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Step-by-Step Configuration and Troubleshooting Best Practices for the NGFW, NGIPS and AMP Technologies A Visual Guide to the Cisco Firepower Threat Defense (FTD)
Community Member

ASA 8.4 and proxy-arp for static with service

Hi, I know there's the bug CSCti38867, but today I've verified that ASA 8.4(2) does proxy-arp on outside interface for static like that:

static (inside,outside) static private_ip public_ip

but not for static like that:

static (inside,outside) static private_ip public_ip service tcp-ftp tcp-ftp

is that a know bug ?

thanks

Everyone's tags (5)
3 REPLIES
Cisco Employee

ASA 8.4 and proxy-arp for static with service

ASA should proxy ARP for port forwarding as well.

Now, as the bug says, it is on release pending and it says, asa MAY fail to proxy ARP, so the fact that it works for some IPs or in other ASAs can be an option.

In order to identify if it is because of this same bug, you will need to setup a capture type ether-type arp and check on the ARP request from the upstream router and check if the FW is getting it, if it does but it does not answer, then it is because of this same bug.

Mike

Mike
Community Member

ASA 8.4 and proxy-arp for static with service

OK, I'll verify with the capture type ether-type arp, anyway can I solve the issue with the arp command with alias option ?

Thinking to update the ASA version, I've found an 8.4(2)-8 interim but I cannot find the 8.5 ...

Renato

Cisco Employee

ASA 8.4 and proxy-arp for static with service

Nope,

The way to temporally solve it until the bugs throws out a version that will fix this problem will be putting an static ARP entry on the upstream router.

Mike

Mike
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