Packet captures on port ranges

SOLVED
DBCK
Here to help

Packet captures on port ranges

Hi all,

 

i'm sure there was a filter expression with the Meraki packet captures to capture a range of ports, can anybody confirm the expression required to capture a range, for example lets say i want to capture only Microsoft teams audio i would want to filter on this port range,

 

50,000-50,019

 

expression, "port range 50000 to 50019" is what i would logically assume but is not correct, can anyone advise.

 

Thanks

 

1 ACCEPTED SOLUTION

Accepted Solutions
KarstenI
Head in the Cloud

Re: Packet captures on port ranges

You can use the option portrange 50000-50019 for this (without a space and using a dash).

View solution in original post

5 REPLIES 5
KarstenI
Head in the Cloud

Re: Packet captures on port ranges

You can use the option portrange 50000-50019 for this (without a space and using a dash).

View solution in original post

DBCK
Here to help

Re: Packet captures on port ranges

Thanks Karstenl, something so simple but works as it should thanks for your response

KarstenI
Head in the Cloud

Re: Packet captures on port ranges

Well, it's not always that simple and at least my tcpdump expressions also not always work on the first try ... 🙂

PhilipDAth
Kind of a big deal

Re: Packet captures on port ranges

Pro tip; capture far more than you want, and then limit it in Wireshark afterwards using a display filter.

 

For example, I'd be tempted to use a capture filter of something like "udp" to capture all UDP traffic, and then narrow it down afterwards.

 

Often you'll find something unusual and want to see what else was happening around that time, or was there some other trigger, and you want to be able to just see those extra packets without doing another capture.

DBCK
Here to help

Re: Packet captures on port ranges

Thanks Philip, the problem i had with that is Meraki limits the duration to 1200 seconds (20minutes) or 100,000 packets and even filtering on UDP it runs for around 25 seconds and ive hit the 100,000 packets allready which is why i needed a more specific expression for the range i was looking at.

 

 

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