Can an S series switch perform Portal authentication if the Portal server is on the extranet

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If the Portal server is on the extranet, you can configure static NAT on the egress device to map the Portal server's port number required for Portal authentication to the intranet, and configure the Portal server to communicate with intranet devices and users. An S series switch (a non-S1700 switch) then can perform Portal authentication.

Other related questions:
Configure Portal authentication on S series switch
Portal authentication is also called web authentication. Generally, portal authentication websites are referred to as portal websites. In Portal authentication, users do not need a specific client and can access some free services and portal website without being authenticated. Among S series switches (except S1700), modular switches support only external Portal servers; fixed switches support both external Portal servers and built-in Portal servers (access devices provide the Portal server function).

S series switches' support for Portal authentication
Portal authentication is also called web authentication. For S series switches (except the S1700), Portal authentication can be classified into built-in Portal authentication and external Portal authentication. S series switches' support for external Portal authentication is as follows: - In V100R006: Switches except the S2700SI, S2710SI, S2700EI, S2752EI, S5700LI, and S5700S-LI support external Portal authentication. - In V200R001: Switches except the S5700LI and S5700S-LI support external Portal authentication. - In V200R002: Switches except the S5700LI and S5700S-LI support external Portal authentication. - In V200R003: Switches except the S2750EI, S5700LI, and S5700S-LI support external Portal authentication. - In V200R005 and later versions: All switch models support external Portal authentication. In versions earlier than V200R007C00, the S2720EI, S2750EI, S5700-10P-LI-AC, and S5700-10P-PWR-LI-AC support built-in Portal authentication only. In V200R007C00 and later versions, the S2720EI, S2750EI, S5700-10P-LI-AC, and S5700-10P-PWR-LI-AC that have Layer 3 hardware forwarding of IPv4 packets enabled support external Portal authentication. Only S series fixed switches support built-in Portal authentication.

Support for Portal authentication
Portal authentication is also called web authentication. Depending on the network layer where Portal authentication is performed, Portal authentication falls into Layer 2 and Layer 3 authentication. - Layer 2 Portal authentication: No Layer 3 forwarding device is deployed between the authentication client and AR. - Layer 3 Portal authentication: A Layer 3 forwarding device is deployed between the authentication client and AR. The support for Portal authentication is as follows: - In V200R003C00 and later versions, all AR models support Layer 2 and Layer 3 Portal authentication. - In versions earlier than V200R03C00, all AR models support only Layer 2 Portal authentication.

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