IronPort - daily management guide - AsyncOS 7.6.1

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Troubleshooting the Network 9-24 Use the nslookup command to check the DNS functionality. Cisco IronPort AsyncOS 7.6 for Email Daily Management Guide Chapter 9 Testing and Troubleshooting The nslookup command can confirm that the appliance is able to reach and resolve hostnames and IP addresses from a working DNS (domain name service) server. mail3.example.com> nslookup Please enter the host or IP to resolve. []> example.com Choose the query type: 1. A 2. CNAME 3. MX 4. NS 5. PTR 6. SOA 7. TXT [1]> A=192.0.34.166 TTL=2d Table 9-3 Checking DNS Functionality: Query Types Query Type Description A the host's Internet address CNAME the canonical name for an alias MX the mail exchanger NS the name server for the named zone PTR the hostname if the query is an Internet address, otherwise the pointer to other information SOA the domain's “start-of-authority” information TXT the text information Use the tophosts command via the CLI or the GUI, and sort by Active Recipients. OL-25138-01
Chapter 9 Testing and Troubleshooting OL-25138-01 Troubleshooting the Network The tophosts command returns a list of the top 20 recipient hosts in queue. This command can help you determine if network connectivity problems are isolated to a single host or group of hosts to which you are attempting to send email. (For more information, see “Determining the Make-up of the Mail Queue” on page 49.) mail3.example.com> tophosts Sort results by: 1. Active Recipients 2. Connections Out 3. Delivered Recipients 4. Soft Bounced Events 5. Hard Bounced Recipients [1]> 1 Status as of: Mon Nov 18 22:22:23 2003 ActiveConn.Deliv.SoftHard # Recipient HostRecipOutRecip.BouncedBounced 1 aol.com36510255218 2 hotmail.com29071982813 3 yahoo.com13461231119 4 excite.com9838494 5 msn.com8427633 29 ^C “Drill-down” to use the hoststatus command on the top domains listed from the tophosts command results. The hoststatus command returns monitoring information about email operations relating to a specific recipient host. DNS information stored in the AsyncOS cache and the last error returned from the recipient host are also given. Data returned is cumulative since the last resetcounters command. (For more information, see Monitoring the Status of a Mail Host, page 6-12.) Using the hoststatus command on the top domains can isolate the performance issues with DNS resolution to the either the appliance or the internet. For example, if the hoststatus command for the top active recipient host shows many pending outbound connections, then try to determine if that particular host is down or unreachable, or if the appliance cannot connect to all or the majority of hosts. Cisco IronPort AsyncOS 7.6 for Email Daily Management Guide 9-25
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IronPort - daily management guide - AsyncOS 7.6.1

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