[j-nsp] FW: VPN 3005 concentrator 3DES to Juniper M20 [7:70444]

[Bosco Sachanandani]

Hi Group

Thanks Lars and Tony for the feedback.

Just a couple of insights:
The tunnel status between both the boxes is up ie the IKE as well as IPsec part. Infact, when I established connectivity for the first time between the two, I was able to telnet and ftp (login only) from a host behind the Juniper to a host behind the VPN concentrator. Hence as Lars suggested below, I do not think it's got to do anything with IKE/IPSec negotiation. Also, there are no firewalls / ACLs defined in between.

The problem is definitely got to do some thing with resassembly of the ESP when it reaches the Juniper ES-PIC.

Well seems like there is a certain software upgrade possible on the Cisco Box, I have to get my hands on that one and test it out first, am planning to do so next week.

What I am seeking help from you guys about is that is there a way of re-configuring something on the Juniper or some software patch that allows me to configure fragmentation and packet assembly? You see most of our customers here are using a Cisco box, I can't keep telling them to upgrade to a higher IOS or Concentrator software version...... better try and change something from my side.

Thanks a ton for listening.

Cheers
Bosco

PS: Hey Tony! This Juniper Installation has been done by EPA itselF!! :) You can check it up with EPAHAHE..He has pointed out certain things for me to do here and check. Cheers!


-----Original Message-----
From: Lars Higham [mailto:lhigham at yahoo.com]
Sent: Tuesday, June 10, 2003 8:07 PM
To: juniper-nsp at puck.nether.net
Subject: RE: [j-nsp] FW: VPN 3005 concentrator 3DES to Juniper M20
[7:70444]


Hello Bosco,

First, ping across using small packet sizes, say 256 bytes.  If it still
doesn't work, it won't be an MTU/fragmentation issue.

Set traceoptions on the Juniper and send us some output - including the
initial IPSec negotiations, as well as when you're trying to
send/receive the aforementioned pings.


Regards,
Lars Higham

-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Bosco
Sachanandani
Sent: Tuesday, June 10, 2003 3:43 PM
To: juniper-nsp at puck.nether.net
Subject: [j-nsp] FW: VPN 3005 concentrator 3DES to Juniper M20 [7:70444]


I have send this mail to the Cisco group too to get some
insights.....would appreciate some feedback from you all too!

TIA
Bosco


-----Original Message-----
From: Bosco Sachanandani 
Sent: Tuesday, June 10, 2003 2:21 PM
To: cisco at groupstudy.com
Subject: VPN 3005 concentrator 3DES to Juniper M20 [7:70444]


Hey Group

I have a Cisco 3005 series concentrator box configured to run between my
Externel router and Checkpoint firewall such that:

INTERNET Router -------> VPN 3005 --------> Checkpoint------LAN

This is one segment of my network. On another segment of the network I
have a Juniper M20 router with an encapsulation card that is connected
to the internet via a different ISP.

I have sucessfully established a 3DES IPSec tunnel between these too
although I must admit that the freakin GUI interface of the VPN3005
sucks big time and is confusing compared to the ultra cool Juniper CLI.
It took me a while to explore the damn hidden options in the GUI!

The problem is that although the tunnel is established, no data can pass
through it! From what I have heard from a reliable source, there is some
compatibility issue relating to the frame size and packet fragmentation
when it arrives at the Juniper Interface. Juniper says that it's
router's are designed for a high amount of Internet traffic and that
packet fragmentation is not something a gateway router should be
bothered about. However, they have suggested certain Cisco boxes like
the 3662 that allows for packet fragmentation and other such stuff....

Any of you guys wanna shed some like on this and tell me how I can make
the 3005 talk to the M20?? Thanks a ton Cheers Bosco




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