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 ?
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.
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 ...
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.