LinuxQuestions.org - Pass wordless ssh over IPv6

- Linux - Newbie (https://www.linuxquestions.org/questions/linux-newbie-8/)

- - Pass wordless ssh over IPv6 (https://www.linuxquestions.org/questions/linux-newbie-8/pass-wordless-ssh-over-ipv6-4175445527/)

Pass wordless ssh over IPv6

Hello,

I want to enable passwordless ssh over IPv6 in dual stack (both IPv4 and IPv6 coexist) environment.

ssh-keygen by default using hostname from /etc/hosts file.

I have enabled IPv6 on my machine and able to self ssh with IPv6 ip.

Code:

[root@test ~]# ssh fe80::20c:29ff:fe18:687c%eth0

Address fe80::20c:29ff:fe18:687c%eth0 maps to test6, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!

root@fe80::20c:29ff:fe18:687c%eth0's password:

Last login: Mon Jan 14 07:59:08 2013 from fe80::20c:29ff:fe18:687c%eth0

[root@test ~]#

However ssh is not working with host name,though my /etc/hosts has entries.

Code:

[root@test ~]# cat /etc/hosts

### beginning of base hosts configuration ###

127.0.0.1 localhost

::1      localhost6.localdomain6 localhost6

10.55.199.113 test test

### end of base hosts configuration ###

10.55.199.113 test4 test4

fe80::20c:29ff:fe18:687c test6 test6

Could anyone pls help me in this.

I believe the problem is that you have conflicting IP numbers for the host.

It looks to me like both 10.55.199.113 and fe80::20c:29ff:fe18:687c are for the same machine. I'm basing this on the fact 10.55.199.113 are both test4 and test. Forward lookups would find the 10.55.199.113, but a reverse lookup will only find test as that is the first entry.

I think that forward and reverse lookups have to match. Now whether ssh recognizes multiple IP numbers and adds all of them to the known hosts entry I don't remember.

Yes both 10.55.199.113 and fe80::20c:29ff:fe18:687c are same machine. I have no issues over Ipv4 for resolution. However with Ipv6 its not working though I have added it in /etc/hosts files.