Internet Control Message Protocol (Icmp); Advanced Ip Routing Options - 3Com SuperStack 3 3250 Implementation Manual

Internet Control
Message Protocol
(ICMP)
Advanced IP
Routing Options
Figure 28 ARP Proxy
158.101.1.2
(255.255.0.0)
With proxy ARP enabled the
MAC address for the switch
is returned to Server A when
it ARP's for the IP address of
Server B
With Proxy ARP enabled
the MAC address of Server B
is returned to Server A because
the subnetworks are transparent
Because a router knows only about the next network hop, it is not aware
of problems that may be closer to the destination. Destinations may be
unreachable if:
Hardware is temporarily out of service.
You specified a nonexistent destination address.
The routers do not have a route to the destination network.
To help routers and hosts discover problems in packet transmission, a
mechanism called Internet Control Message Protocol (ICMP) reports
errors back to the source when routing problems occur. With ICMP, you
can determine whether a delivery failure resulted from a local or a remote
problem.
Your Switch has several features which further extend the networking
capabilities of the device. Refer to
the following:
Variable Length Subnet Masks (VLSMs)
Supernetting

Advanced IP Routing Options

Server A
158.101.2.1
(255.255.0.0)
158.101.2.2
(255.255.0.0)
Appendix D for more information on
97
Server B