Enabling Reception And Forwarding Of Directed Broadcasts To A Directly Connected Network - H3C S5600 SERIES Operation Manual

synwait timer: When sending a SYN packet, TCP starts the synwait timer. If no response packets
are received before the synwait timer times out, the TCP connection is not successfully created.
finwait timer: When the TCP connection is changed into FIN_WAIT_2 state, finwait timer will be
started. If no FIN packets are received within the timer timeout, the TCP connection will be
terminated. If FIN packets are received, the TCP connection state changes to TIME_WAIT. If
non-FIN packets are received, the system restarts the timer from receiving the last non-FIN packet.
The connection is broken after the timer expires.
Size of TCP receive/send buffer
Follow these steps to configure TCP attributes:
To do...
Enter system view
Configure TCP synwait timer's
timeout value
Configure TCP finwait timer's
timeout value
Configure the size of TCP
receive/send buffer
Enabling Reception and Forwarding of Directed Broadcasts to a Directly Connected
Network
Directed broadcasts refer to broadcast packets sent to a specific network. In the destination IP address
of a directed broadcast, the network ID is the ID of network where the receiving interface resides and
the host ID is all-ones. Enabling the device to receive directed broadcasts will give hackers an
opportunity to attack the network, thus bringing forth great potential dangers to the network. Therefore,
the reception and Forwarding of directed broadcasts to a directly connected network is disabled on
S5600 series Ethernet switches by default. However, you should enable the feature when:
Using the UDP Helper function to convert broadcasts to unicasts and forward them to a specified
server.
Using the Wake on LAN function to forward directed broadcasts to a host on the remote network.
Follow these steps to enable the switch to receive and Forwarding directed broadcasts:
To do...
Enter system view
Enable the device to receive
directed broadcasts
Enter VLAN interface view
Enable the device to forward
directed broadcasts
Use the command...
system-view
tcp timer syn-timeout
time-value
tcp timer fin-timeout
time-value
tcp window window-size
Use the command...
system-view
ip forward-broadcast
interface Vlan-interface
vlan-id
ip forward-broadcast
[ acl-number ]
2-2
Remarks
—
Optional
75 seconds by default.
Optional
675 seconds by default.
Optional
8 kilobytes by default.
Remarks
—
Required
Disabled by default.
—
Required
Disabled by default.