IPF adding single rule

[Giorgos Keramidas]

On 2005-06-23 22:10, fbsd_user <fbsd_user at a1poweruser.com> wrote:
> ipfstat -ni lists the in core inbound rules with their line number
> Say I want to add a single rule before rule line number 17
> If I have a file addrule with  17 block in quick on dc0 from any to any
> and then issue ipf -f addrule  I get error that 17 is unknown keyword (17)
>
> Is there any way to insert a rule into the in core rules at the desired
> location and then later just remove that rule??

Yes there is a way.  You just have to prefix the rule number with '@'.

	# ipf -f -
	@17 block in quick on dc0 from any to any
	^D

This is apparent in the second BNF rule in the description of the IPF
syntax, documented in ipf.conf(5).