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Configuring IP Services
IP Services Configuration Examples
IPC-122
Cisco IOS IP Configuration Guide
ip address 128.9.1.2
transmit-interface ethernet 1
!
interface ethernet 1
ip address 128.9.1.2
!
!use show interfaces command to find router1-MAC-address-E1
arp 128.9.1.1 router1-MAC-address-E1 arpa
DRP Server Agent Example
The following example enables the DRP Server Agent. Sources of DRP queries are limited by access
list 1, which permits only queries from the host at address 33.45.12.4. Authentication is also configured
for the DRP queries and responses.
ip drp server
access-list 1 permit 33.45.12.4
ip drp access-group 1
ip drp authentication key-chain mktg
key chain mktg
key 1
key-string internal
Numbered Access List Examples
In the following example, network 36.0.0.0 is a Class A network whose second octet specifies a subnet;
that is, its subnet mask is 255.255.0.0. The third and fourth octets of a network 36.0.0.0 address specify
a particular host. Using access list 2, the Cisco IOS software would accept one address on subnet 48 and
reject all others on that subnet. The last line of the list shows that the software would accept addresses
on all other network 36.0.0.0 subnets.
access-list 2 permit 36.48.0.3
access-list 2 deny 36.48.0.0 0.0.255.255
access-list 2 permit 36.0.0.0 0.255.255.255
interface ethernet 0
ip access-group 2 in
The following example defines access lists 1 and 2, both of which have logging enabled:
interface ethernet 0
ip address 1.1.1.1 255.0.0.0
ip access-group 1 in
ip access-group 2 out
!
access-list 1 permit 5.6.0.0 0.0.255.255 log
access-list 1 deny 7.9.0.0 0.0.255.255 log
!
access-list 2 permit 1.2.3.4 log
access-list 2 deny 1.2.0.0 0.0.255.255 log
If the interface receives 10 packets from 5.6.7.7 and 14 packets from 1.2.23.21, the first log will look
like the following:
list 1 permit 5.6.7.7 1 packet
list 2 deny 1.2.23.21 1 packet
Five minutes later, the console will receive the following log:
list 1 permit 5.6.7.7 9 packets
list 2 deny 1.2.23.21 13 packets