Harald Hoyer wrote:
Kevin Kempter wrote:
Hi List;
First let me say that (1) I have a fairly unusual (I suspect) ssh
setup, and (2) I hate the virus known as windows
Here's the deal;
The client I'm working for uses a SonicWall firewall to control access
to the data centers. Unfortunately there are issues with the Linux
openVPN clients (specifically open swan) where it connects but locks
openvpn != openswan.
openvpn works fine for me, I have it working perfectly. All it needs is
UDP port 1194 (the standard port) open, and if the other end's not on
the firewall, then the firewall needs to forward UDP port 1194 to the
correct host.
I haven't (and probably won't) used SonicWall, all my firewall needs are
met with shorewall on Linux.
all other connections out of the firewall. So, until we figure this
out the solution is to use the windows version of the SonicWall
client. I've installed vmware and installed a copy of VirusXP (AKA
Windows XP). I installed cygwin and followed the instructions here to
install the ssh server: (
http://pigtail.net/LRP/printsrv/cygwin-sshd.html ) although I did not
run the mkpasswd and mkgroup commands, they seemed to break the
install of ssh server.
Anyway, I also setup an ssh key so I could login to the M of VirusXP
without a password.
Next I setup a config file in my Linux $HOME/.ssh dir with many
entries like this (one for each host in the data ceners that I need to
connect to):
Host dataCenterHostname
Hostname 10.1.x.x # data center I.P.
HostKeyAlias 10.1.x.x # data center I.P.
ProxyCommand /usr/local/bin/netcat-proxy-command
172.16.128.128 %h
The 172.16.128.128 I.P. addr is the I.P. of the VirusXP image within
vmware via nat. (I could not make the ssh connections work via bridged
networking).
The /usr/local/bin/netcat-proxy-command script is a netcat (nc) script
and contains this:
#!/bin/sh
gateway=$1
internal=$2
ssh $gateway nc -w 1 $internal 22
To use this setup I boot up VirusXP, open the SonicWall VPN client and
connect to one or more of the data centers. Then in Fedora 7 (the
host OS) I open a terminal and run this:
ssh dataCenterHostname
so, to my issue. Most of the time this setup works fairly well, in
that it does connect. It usually takes about 30 seconds for me to get
a password prompt for the target data center host. This is acceptable
but I think there's something weird going on that delay's the
connection. I say this because I can open a cygwin windowin VirusXP
and do an ssh <I.P.> and I get a password prompt immediately.
Sounds to me like you're getting three DNS timeouts. Make sure all IP
addresses resolve at both ends.
The main issue is that several times a day the connections start to
take several minutes to return the password prompt. I need to restart
the cygwin service in VirusXP, and sometimes that doesn't help so I
reboot the VM instance of VirusXP. This is quite frustrating, however
I'm a DBA and have limited networking knowledge. Does anyone have any
thoughts?, suggestions?, comments?
Thanks in advance..
You may try:
Host dataCenterHostname:
GSSAPIAuthentication no
in ~/.ssh/config
These are times I get:
08:56 [summer@numbat ~]$ time ssh school date
Sat Oct 13 08:56:57 WST 2007
real 0m4.649s
user 0m0.020s
sys 0m0.016s
08:56 [summer@numbat ~]$ time ssh cdm date
Sat Oct 13 08:58:40 WST 2007
real 0m0.568s
user 0m0.020s
sys 0m0.017s
08:56 [summer@numbat ~]$
"School" is in the 'net, one another ADSL user, while "cdm" is just two
wireless networks away.
--
Cheers
John
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