Filter
Top Products
ASYNC ROUTER AR-P, AR-5, AND SYNC ROUTER USER’S MANUAL
80
NOTE
If a dialup connection has already been established between offices, the filter does not
prevent the packets from transitioning the link. The filter only prevents packets from
causing the Router to initiate the connection by dialing out.
Long IP filter example
These filters can be entered from the Router command prompt. Do not use the IP addresses below.
They are for EXAMPLE ONLY! Comments are preceded by “#”. The filters are executed in order, and
the overall filtering depends upon the interplay of all of the filters.
#These filters will allow your network users to ping to hosts in the
outside world.
filter add f0 -s 199.98.122.1/32 -p 1 -t allow
filter add f00 -d 199.98.122.1/32 -p 1 -t allow
filter add f1 -s 199.98.122.3/32 -p 1 -t allow
filter add f2 -d 199.98.122.3/32 -p 1 -t allow
#These filters will allow FTP activities to and from the host
with IP address 199.98.122.3.
filter add f3 -s 199.98.122.3/32 -d any 20 -p 6 -t allow
filter add f4 -s any 20 -d 199.98.122.3/32 -p 6 -t allow
filter add f5 -s 199.98.122.3/32 20 -p 6 -t allow
filter add f6 -d 199.98.122.3/32 20 -p 6 -t allow
filter add f7 -s 199.98.122.3/32 -d any 21 -p 6 -t allow
filter add f8 -s any 21 -d 199.98.122.3/32 -p 6 -t allow
filter add f9 -s 199.98.122.3/32 -p 6 -t allow
filter add f10 -d 199.98.122.3/32 21 -p 6 -t allow
#These filters will block telnet activities originating from the
outside world, but will allow your network users to telnet to the
outside world.
filter add f11 -d any 23 -p 6 -t deny -i modem0 -f inbound
filter add f12 -s 199.98.122.3/32 -d any 23 -p 6 -t allow
filter add f13 -s any 23 -d 199.98.122.3/32 -p 6 -t allow
#These filters will allow mail to and from the host 199.98.122.3.
filter add f14 -s 199.98.122.3/32 -d any 25 -p 6 -t allow
filter add f15 -s any 25 -d 199.98.122.3/32 -p 6 -t allow
filter add f16 -s 199.98.122.3/32 25 -p 6 -t allow
filter add f17 -d 199.98.122.3/32 25 -p 6 -t allow
#These filters will allow udp and tcp transfers.
filter add f18 -s 199.98.122.3/32 -d any 53 -p 6 -t allow
filter add f19 -s any 53 -d 199.98.122.3/32 -p 6 -t allow
filter add f20 -s 199.98.122.3/32 53 -p 6 -t allow
filter add f21 -d 199.98.122.3/32 53 -p 6 -t allow
filter add f22 -s 199.98.122.3/32 -d any 53 -p 17 -t allow
filter add f23 -s any 53 -d 199.98.122.3/32 -p 17 -t allow