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I am sorry, the alias option I was refering to was the arp command....ARP INSIDE n.n.n.n hhhh.hhhh.hhhh ALIASWe were using this form because the firewall was not advertising the mac address of inside to the outside interface. This worked fine until...
Any chance you have used the arp command with the alias option? We ran into this same issue a year ago along with a hit on bug CSCdw57969 which was first fixed in versions 6.2(0.237) and 6.2(0.239). The arp issue has not come back since the removal ...