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Cannot ping ASA 5505 INSIDE INTERFACE across VPN.

Posted on 2014-03-13
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Last Modified: 2014-03-14
Hello,

I cannot ping one of our remote offices ASA 5505's across the site-to-site VPN tunnel.  I've compared the configs of our offices and they do not look any different, so I do not know what I'm missing.

Site 1 cannot ping the inside interface of site 2, however site 2 can ping the inside interface of site 1.

ICMP traffic is being allowed through the firewall and ICMP is enabled in the global policy settings to be inspected.  

Quick note, I can ping site 2's inside interface from a system within site 2, I just can't do it across the VPN.

I'm working via ASDM, so any help fixing this via ASDM would be greatly appreciated.
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Question by:CKilmer1975
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LVL 26

Expert Comment

by:pony10us
ID: 39927831
Are you getting unreachable or time out?

Unreachable would mean the issue is probably at Site 1 (the originator of the failing ping)
Time Out would mean the issue is probably at Site 2 (the responder of the failing ping)
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Author Comment

by:CKilmer1975
ID: 39927846
I'm getting 'Request timed out."
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LVL 26

Expert Comment

by:pony10us
ID: 39927881
Okay, that means that the ping is probably getting from Site 1 to Site 2 but Site 2 is unable or refusing to send a response.

I would start by looking at the ACL's on Site 2 for an implicit deny.
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Author Comment

by:CKilmer1975
ID: 39927894
I've attached a screenshot of my ACL.  There are no implicit deny's for ICMP traffic.
ACL.png
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Expert Comment

by:pony10us
ID: 39927925
How about Device Management
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LVL 16
ID: 39928315
Which firmware version are you using?

Also can you post your NAT statements?


-BB
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Author Comment

by:CKilmer1975
ID: 39929283
Hi,

@ pony10us, I have nothing listed on that ICMP screen.

ASA : 8.2(5)
ASDM: 6.4(5)

I have attached my NAT info.

NAT info
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Accepted Solution

by:
Michael Ortega (Internetwerx, Inc.) earned 250 total points
ID: 39929344
Upgrade your firmware to the latest (or at least 8.4.2) and then enter this at the end of your NAT configuration for the tunnel:

no-proxy-arp route-lookup

MO/BB
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Author Comment

by:CKilmer1975
ID: 39929443
We do not have a service agreement with Cisco, so I do not have the ability to download firmware from their site.  Is there another way to procure it?
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LVL 16
ID: 39929559
No legal ways that I know of. The goal is basically to turn proxy arp off on your tunnel NAT configuration.

MO
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Author Comment

by:CKilmer1975
ID: 39929633
Ahh, and I suppose there's no way to do it in my current firmware?
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LVL 16
ID: 39929654
I don't believe so. Sorry about that. Support contract on a 5505 for 8x5 NBD is pretty reasonable. I believe it's only $100. Maybe $150 for the upgraded 24x7, 4 hour hardware replacement warranty. Either one will give you access to Cisco.com so you can download the latest system and asdm software.

MO
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LVL 16
ID: 39929659
I believe the above costs are for the 50 User licensed 5505. If this is a 10 User licensed 5505 it's even cheaper for SMARTnet.

MO
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LVL 26

Expert Comment

by:pony10us
ID: 39929708
I have a 5505 with:

ASA 8.2(2)4
ASDM 7.0(2)

Arp Proxy settings
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Author Comment

by:CKilmer1975
ID: 39929731
Thanks for pointing that out pony10us.  Here is my screen:

proxyarp

Will unchecking something here in anyway help?
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LVL 16
ID: 39929751
Would advise against that. Those are proxy arp settings on physical interfaces which you most likely need intact. We're talking about turning the proxy arp off specially on the tunnel NAT.

MO
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LVL 16
ID: 39929770
Here's a good read on how proxy arp works on an ASA: http://www.packetu.com/2011/11/07/the-asas-arp-behavior/

I would advise against turning it off globally on an interface. Since the issue is with how proxy-arp works across a VPN tunnel then you only need the ability to turn off proxy-arp on the NAT (or no NAT, technically) associated with the VPN tunnel.

MO
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Author Comment

by:CKilmer1975
ID: 39929801
Thanks for the info MO, I'll read up on it.  I'm still trying to figure out how to purchase a service contract.  Cisco's site redirects me to resellers, but the reseller sites aren't listing cisco service contracts so I'm emailing sales to get some answers.
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LVL 16
ID: 39929819
Get one through CDW. That's probably the easiest.

MO
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LVL 26

Expert Comment

by:pony10us
ID: 39929823
mgortega:

I see what you are getting at now.  Makes sense.  Here is another good article:  http://www.fir3net.com/Cisco-ASA/cisco-asa-proxy-arp-gotcha.html
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