(By default, Ethernet 0 is the Outside interface.) Connect the other end to a cable/DSL modem or gateway router (the Outside network). The following configuration has to be applied to the firewall to establish a working TCP session between the laptop and the HTTP server. Step 1 Connect one end of an Ethernet cable (not provided) to Ethernet 0 on the ASA. Mfg.Part: ASA5505-50BUNK9-RF CDW Part: 4011784. The Cisco ASA 5505 is a full-featured firewall for small business, branch, and enterprise teleworker environments. The TCP SYN is allowed to flow from the laptop to the server, but the TCP ACK is blocked by the firewall. Cisco ASA 5505 Firewall Edition Bundle - security appliance.

Access-lists must be configured to allow the traffic flow from lower security levels to higher security levels.Р”Вespite this default behavior, the simulated ASA 5505 available in Packet Tracer 6.1 does not allow the laptop to establish a working TCP connection with the HTTP server located in the outside network. The default ASA 5505 firewall behavior is to allow traffic to flow from interfaces with higher security levels ('inside' interfaces) to interfaces with lower security levels ('outside' interfaces), but to deny traffic on the other way.

Cisco asa 5505 firewall