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An Application Layer Gateway (ALG) enables the gateway to parse application layer payloads and decide whether to allow or deny traffic to the application server. ALGs supports applications such as Transfer Protocol (FTP) and various IP protocols that use the application layer payload to communicate the dynamic Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) ports on which the applications open data connections.
| Feature hierarchy | Feature Name |
|---|---|
| Application Layer Gateways / | 464XLAT ALG traffic |
| Application Layer Gateways / | ALG message buffer optimization |
| Application Layer Gateways / | ALGs |
| Application Layer Gateways / | ALGs in Multinode High Availability |
| Application Layer Gateways / | DNS ALGs |
| Application Layer Gateways / | DNS ALGs: DDNS support |
| Application Layer Gateways / | FTP ALGs |
| Application Layer Gateways / | FTP, TFTP, SIP, RTSP and PPPT ALG support with NAT64 |
| Application Layer Gateways / | H.323 ALGs |
| Application Layer Gateways / | H.323 Avaya ALGs |
| Application Layer Gateways / | ICMP, ping, and traceroute ALGs for MS-MICs and MS-MPCs |
| Application Layer Gateways / | IP ALG support in AS PIC service rules |
| Application Layer Gateways / | IPv6 ALG Support for ICMP (Routing, NAT, NAT-PT support) |
| Application Layer Gateways / | IPv6 ALG support for FTP (NAT, NAT-PT support) |
| Application Layer Gateways / | IPv6 TFTP ALG Support |
| Application Layer Gateways / | IPv6 support for PPTP ALG |
| Application Layer Gateways / | IPv6 support for RTSP ALG |
| Application Layer Gateways / | IPv6 support for SIP ALG |
| Application Layer Gateways / | Media Gateway Control Protocol (MGCP) ALGs |
| Application Layer Gateways / | NAT64 for H.323 ALG |
| Application Layer Gateways / | Per-subscriber application-aware policy control |
| Application Layer Gateways / | Point-to-Point Tunneling Protocol (PPTP) ALGs |
| Application Layer Gateways / | RPC ALGs: MS-RPC |
| Application Layer Gateways / | RPC ALGs: MS-RPC ALG and Sun RPC ALG map table scaling |
| Application Layer Gateways / | RPC ALGs: ONC and DCE |
| Application Layer Gateways / | RPC ALGs: Sun RPC |
| Application Layer Gateways / | Real-Time Streaming Protocol (RTSP) |
| Application Layer Gateways / | Real-Time Streaming Protocol (RTSP) ALG: Interleave mode |
| Application Layer Gateways / | Remote shell (RSH) ALG |
| Application Layer Gateways / | SCCP (Skinny Client Control Protocol) ALGs |
| Application Layer Gateways / | SCCP ALGs: v20 |
| Application Layer Gateways / | SIP ALGs: Scaling busy lamp field (BLF) support |
| Application Layer Gateways / | SIP ALGs: TCP support |
| Application Layer Gateways / | SIP ALGs: bulk-call-mode and call-distribution |
| Application Layer Gateways / | SIP NEC |
| Application Layer Gateways / | SMTP |
| Application Layer Gateways / | Session Initiation Protocol (SIP) ALGs |
| Application Layer Gateways / | Structured Query Language (SQL) ALGs |
| Application Layer Gateways / | TALK ALGs |
| Application Layer Gateways / | Trivial File Transfer Protocol (TFTP) ALGs |