Open port on firewall to allow using DNS Service
Open port on firewall to allow using DNS Service
1. Prepare
- DC21 : Domain Controller (pns.vn), IP 10.0.0.21 | DC22 : Terminal Server , IP 10.0.0.22
- ASA : Cisco ASA 8.42 , IP management 10.0.0.100
- WIN1091 : Client , IP 10.0.2.91 ( LAN2 )
2. Step by step : Open port on firewall to allow using DNS Service on DC21 ( Port tcp-udp 53 )
- WIN1091 : Point DNS to DC21 and test resolve hostname
+ Start - cmd - nslookup - DC22.pns.vn === DNS request timed out
+ Ping 10.0.0.21 === OK
+ Telnet 10.0.0.21 53 === Connect failed
- DC22 : Open port 53 on firewall
+ Access the Cisco ASA using ASDM :
+ Configuration tab - Firewall - Right-click LAN2 - Add Access Rule...
+ Action : Permit
+ Source : 10.0.2.91
+ Destination : 10.0.0.21
+ Service : - tcp-udp/53 - OK
+ Description : Using DNS service === OK - Apply
- WIN1091 : Test resolve hostname again
+ Start - run - cmd - Telnet 10.0.0.21 53 === OK
+ nslookup - DC22.pns.vn (10.0.0.22) === OK
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