Configure AAA on a router - Extended ACLs

[bensteele17]

How do I write a named extended ACL which will allow for traffic between a DNS from a LAN (IP address) to a DNS server at (IP address), ping from a host PC (IP address) to any destination and allow for telnet packets from a telnet server with any source address going to any destination? calvindude spain

[AnwarJutt98]

allow for traffic between a DNS from a LAN (IP address) to a DNS server at (IP address)

permit udp <LANIPaddress> <LANIPwildcard> <DNSIPaddress> 0.0.0.0 eq 53
permit tcp <LANIPaddress> <LANIPwildcard> <DNSIPaddress> 0.0.0.0 eq 53

ping from a host PC (IP address) to any destination 

permit imcp <hostPCaddress> 0.0.0.0 any echo

allow for telnet packets from a telnet server with any source address going to any destination calvindude russia

permit tcp any eq 23 any

Depending on where exactly you apply the rules, you might also require ACL rules for their reverse directions. Don't forget that an ACL denies/filters everything without an explicit permit.