Internet VPN - Client access dropping terminal session

Martin Nørgaard

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Sep 5, 2001, 3:05:14 AM9/5/01

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Hi there,

My setup is a couple of VPN tunnels (Raptor Mobile) on an ADSL connection.
This builds the "physical" link from my PC in Copenhagen and an AS/400 in
Germany. On that connection I run CA (not express) terminal emulation. It
works fine and I'm generally very (!) pleased with this setup and the
fantastic speed at which it operates.

There's only one little problem. When I do not operate one of the CA
sessions for a while it looses the connection to the 400. The VPN connection
via Raptor stands and generally has a 120 min. timeout. But the terminal
just drops dead and I have to reconnect that. Have been on the lookout for a
timeout parameter on CA, but then again, it never happens if I'm running it
direct via LAN. Must be something fishy in the combination of PC5250 and
Raptor/VPN.

I've tried setting up a recurring PING to keep the VPN tunnel alive. But
even though the TCP/IP connection stands the individual sessions still drop
the connection.

Know it's tricky, but I would be grateful for help on this issue.

Martin Nørgaard

Jeffrey Flaker

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Sep 5, 2001, 5:35:59 PM9/5/01

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This doesn't sound like a VPN issue. Check the TCP/IP Time-out on the AS/400.
I am not sure off hand as to where exactly this is, I would assume it would be
in CFGTCP.

Regards
JEFF

jeffreyf.vcf

Jerry Phillips

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Sep 6, 2001, 10:09:05 AM9/6/01

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This sounds like a firewall/vpn problem to me. Make sure you have the most recent
copy of Raptor Mobile (6.5.3 I believe). Also, are you connecting this client to
raptor firewall? We had this similar problem that was solved by tweaking the
telnetd proxy on the firewall.

Martin Nørgaard

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Sep 10, 2001, 3:42:22 AM9/10/01

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Hi there,

Thanks for your answers. To complicate matters further I do connect with
Raptor 6.5.1 to a raptor firewall at a software house in Germany. But(!)
from there on it goes out to a major client site, and I'm now certain that
the problem sticks somewhere in their network. Jeffrey, your suggestion
sounds abolutely spot-on. Except I don't have any control or influence on
the remote network and the security setup there.

I think I'll just stick to my looping macro that ensures telnet activity.
That does seem to keep everything a session running when I'm at lunch ;-)

Once again; thanks for your help

Regards

Martin Nørgaard

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Njål Fisketjøn

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Sep 10, 2001, 1:39:15 PM9/10/01

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I have a similar problem, using Cisco VPN client over ADSL. Connecting with the same
client over ISDN dosn't time out. My problem's somewhere in my home router setup, because
Telnet doesn't drop out if I bypass my home router (Zyxel 316) and connect directly to the
ADSL router (a Cisco 677i).

When direct LAN attachment doesn't drop, it can't have anything to do with AS/400 TCP/IP
configuration (timeout). In stead there must be an error somewhere else.

I wish you good luck in your search.

--
Njål Fisketjøn, FIGU DATA AS
n...@figu.no

Bill Wragg

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Sep 10, 2001, 7:29:20 PM9/10/01

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I can tell you by experience it is not the combination Raptor and Client
access. I run exactly that, raptormobile client to a raptor server via the
internet, with ADSL using Raspppoe. Running Client access express to a mod
170 V5R1.

I can stay up indefinetly as long as the tunnel is up. I have the tunnel set
to maximum time. Home lan is 100 mg to hub, the DSL Alcatel modem is
connected to the uplink port on the hub. Even have 4 computers all connect
to the dsl no problem.

--
Bill Wragg

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