Hi all,

I confirm the issue, it times out in IPv6, then fallback to IPv4, so it is 
mostly invisible bu slow:

bganne@BGANNE-DX076:~/src/vpp$ ssh -6 -vvv -p 29418 [email protected]
OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n  7 Dec 2017
debug1: Reading configuration data /home/bganne/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "gerrit.fd.io" port 29418
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to gerrit.fd.io [2600:1f14:9b3:3400:ee75:f90f:2247:905d] 
port 29418.
debug1: connect to address 2600:1f14:9b3:3400:ee75:f90f:2247:905d port 29418: 
Resource temporarily unavailable
ssh: connect to host gerrit.fd.io port 29418: Resource temporarily unavailable

ben

> -----Original Message-----
> From: [email protected] <[email protected]> On Behalf Of Elias Rudberg
> Sent: mercredi 30 octobre 2019 13:07
> To: [email protected]
> Subject: [vpp-dev] Access to gerrit.fd.io port 29418 works for IPv4 but
> not for IPv6?
> 
> Hello,
> 
> According to the instructions here
> https://wiki.fd.io/view/VPP/Pulling,_Building,_Running,_Hacking_and_Pushin
> g_VPP_Code#Pulling_code_via_ssh
> 
> pulling the code should be done like this:
> 
> git clone ssh://[email protected]:29418/vpp.git
> 
> However, from my computer that does not work (it hangs). First I
> thought this was due to port 29418 being blocked for me locally but it
> turns out that was not the issue.
> 
> Doing "host gerrit.fd.io" shows that it has both an IPv4 and an IPv6
> address:
> IPv4: 52.10.107.188
> IPv6: 2600:1f14:9b3:3400:ee75:f90f:2247:905d
> 
> If I use the IPv4 address instead of the hostname, like this, then it
> works:
> 
> git clone ssh://[email protected]:29418/vpp.git
> 
> Trying from another computer that only uses IPv4, it works as it should
> using the hostname.
> 
> So, it seems like the ssh access to gerrit.fd.io:29418 works for IPv4
> but not for IPv6. That would explain why I can get it to work by typing
> the IPv4 address instead of the hostname, I guess that forces IPv4 to
> be used.
> 
> As another way of verifying this, I tested disabling IPv6 completely on
> my computer. Then things work, consistent with the hypotethis that the
> problem is related to IPv6 configuration of the gerrit.fd.io server.
> (if I'm right, anyone trying to access gerrit.fd.io:29418 using IPv6
> should see this problem)
> 
> For now, using the IPv4 address works as a workaround, but I guess this
> is something that should be fixed in how the server is configured?
> 
> Best regards,
> Elias

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