlecode.com]

Comment #1 on issue 376 by douglaswth: Trying to use IPv6 on a non-IPv6

network stops connection
http://code.google.com/p/connectbot/issues/detail?id=376

I have seen similar behavior, except instead of trying to connect forever,
the connection times out and I get the "Host has disconnected. Close
Session? Yes/No" question.

[conne...@googlecode.com]

Comment #2 on issue 376 by eim...@etherkiller.de: Trying to use IPv6 on a

non-IPv6 network stops connection
http://code.google.com/p/connectbot/issues/detail?id=376

Hi,

could the bug poster please elaborate "forever without any success"?

While switching from a v6-enabled network to a v4-only network ConnectBot
usually gets a "Network unreachable".
This is the case when connecting to a v6-enabled WiFi, doing SSH via v6 and
disconnecting from said WiFi. ConnectBot then drops the connection as
expected.
After trying to reconnect it fails with "Network unreachable"
(address/route over WiFi had been removed). Nevertheless ConnectBot cached
the AAAA address and will not try to do an A-RR lookup until it is killed
and started again.

[conne...@googlecode.com]

Comment #3 on issue 376 by ckujau: Trying to use IPv6 on a non-IPv6 network
stops connection
https://code.google.com/p/connectbot/issues/detail?id=376

"forever without any success" - Connectbot looks up the DNS name of the
target hosts and gets both the IPv4 & IPv6 address as response. It then
tries to connect to the IPv6 address but if there's no IPv6 connectivity
present (i.e. no v6 routes), Connectbot fails to connect and will
eventually time out.

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