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What do these ALG setting on my router mean, and what is ALG? 12 "ALG" here stands for "Application-layer Gateway" That is, firewall modules which cope with some peculiarities of those protocols On a stateful firewall, the "state" is usually tied to just addresses and port numbers That is, you send a packet from port X to server's port Y, and the firewall automatically allows the reverse back in
networking - Can’t Access Port-Forwarded Services on Frontier Arris . . . Disabled UPnP, ALG, etc Verified NAT is Disabled DMZ is Disabled (haven’t tried enabling it yet) Device Configuration: NUC has SSH running and accessible internally on 192 168 254 39:XX22 No software firewall (no ufw, iptables rules blocking) Verified: NUC responds to internal SSH and web traffic WAN IP is publicly pingable, not behind CGNAT
Port 21 is open but I cant connect to FTP server - Super User It's rare to find a NAT gateway with FTP ALG code to allow a server behind the NAT to be reached via Passive FTP, but it's somewhat less rare to find a NAT gateway with ALG code to allow an inside client to reach an outside server via Active FTP Most modern FTP clients default to Passive FTP
Why SIP-ALG in routers and modems? - Super User Without SIP-ALG you may have one-way audio on VoIP conversations (see below) Unfortunately the SIP-ALG in many routers is poorly implemented and causes more problems than it solves If you have one of these problem routers it is recommended that the SIP-ALG is disabled and other methods used to ensure VoIP works correctly
FTP passive server setup works when it shouldnt work The ALG mode: the server ignores passive port settings, if any, and generates a random port on its own on every PASSV command from client The router automatically opens this port
vpn - What does the OpenVPN auth directive do? - Super User The Reference manual for OpenVPN 2 4 defines the auth parameter, which overrides this same parameter in the config file, as follows: --auth alg Authenticate data channel packets and (if enabled) tls-auth control channel packets with HMAC using message digest algorithm alg (The default is SHA1 ) HMAC is a commonly used message authentication algorithm (MAC) that uses a data string, a secure