____________________________________________________________________________________
____________________________________________________________________________________
NTU Optical Network Terminals
23
Destination—
destination IP address;
Gateway—
gateway IP address;
Subnet Mask—
subnet mask (Genmask);
Flag—
routing flag:
–
U—active route;
–
!
—inactive route, packets will be rejected;
–
G
—the route uses gateway;
–
H
—destination address is a separate host;
–
R
—restored route;
–
D
—the route was created after receiving a redirected ICMP message;
–
M
—the route was changed by a redirected ICMP message;
Metrics—
route priority;
Service—
a service the route is associated with;
Interface—
an interface the route is associated with.
4.1.6
The “ARP” submenu. Display of the ARP Protocol Cache
The ARP efficiency depends a lot on ARP cache presented in every host. The cache contains Internet
addresses and corresponding MAC addresses. Every record is stored in cache for 5 minutes since its creation.
IP address—
client IP address;
Flags—
status flags:
–
Completed—
client is active;
–
Incomplete—
client does not respond to ARP queries;
MAC address—
client MAC address;
Device—
client interface.
4.1.7
The “DHCP” submenu. Active DHCP leases
The DHCP table provides a list of active DHCP leases and their duration.
Interface Name—
interface that the address was obtained from;
Interface Type—
type of the interface;
Hostname—
network device name;
MAC address—
device MAC address;
IP address—
device address in local network that was chosen by router from the pool of IP addresses;
Expires In—
remaining time of the address lease.