Application Layer Gateway for FTP, ICMP, and TFTP Protocols
You can enable or disable ALG for the FTP protocol for an large scale NAT64 configuration by enabling or disabling the FTP ALG option of the LSN group of the configuration.
ALG for the ICMP protocol is enabled by default, and there is no provision to disable it.
ALG for the TFTP protocol is disabled by default. TFTP ALG is enabled automatically for an large scale NAT64 configuration when you bind a UDP LSN application profile, with endpoint-independent-mapping, endpoint-independent filtering, and destination port as 69 (well-known port for TFTP), to the LSN group.