Turning Off DNS Lookups When Performing Dataplane Packet Capture?

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L2 Linker

Turning Off DNS Lookups When Performing Dataplane Packet Capture?

Is it possible to turn off DNS lookups when performing packet captures on the dataplane?

 

I was hoping to run some pcaps, without taking up too many unnecessary resources through DNS lookups.

 

Thanks.

Community Manager

Re: Turning Off DNS Lookups When Performing Dataplane Packet Capture?

you can narrow down your packet-diag filters so you only capture what you're trying to troubleshoot (I'd recommend it, over disabling functionality because your filter is too generic)

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L2 Linker

Re: Turning Off DNS Lookups When Performing Dataplane Packet Capture?

That's true. I can do that.

 

But the other issue I have is that I would really like to see the IP addresses, in the default output, at times, and not the DNS name.

 

Is it even possible to turn off the DNS lookups?

 

Clarke Morledge

William & Mary 

L7 Applicator

Re: Turning Off DNS Lookups When Performing Dataplane Packet Capture?

Hello,

The PCAPs will have the IPs listed. As for disabling, I'm not sure and dont recommend it.

 

Regards,

L2 Linker

Re: Turning Off DNS Lookups When Performing Dataplane Packet Capture?

I should have clarified what I was asking for. 

 

The quick and easy pcap viewing command that I found was this:

 

view-pcap filter-pcap name_of_file.pcap

 

When running this command, the default is to give you the DNS lookups.  Otherwise, I am not sure how to just look at the source/destination IP addresses, without offloading the pcap.  So, I was curious to know if there was some mechanism to view the pcap, like this, without having to show the DNS lookup information.

 

Thanks.

 

 

L4 Transporter

Re: Turning Off DNS Lookups When Performing Dataplane Packet Capture?

Good Afternoon

 

It is quite simple to do a packet capture trace from CLI and exclude DNS, if I understand your question.

 

view-pcap follow yes no-dns-lookup yes

 

I believe you are looking for the no-dns-lookup option.

this is be done by CLI only, not from the GUI.

 

Does this help?

 

 

L2 Linker

Re: Turning Off DNS Lookups When Performing Dataplane Packet Capture?

Thanks, Steve.  We have a winner.  I appreciate your help.  

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