Date: Wed, 17 Jul 2002 22:16:41 +0800 (CST) From: Tai-hwa Liang <avatar@www.mmlab.cse.yzu.edu.tw> To: freebsd-stable@FreeBSD.org Subject: slow ssh connection speed(bind problem?) Message-ID: <20020717214655.R51546-100000@www.mmlab.cse.yzu.edu.tw>
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Hi,
After cvsupped to the latest version of RELENG_4 this morning, I
found that the sshd on the newly built system takes more time during ssh
connection handshaking:
some.host.on.lan> ssh -vvv newly.built.releng.4.server
.
.
.
debug1: SSH2_MSG_NEWKEYS received
debug1: done: ssh_kex2.
debug1: send SSH2_MSG_SERVICE_REQUEST
debug1: service_accept: ssh-userauth
debug1: got SSH2_MSG_SERVICE_ACCEPT # stuck about 1 minute here
.
.
Server debug log:
.
.
debug1: newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: KEX done
debug3: Trying to reverse map address 192.168.0.9. # stuck here
.
.
Both of the client and server run OpenSSH-3.4p1. Neither the
server nor the client has named enabled.
I'm pretty sure that there is *no* change in any resolv related
configuration file on newly.built.releng.4.server:
/etc/hosts
::1 localhost localhost.my.domain
127.0.0.1 localhost.my.domain localhost
192.168.0.12 newly.built.releng.4.server test
/etc/resolv.conf:
domain my.domain.
search my.domain.
nameserver 192.168.0.1
/etc/host.conf:
# First try the /etc/hosts file
hosts
# Now try the nameserver next.
bind
# If you have YP/NIS configured, uncomment the next line
# nis
However, the sshd seems being blocked at canohost.c:77 for about
65 seconds:
$OpenBSD: canohost.c,v 1.32 2002/06/11 08:11:45 itojun Exp $
.
.
.
/* Map the IP address to a host name. */
if (getnameinfo((struct sockaddr *)&from, fromlen, name,
sizeof(name), NULL, 0, NI_NAMEREQD) != 0) {
/* Host name not found. Use ip address. */
log("Could not reverse map address %.100s.", ntop);
return xstrdup(ntop);
}
Furthermore, if I turned on log_in_vain on the server side,
there would be several lines of "Connection attempt to UDP 127.0.0.1:1073
from 127.0.0.1:53" appended to server log during client connection.
I'm wondering whether there was any bind(especially getnameinfo())
related changes in recent RELENG_4. Or did I miss any sshd_config related
knobs?
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