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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 1–99 and 1300–1999 (expanded range)
•
Extended
: access list numbers 100–199 and 2000–2699 (expanded range)
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Asante IntraCore IC36240
User’s Manual