12-07-2011
Quote:
Originally Posted by
Twirlip
SSH2_MSG_KEXINIT (key exchange initialization) is the first part of the SSH key exchange, as described here (space added because I am not allowed to post links):
http ://tools.ietf.org/html/rfc4253#section-7.1
Having said that, are you sure this isn't a DNS problem? Delays like this can be caused by the server trying to do a DNS lookup, but getting a timeout. Often this is for logging purposes, so you may be able to prevent it by telling the server to log IP addresses instead of DNS names.
Think so, I suppose that it can be suppressed by disabling reverse DNS lookup for sshd daemon.
You can try add line "UseDNS no" into /etc/ssh/sshd_config file.
If you would like to switch off using DNS lookup for sshd at all you should probably add appropriate option to ssh SMF manifest and then refresh service configuration.
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LEARN ABOUT CENTOS
ipa-dns-install
ipa-dns-install(1) IPA Manual Pages ipa-dns-install(1)
NAME
ipa-dns-install - Add DNS as a service to an IPA server
SYNOPSIS
ipa-dns-install [OPTION]...
DESCRIPTION
Adds DNS as an IPA-managed service. This requires that the IPA server is already installed and configured.
OPTIONS
-p DM_PASSWORD, --ds-password=DM_PASSWORD
The password to be used by the Directory Server for the Directory Manager user
-d, --debug
Enable debug logging when more verbose output is needed
--ip-address=IP_ADDRESS
The IP address of the IPA server. If not provided then this is determined based on the hostname of the server.
--forwarder=FORWARDER
A forwarder is a DNS server where queries for a specific non-resolvable address can be directed. To define multiple forwarders use
multiple instances of --forwarder
--no-forwarders
Do not add any DNS forwarders, send non-resolvable addresses to the DNS root servers.
--reverse-zone=REVERSE_ZONE
The reverse DNS zone to use
--no-reverse
Do not create new reverse DNS zone. If used on a replica and a reverse DNS zone already exists for the subnet, it will be used.
--zonemgr
The e-mail address of the DNS zone manager. Defaults to hostmaster@DOMAIN
-U, --unattended
An unattended installation that will never prompt for user input
EXIT STATUS
0 if the installation was successful
1 if an error occurred
IPA
Jun 28, 2012 ipa-dns-install(1)