Other types of traffic to consider include the following.
External protocols and IP Addresses
•ICMP from service provider IP Addresses
Explicitly permitted return traffic for internal connections to the Internet
•Specific Internet Control Message Protocol (ICMP) types
•Outbound Domain Name System (DNS) query replies
•TCP established
•User Datagram Protocol (UDP) return traffic
•FTP data connections
•TFTP data connections
•Multimedia connections
Explicitly permitted externally sourced traffic destined to protected internal addresses
•VPN Traffic
•HTTP to web servers
•Secure Socket Layer (SSL) to web servers
•FTP to FTP servers
•Inbound FTP data connections
•Simple Mail Transfer Protocol (SMTP)
•Other applications and servers
•Inbound DNS queries
•Inbound DNS zone transfers
Important: By default, if no conditions match, the software rejects the address.
The switch supports two types of access lists:
•Standard: access list numbers
•Extended: access list numbers
59 | Asante IntraCore IC36240 | User’s Manual |