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Poor performances when scanning hosts.equiv


From: Gilles Mocellin
Subject: Poor performances when scanning hosts.equiv
Date: Fri, 6 Feb 2004 18:50:53 +0100 (CET)

I saw 30s delay when doing remote commands (don't
blame me, I haven't the choice now) between ~ 200
servers with slow links (75kb/s), and 4 DNS.

When a server do a remote command on an other, if its
position in the hosts.equiv is deep, and the DNS is
not on the target LAN, it is slow.

Having done a tcpdump on the target, I saw numerous
DNS requests.

In fact, the problem is that the names in hosts.equiv
are resolved to IPs.
In the function __checkhost_sa() (file inet/rcmd.c)

But Why ?
We have both names, and we could compare them...

It looks like it's done like this on SCO OpenServer
and HP-UX.

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