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Verifying Specific Types of addresses
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You can also use Nslookup to verify specific types of addresses, including Mail eXchange (MX) addresses used to identify the mail servers for a domain . To identify the mail server for a domain, open a command prompt and run the following command .
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nslookup "-set type=mx" domainname
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For example, to use Nslookup to view all MX servers listed for the domain microsoft .com using the client s default DNS servers, type the following command .
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nslookup "-set type=mx" microsoft.com
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Additionally, you can query a specific DNS server by listing the server name or IP address after the domain name in the following form .
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nslookup "-set type=type" hostname server_name_or_address
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Using TCP for DNS lookups
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Windows Networking
hen a DNS server returns a response to a DNS query but the response contains more DNS records than can fit into a single UDp packet, the
client may decide to send the query again, this time using TCp instead of UDp. With TCp, multiple packets can deliver all the DNS records in the response. You can use Nslookup to test whether a DNS server can respond using either UDp or TCp. Use the following command to submit a UDp query to the DNS server.
CHapTER 31 Troubleshooting Network Issues
nslookup microsoft.com
The following command uses TCp to query the DNS server.
nslookup "-set vc" microsoft.com
The set vc parameter configures Nslookup to use a virtual circuit. This test can be especially useful when you are expecting a large number of DNS records in response to a query.
pathping
Perhaps the most useful tool for isolating connectivity problems from the client, PathPing (PathPing .exe) can help diagnose problems with name resolution, network connectivity, routing, and network performance . For this reason, PathPing should be one of the first tools you use to troubleshoot network problems . PathPing is a command-line tool whose syntax is similar to that of the Tracert and Ping tools .
note
ping s usefulness has become very limited in recent years, and it is no longer an
effective tool for determining the state of network services. ping often reports that it cannot reach an available server because a firewall, such as Windows Firewall, is configured to drop Internet Control Message protocol (ICMp) requests. If a host is still capable of responding to ICMp requests, ping might report that the remote host is available even if critical services on the remote host have failed. To determine whether a remote host is responding, use the portQry support tool instead of ping.
To test connectivity to an endpoint, open a command prompt and run the following command .
pathping destination
The destination can be a host name, a computer name, or an IP address .
pathping Output
PathPing displays its output in two sections . The first section is immediately displayed and shows a numbered list of all devices that responded between the source and the destination . The first device, numbered 0, is the host on which PathPing is running . PathPing will attempt to look up the name of each device, as shown here .
Tools for Troubleshooting
CHapTER 31
Tracing route to support.go.microsoft.contoso.com [10.46.196.103]over a maximum of 30 hops: 3 6 7 8 9 10 13 0 contoso-test [192.168.1.207] 4 10.125.39.213 5 1 10.211.240.1 2 10.128.191.245 10.128.191.73 gbr1-p70.cb1ma.ip.contoso.com [10.123.40.98]
tbr2-p013501.cb1ma.ip.contoso.com [10.122.11.201] tbr2-p012101.cgcil.ip.contoso.com [10.122.10.106] gbr4-p50.st6wa.ip.contoso.com [10.122.2.54] gar1-p370.stwwa.ip.contoso.com [10.123.203.177] 10.127.70.6 10.46.155.17 11 14 10.46.33.225 10.46.129.51 12 15 10.46.36.210 10.46.196.103
To speed up the display of PathPing, use the d command option to keep PathPing from attempting to resolve the name of each intermediate router address . The second section of the PathPing output begins with the message Computing statistics for xxx seconds . The amount of time for which PathPing computes statistics will vary from a few seconds to a few minutes, depending on the number of devices that PathPing found . During this time, PathPing is querying each of the devices and calculating performance statistics based on whether and how quickly each device responds . This section will resemble the following .
Computing statistics for 375 seconds... This Node/LinkHop RTT Lost/Sent = Pct 0/ 100 = 1/ 100 = 0/ 100 = 2/ 100 = 0/ 100 = 0/ 100 = 2/ 100 = 1/ 100 = 2/ 100 = 0/ 100 = 0/ 100 = 1% 0% 2% 0% 0% 2% 1% 2% 0% 0% 1/ 100 = 0/ 100 = 2/ 100 = 0/ 100 = 0/ 100 = 2/ 100 = 1/ 100 = 2/ 100 = 0/ 100 = 0/ 100 = 1% 0% 2% 0% 0% 2% 1% 2% 0% 0% 0/ 100 = 0/ 100 = 0/ 100 = 0/ 100 = 0/ 100 = 0/ 100 = 0/ 100 = 0/ 100 = 0/ 100 = 0/ 100 = 100/ 100 =100% 100/ 100 =100% Source to Here Lost/Sent = Pct 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% | | | | | | | | | 1 2 3 4 5 6 7 8 9 50ms 50ms 50ms 44ms 46ms 40ms 62ms 107ms 111ms 118ms --Address 0 contoso-test [192.168.1.207] 10.211.24.1 10.128.19.245 10.128.19.73 10.12.39.213 gbr1-p70.cb1ma.ip.contoso.com [10.12.40.98] tbr2-p013501.cb1ma.ip.contoso.com [10.12.11.201] tbr2-p012101.cgcil.ip.contoso.com [10.12.10.106] gbr4-p50.st6wa.ip.contoso.com [10.12.2.54] gar1-p370.stwwa.ip.contoso.com [10.12.203.177] | 10 | 11 10.12.70.6 10.46.33.225
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