بسم الله والحمد لله والصلاة والسلام علي رسول الله وآله وصحبه وإخوانه وسلم
Solved: I Can Ping The DNS Server But I Can Not Resolve Names!
Consider the previous topology, i was creating a child domain in Alex, i have set the DNS in the network properties to use 192.168.1.1 which is the ip address of Cairo_DC, however i could ping the ip address but i couldn't resolve names consequently i could not promote the Alex_DC to the active directory.
playing around this issue for sometime, i remembered that the ip helper address command used on Cisco router could also be used to forward traffic to DNS that is not located on the same subnet. As you know this command is used commonly for DHCP relay agent feature.
to sum up:
I have entered the following command under interface f1/0:
ip helper address 192.168.1.1
And finally thanks to Allah it worked.
Hope that has been informative to you.
ولا تنسوني والمسلمين من صالح الدعاء
وصلي الله وسلم وبارك علي النبي وآله وصحبه وإخوانه وسلم
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