Logging of L2-Aware NAT is supported via accounting policy associated with the ESM subscriber (outside of NAT). In addition to ESM subscriber specific attributes, the NAT port-ranges and outside IP address (nat-port-range command in regular ESM accounting policy) are reported in the same accounting messages.
Fri Jul 13 11:57:38 2012
Acct-Status-Type = Start
NAS-IP-Address = 10.1.1.1
User-Name = "l2-aware-nat"
Framed-IP-Address = 198.51.100.100
Framed-IP-Netmask = 255.255.255.0
Class = 0x6c322d61776172652d636c737373
Calling-Station-Id = "remote-l2-aware0"
NAS-Identifier = "left-a20"
Acct-Session-Id = "D896FF0000001150006F7C"
Event-Timestamp = "Jul 13 2012 11:57:00 PDT"
NAS-Port-Type = Ethernet
NAS-Port-Id = "1/1/5:5.13"
ADSL-Agent-Circuit-Id = "l2-aware-nat"
ADSL-Agent-Remote-Id = "remote-l2-aware0"
Alc-Subsc-ID-Str = "l2-aware-1"
Alc-Subsc-Prof-Str = "l2-aware-nat"
Alc-SLA-Prof-Str = "tp_sla_prem"
Alc-Nat-Port-Range = "10.0.0.1 1024-1079 router base"
Alc-Client-Hardware-Addr = "2001:db8:65:05:13:01"
Acct-Delay-Time = 0
Acct-Authentic = RADIUS
Acct-Unique-Session-Id = "6bbbd5a110313b47"
Timestamp = 1342205858
Request-Authenticator = Verified
RADIUS accounting initiated by BB-ISA card is not supported for L2-Aware NAT.
Syslog/SNMP/Local-file logging can be enabled simultaneously with L2-Aware NAT RADIUS accounting (which is in this case regular ESM RADIUS accounting).