Date: 05 Mar 2002 15:03:11 -0700 From: John-David Childs <freebsd@nterprise.net> To: Scott Stevens <myxlplyx@fuse.net> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Wierd network issues on LAN - hard to describe Message-ID: <1015365791.14114.73.camel@lohr> In-Reply-To: <006301c1c388$05d7ec90$6401a8c0@tenchi> References: <006301c1c388$05d7ec90$6401a8c0@tenchi>
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I had a situation at one of my employers where I *can't*
(administratively) resolve DNS (forward or reverse) for internal hosts
(yeah, I could always set up a separate DMZ/outside DNS...which is in
the works), and adding an entry to /etc/hosts is completely unfeasible.
The solution, therefore, was to add entries in /etc/hosts.allow for
those services which depend on DNS lookups (and which are linked with
the tcpwrapper library). In addition, the version of OpenSSH
distributed with 4.5-RELEASE (2.9p2, I believe), does NOT honor the
"ReverseMappingCheck off" directive in /etc/ssh/sshd_config...I had to
install 3.0.2 from the ports.
For small networks, /etc/hosts is the way to go...for larger networks,
using tcpwrapper's /etc/hosts.{allow,deny} and service configuration
files is the better thing to do.
On Mon, 2002-03-04 at 07:22, Scott Stevens wrote:
> I've recently started having some interesting network issues with my machine
> and was hoping someone here could help me out.
>
> I'm having trouble connecting to my machine running FreeBSD from any of the
> other machines on my lan (2 win2k machines and an Ibook). When I use telnet
> or ftp, the connection takes an obscene amount of time to connect, I would
> probably say almost 2 minutes and ssh and pop3 won't connect at all. Other
> things like web traffic and connecting to my shoutcast streams works fine.
> If I connect to the machine from anywhere outside my LAN, say from work or a
> friends house, everything works properly.
>
> My lan is set up as such; I have adsl which comes in via a Cisco 675, that
> is fed into a Linksys Cable/DSL router and then pushed out to each of the
> machines. At first I thought something was wonky with the linksys router so
> I double checked the port forwarding setup and then ultimately removed it
> from the mix all together when the problem didn't go away. Then I switched
> out network cards thinking the card might have gone bad (it was pretty old
> and needed to be swapped for a 10/100 anyway). Currently there is a Linksys
> LNE100TX (v5.1) in the machine, but that didn't seem to make any difference
> either.
>
> This problem just came out of the blue the other day and I have no idea
> what's up. Any ideas? Keep in mind the problem is only on my local network,
> everything works 100% if I connect to the machine from the outside.
>
> thanks in advance,
> scott.
>
>
>
>
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