Dell BigIron RX Series, Configuration Manual

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532 BigIron RX Series Configuration Guide
53-1002253-01
Configuring numbered and named ACLs
21
•
Destination TCP or UDP port (if the IP protocol is TCP or UDP)
The IP protocol can be one of the following well-known names or any IP protocol number from 0 –
255:
•
Internet Control Message Protocol (ICMP)
•
Internet Group Management Protocol (IGMP)
•
Internet Gateway Routing Protocol (IGRP)
•
Internet Protocol (IP)
•
Open Shortest Path First (OSPF)
•
Transmission Control Protocol (TCP)
•
User Datagram Protocol (UDP)
For TCP and UDP, you also can specify a comparison operator and port name or number. For
example, you can configure a policy to block web access to a specific website by denying all TCP
port 80 (HTTP) packets from a specified source IP address to the website’s IP address.
To configure an extended access list that blocks all Telnet traffic received on port 1/1 from IP host
209.157.22.26, create the ACL with permit and deny rules, then bind the ACL to port 1/1 using the
ip access-group command. Enter the following commands.
Here is another example of commands for configuring an extended ACL and applying it to an
interface. These examples show many of the syntax choices. Notice that some of the entries are
configured to generate log entries while other entries are not thus configured.
The first entry permits ICMP traffic from hosts in the 209.157.22.x network to hosts in the
209.157.21.x network.
The second entry denies IGMP traffic from the host device named “rkwong” to the 209.157.21.x
network.
The third entry denies IGRP traffic from the 209.157.21.x network to the host device named
“rkwong”.
The fourth entry denies all IP traffic from host 209.157.21.100to host 209.157.22.1 and generates
Syslog entries for packets that are denied by this entry.
The fifth entry denies all OSPF traffic and generates Syslog entries for denied traffic.
The sixth entry permits all packets that are not explicitly denied by the other entries. Without this
entry, the ACL would deny all incoming or outgoing IP traffic on the ports to which you assign the
ACL.
BigIron RX(config)# access-list 101 deny tcp host 209.157.22.26 any eq telnet log
BigIron RX(config)# access-list 101 permit ip any any
BigIron RX(config)# int eth 1/1
BigIron RX(config-if-e10000-1/1)# ip access-group 101 in
BigIron RX(config)# write memory
BigIron RX(config)# access-list 102 perm icmp 209.157.22.0/24 209.157.21.0/24
BigIron RX(config)# access-list 102 deny igmp host rkwong 209.157.21.0/24 log
BigIron RX(config)# access-list 102 deny igrp 209.157.21.0/24 host rkwong log
BigIron RX(config)# access-list 102 deny ip host 209.157.21.100 host 209.157.22.1
log
BigIron RX(config)# access-list 102 deny ospf any any log
BigIron RX(config)# access-list 102 permit ip any any