This very likely has to do w/ a /etc/resolv.conf file on the machines, pointing to an inaccessible DNS server. It's caused by ssh hitting DNS for an IPv6 address. So even though the order in the nsswitch.conf file may be
hosts: files,nisplus,dns
ssh will have the following order:
IPv6-files,IPv6-nisplus,IPv6-dns,IPv4-files,IPv4-nisplus,IPv4-dns

And if a bad DNS server is in the resolv.conf, then the IPv6-dns search is the holdup. You can do a quick test of this by forcing IPv4 on your ssh command line:
ssh -4 node1 date
It should go much faster. If it does, then you need to fix your resolv.conf files on the nodes.

Jeremy

At 09:38 PM 1/30/2003 -0500, Weirong Zhu wrote:

Dear all:

   Platform Redhat 7.2. Oscar 1.3
   It's strange that the SSH connection to slave nodes from master node
became very slow recently.
   I try "ssh -v c1" (c1 is a slave node)
   I got:
====================================================================
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Rhosts Authentication disabled, originating port will not be
trusted.
debug1: restore_uid
debug1: ssh_connect: getuid 2473 geteuid 0 anon 1
====================================================================
It will stop here for almost 40 seconds
Then continue remaining steps very quickly.

Meanwhile, rsh to slave nodes is very quickly,and ssh from slave nodes to
master nodes, is also very fast.

Does anybody has idea about this issue?

Thanks.


Weirong



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