... logical link layer to upper application layer,such as TCP/IP/UDP and so on.And it supports static and dynamic ... firewall and packet filter4. Support multi protocols , such as TCP/IP,UDP,ICMP,SMTP,HTTP,POP3,OICQ,TELNET,FTP ,SNMP ,etc ... connection15. Support multi WAN dial method, including auto allocated IP, specifying local IP, specifying local and remote IP16. Can be used as ...