По началу не мог понять, куда же АСА прячется из трассы. Вот оно как.
http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_tech_note09186a0080094e8a.shtml#asatrace
http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_tech_note09186a0080094e8a.shtml#asatrace
Make the Firewall Show Up in a Traceroute in ASA/PIX
ciscoasa(config)#class-map class-default ciscoasa(config)#match any !--- This class-map exists by default. ciscoasa(config)#policy-map global_policy !--- This Policy-map exists by default. ciscoasa(config-pmap)#class class-default !--- Add another class-map to this policy. ciscoasa(config-pmap-c)#set connection decrement-ttl !--- Decrement the IP TTL field for packets traversing the firewall. !--- By default, the TTL is not decrement hiding (somewhat) the firewall.