D-Link xStack DGS-3610 Series Configuration Manual page 226

Chapter 19 IP Address and Service Configuration
19.2.2.2 Enabling ICMP Redirect Messages
Routes are sometimes less than optimal it is possible for the device to be forced to resend a
packet through the same interface on which it was received. If the router resends a packet
through the same interface on which it was received, it sends an ICMP redirect message to
the data resource to inform the data resource that the gateway reached to this destination
address is another router in the same subnet. Therefore the data resource will transmit the
packets based on the optimized path afterwards. This feature is enabled by default.
To enable the ICMP redirect messages execute the following command in interface
configuration mode:
Command
DGS-3610(config-if)# ip redirects
DGS-3610(config-if)# no ip redirects
19.2.2.3 Enabling ICMP Mask Reply Messages
Occasionally, network devices need to know the subnet mask for a particular subnetwork in
the Internet. To obtain this information, such devices can send ICMP mask request
messages. ICMP mask reply messages are sent in reply from devices that received the
requested information. Our product can respond to ICMP mask request messages. This
function is enabled by default.
To enable ICMP mask reply messages, use the following command in interface configuration
mode:
Command
DGS-3610(config-if)# ip mask-reply
DGS-3610(config-if)# no ip mask-reply
19.2.2.4 Setting the IP MTU
All interfaces have a default MTU (Maximum Transmission Unit) value. All the packets which
are larger than the MTU have to be fragmented before sending. Otherwise it is unable to be
forwarded on the interface.
Our product allows you to adjust the MTU on an interface. Changing the MTU value can
affect the IP MTU value, and the IP MTU value will be modified automatically to match the
new MTU. However, if ajust the value of the IP MTU, the MTU of the interface will not change
with it..
Also, all device interfaces on a physical network must keep coherence with the MTU value
for the same protocol.
19-12
DGS-3610 Series Configuration Guide
Function
Enable the sending of ICMP redirect messages. It
is enabled by default.
Disable the sending of ICMP redirect messages.
Function
Enable the mask reply messages.
Disable the mask reply messages.