Interface identifiers (IDs) in IPv6 addresses are used to identify a unique interface on a link and are sometimes referred to as the "host portion" of the IPv6 address. Interface IDs must be unique on a link. They are always 64-bits long and can be dynamically created, based on the data-link layer address. The specific data link layer type of the interface determines how the IPv6 interface IDs are dynamically created and how address resolution works. For Etherne..
SNMP Versions 1 and 2 included a standard generic MIB, with initial MIB-I (version 1, RFC 1156) and MIB-II (version 2, RFC 1213). MIB-II was actually created in between the release of SNMPv1 and v2, with SNMPv1 supporting MIB-II as well. After the creation of the MIB-II specification, the IETF SNMP working group changed the strategy for MIB definition. Instead of the SNMP working group creating standard MIBs, other working groups, in many different technology areas, were task..
This section discusses how to configure IPX addresses on LAN and WAN interfaces for Cisco routers. We also discuss the configuration of the four IPX LAN interface encap-sulations used in an IPX environment. LAN Interface Configuration All Cisco routers that are routing IPX have a unique IPX network.node address on each of the attached LAN segments. This address enables the router to know which networks are connected to each interface and where packets for those networks sho..
Restricting Inbound Telnet Access
You can restrict which IP addresses can access the router as follows: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#access-list 99 permit 172.25.1.0 0.0.0.255 Router1(config)#access-list 99 deny any log Router1(config)#line vty 0 4 Router1(config-line)#access-class 99 in Router1(config-line)#exit Router1(config)#end Router1# Thi..
To modify the default DHCP lease time for a pool of IP addresses, use the lease configuration command: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#ip dhcp pool 172.25.2.0/24 Router1(dhcp-config)#lease 2 12 30 Router1(dhcp-config)#exit Router1(config)#end Router1# The lease command takes up to three options: lease days [hours] [minutes], with hours and minutes being optional. You can specify a maximum ..
