Solved: I Can Ping The DNS Server But I Can Not Resolve Names ! !!

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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.

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Change Windows Hostname Using CLI

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Change Windows Hostname Using CLI

1- Open the CMD and enter the follwoing:

 

wmic computersystem where name="Old_Name" call rename name="New_name"

2- Reboot:

shutdown /r

3- Verify:

hostname 

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How To Enable Remote Desktop Connection To Windows 2008 Core Installation

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 How To Enable Remote Desktop Connection To Windows 2008 Core Installation

1- Enable the Remote Desktop for Administration mode to accept connections:

cscript C:\Windows\System32\Scregedit.wsf /ar 0

in order to view your current settings you can type:

cscript C:\Windows\System32\Scregedit.wsf /ar /v

If you see "1" in the script output, that means that RDP connections are denied.

If you see a "0", they will be allowed.

for example:

2-  If you are running the Terminal Services client on a previous 
version of Windows, you must turn off the higher security level that is 
set by default in Windows Server 2008. To do this, type the following 
command at the command prompt: 

cscript C:\Windows\System32\Scregedit.wsf /cs 0 

3- Allow the RDP to pass through the firewall:
netsh advfirewall firewall set rule group="Remote Desktop" new enable=yes

 Also this is a short video showing the whole process:

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Installing Loopback Interface in Server 2008 R2

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Installing Loopback Interface in Server 2008 R2

 

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CCNP R&S TShoot Summary

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CCNP R&S TShoot Summary 

A lot of Time, and effort it took me to summarize the tshoot book during my study. this is the summary, and i hope it will be informative and helpful for all.

Download 

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IP SLA

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IPv6 Stateless Autoconfiguration

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Default Redistribution Metrics

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Default Redistribution Metrics

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OSPF Virtual Links

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OSPF Virtual Links

Watch On YouTube

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Cisco Router As TFTP Server

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Cisco Router As TFTP Server

sometimes you may need TFTP server urgently, but you do not have one, in this situations you can use your Cisco router as the TFTP server. simply you can use the first command without using an ACL to filter traffic, nonetheless you can use both commands to apply the ACL.

R(config)#tftp-server flash:r1-confg alias Labconfig 1

R(config)#access-list 1 permit host 192.168.1.2

Watch on Youtube

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HSRP Simple Lab Using SVI Interface

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HSRP Simple Lab Using SVI Interface

Download HD

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Watch on Youtube

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CCNP Switching Summary From Chapter 4 Till the end

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Dear All,

This is my CCNP Switching summary from chapter 4 till the end. the first 3 chapters are a hrad copy, if i got a new scanner, i will upload them for you by Allah's willing

Download

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Using CoreFTP With GNS3

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Using CoreFTP With GNS3  

Download Video HD

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Dot1x in Gns3 Using Cisco ACS on Windows Server 2003

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 Dot1x in Gns3 Using Cisco ACS on Windows Server 2003

i was searching on the internet how to implement Dot1x in GNS3, the problem was that 802.1x depends on physical ports, i tried it on GNS3 but failed. thanks to Allah finally i came across the following video, it solved it, yes. the magic is that you make the SVI of the switch the default gateway for your client and for your router, thus the switch redirect your authentication request to the Radius " ACS " server.

   

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how to deny access to certain website using your cisco router

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how to deny access to certain website using your cisco  router

i know it may be silly to talk about this method of denying acceess to certain websites, but i mainly intend to show you a quick method of denying access to certain websites without the need to use advanced web filtering programs that may need a dedicated server or even multiple servers to do this task. look this method may be vulnerable or easily bypassed  but anyway this is the case over here.

this method depends on using class maps to filter the website:

class-map match-any SOCIAL_NET
match protocol http host www.facebook.com
match protocol http host www.youtube.com
match protocol http host twitter.com
!
policy-map DROP_SOCIAL_NET
class SOCIAL_NET
drop
!
!
interface FastEthernet0/1
service-policy output DROP_SOCIAL_NET
!

but what about using https???

if you noted that in the class map i did not mentioned https, but you can using the following command:

match protocol secure-http

but this will deny the https access to any web content that is encrypted using https "port 443". this is because cisco has other web filtering solutions that give you more flexibility of web filtering so it did not allowed us to use the https with the website name.

so if you decided to prevent the https, Firefox has a powerful addons that allows you to open whatever you need using https, i came a cross a powerful one called "https every where", really awesome.

hope that has been informative to you and i would like to thank your for following this blog.

Best Regards

Ahmed Mustafa

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