R2511-HP MSR Router Series Layer 3 - IP Services Configuration Guide(V5)

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• The interface Ethernet 1/2 of Router and user hosts (Host A, Host B, and Host C) are in another
subnet 2.2.2.0/24.
• The default gateway of Administrator is the IP address 1.1.1.2/24 of the interface Ethernet 1/1 of
Router.
• The default gateway of Host A, Host B and Host C is the IP address 2.2.2.2/24 of the interface
Ethernet 1/2 of Router.
Configure forwarding of directed broadcasts so that user hosts can receive directed broadcasts from the
Administrator to implement Wake on LAN.
Figure 50 Network diagram
Configuration procedure
# Configure IP addresses for Ethernet 1/1 and Ethernet 1/2.
[Router] interface ethernet 1/1
[Router-Ethernet1/1] ip address 1.1.1.2 24
[Router-Ethernet1/1] quit
[Router] interface ethernet 1/2
[Router-Ethernet1/2] ip address 2.2.2.2 24
# Enable Ethernet 1/2 to forward directed broadcasts.
[Router-Ethernet1/2] ip forward-broadcast
After the configurations, if you send a packet whose destination address is the subnet-directed broadcast
address (2.2.2.255) from Administrator, the packet can be received by the user hosts.
Configuring TCP attributes
This section provides information about configuring TCP attributes.
Configuring TCP MSS for the interface
The Max Segment Size (MSS) option informs the receiver of the largest segment that the sender is willing
to accept. Each end announces the MSS it expects to receive during the TCP connection establishment.
The end that receives the MSS value from the other end then limits the size of each TCP segment to be
sent.
• If the size of a TCP segment is smaller than the MSS of the other end, the TCP segment is sent to the
other end without being fragmented.
• Otherwise, it is fragmented according to the MSS before being sent.
Follow these guidelines when you configure TCP MSS of the interface:
1.1.1.1/24
Eth1/1
1.1.1.2/24
Eth1/2
2.2.2.2/24
Router
Administrator
Host A
Host B
Host C