Proto in packet capture filter

[dieter_b]

What is proto in packet capture filter ? The manual only says:

Proto—Specify the protocol to filter

The field only seems to accept numbers...

[TheSquire · Accepted solution]

Hi,

You need to enter the protocol number e.g. tcp is 6 etc.

[dieter_b]

Great, thanks. PA should have been clearer on that. Or they could present the protocols that apply in a dropdown...

[craymond]

Here is a document that gives a little detail:

Using the Proto Filter in Packet Capture

[nicoleannep]

access denied to the link you shared

[KWIlson01]

Here you go fam;
- https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml

Decimal	Keyword	Protocol	IPv6 Extension Header	Reference
0	HOPOPT	IPv6 Hop-by-Hop Option	Y	[RFC8200]
1	ICMP	Internet Control Message		[RFC792]
2	IGMP	Internet Group Management		[RFC1112]
3	GGP	Gateway-to-Gateway		[RFC823]
4	IPv4	IPv4 encapsulation		[RFC2003]
5	ST	Stream		[RFC1190][RFC1819]
6	TCP	Transmission Control		[RFC9293]
7	CBT	CBT		[Tony_Ballardie]
8	EGP	Exterior Gateway Protocol		[RFC888][David_Mills]
9	IGP	any private interior gateway (used by Cisco for their IGRP)		[Internet_Assigned_Numbers_Authority]
10	BBN-RCC-MON	BBN RCC Monitoring		[Steve_Chipman]
11	NVP-II	Network Voice Protocol		[RFC741][Steve_Casner]
12	PUP	PUP		[Boggs, D., J. Shoch, E. Taft, and R. Metcalfe, "PUP: An Internetwork Architecture", XEROX Palo Alto Research Center, CSL-79-10, July 1979; also in IEEE Transactions on Communication, Volume COM-28, Number 4, April 1980.][[XEROX]]
13	ARGUS (deprecated)	ARGUS		[Robert_W_Scheifler]
14	EMCON	EMCON		[Bich_Nguyen]
15	XNET	Cross Net Debugger		[Haverty, J., "XNET Formats for Internet Protocol Version 4", IEN 158, October 1980.][Jack_Haverty]
16	CHAOS	Chaos		[J_Noel_Chiappa]
17	UDP	User Datagram		[RFC768][Jon_Postel]