BarbWire Help File

Protocol

This match is used to check for certain protocols. Examples of protocols are TCP, UDP and ICMP. First of all the protocol match can take one of the three aforementioned protocols, as well as ALL, which means to match all of the previous protocols. ALL protocols is the default behavior in case the protocol match is not used. This match can also be inversed with the preceding NOT, so NOT tcp would mean to match the ICMP and UDP protocols.

ICMP types

This is a complete listing of all ICMP types:

ICMP types

TYPE	CODE	Description	Query	Error
0	0	Echo Reply	x
3	0	Network Unreachable		x
3	1	Host Unreachable		x
3	2	Protocol Unreachable		x
3	3	Port Unreachable		x
3	4	Fragmentation needed but no frag. bit set		x
3	5	Source routing failed		x
3	6	Destination network unknown		x
3	7	Destination host unknown		x
3	8	Source host isolated (obsolete)		x
3	9	Destination network administratively prohibited		x
3	10	Destination host administratively prohibited		x
3	11	Network unreachable for TOS		x
3	12	Host unreachable for TOS		x
3	13	Communication administratively prohibited by filtering		x
3	14	Host precedence violation		x
3	15	Precedence cutoff in effect		x
4	0	Source quench
5	0	Redirect for network
5	1	Redirect for host
5	2	Redirect for TOS and network
5	3	Redirect for TOS and host
8	0	Echo request	x
9	0	Router advertisement
10	0	Route solicitation
11	0	TTL equals 0 during transit		x
11	1	TTL equals 0 during reassembly		x
12	0	IP header bad (catchall error)		x
12	1	Required options missing		x
13	0	Timestamp request (obsolete)	x
14		Timestamp reply (obsolete)	x
15	0	Information request (obsolete)	x
16	0	Information reply (obsolete)	x
17	0	Address mask request	x
18	0	Address mask reply	x