ine ccie rs lab topology

ine ccie rs lab topology

Permit   1. Each network elects a root bridge   　　 Many firewalls are not allowed to accept externally initiated connections when they are set up. Therefore, many FTP servers behind the firewall or intranet do not support PASV mode because the client cannot open the high-end port of the FTP server through the firewall. The client of the network cannot log in to the FTP server in PORT mode because the TCP 20 from the server cannot establish a new connection with the client on the internal network,ine ccie rs lab topology, resulting in inoperability.