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the request: 
 
-8.x needs UDP access to 20.x and 21. 
-We also need 12.x subnet to be able have NTP access to the 22.x 
 
i'm reading that as 1) 8.x needs to be able to send UDP traffic to 20.x and 21.x and 2) &nbsp;12.x needs to send NTP traffic to 22.x. 
 
based on a year old config file that was sent to me, each subnet is a vlan with extended access groups for inbound and outbound traffic. i am going to have to look at the current config when i visit my client and go from there. 
 
would this be accomplished by? 
 
for 1) 
ip access-list extended vlan8_out 
permit udp x.x.8.0 0.0.0.255 any 
 
ip access-list extended vlan20_in 
permid udp x.x.8.0 0.0.0.255 any 
 
ip access-list extended vlan21_in 
permid udp x.x.8.0 0.0.0.255 any 
 
for 2) 
 
ip access-list extended vlan12_out 
permit udp any eq ntp x.x.22.0 0.0.0.255 
 
ip access-list extended vlan22_in 
permit udp any eq ntp x.x.22.0 0.0.0.255 

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the request:

-8.x needs UDP access to 20.x and 21.
-We also need 12.x subnet to be able have NTP access to the 22.x

i'm reading that as 1) 8.x needs to be able to send UDP traffic to 20.x and 21.x and 2)  12.x needs to send NTP traffic to 22.x.

based on a year old config file that was sent to me, each subnet is a vlan with extended access groups for inbound and outbound traffic. i am going to have to look at the current config when i visit my client and go from there.

would this be accomplished by?

for 1)
ip access-list extended vlan8_out
permit udp x.x.8.0 0.0.0.255 any

ip access-list extended vlan20_in
permid udp x.x.8.0 0.0.0.255 any

ip access-list extended vlan21_in
permid udp x.x.8.0 0.0.0.255 any

for 2)

ip access-list extended vlan12_out
permit udp any eq ntp x.x.22.0 0.0.0.255

ip access-list extended vlan22_in
permit udp any eq ntp x.x.22.0 0.0.0.255


NTP access list help

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.