3Com Router 3000 Ethernet FamilyConfiguration Guide Chapter 10 IP Performance Configuration3Com Corporation10-1Chapter 10 IP Performance Configuration10.1 Configuring Maximum Transmission Unit (MTU)MTU size of the interface decides whether the IP packets on the interface need to befragmented.Table 10-1 Configure MTU of the interfaceOperation CommandConfigure MTU of the interface mtu mtu-sizeRestore to the default value of the interface MTU undo mtuThe default value of the interface MTU is 1500 bytes when using Ethernet_II frameformat.10.2 Configuring TCP Packet FragmentationThe parameter of TCP packet fragmentation determines whether the TCP packets areto be fragmented.Perform these commands in interface view.Table 10-2 Configure TCP packets fragmentationOperation CommandEnable TCP packet fragmentation tcp mss valueDisable the TCP packet fragmentation undo tcp mssBy default, TCP packets are not fragmented.10.3 Configuring TCP AttributesTCP attributes that can be configured include:z syn timer: When sending the syn packets, TCP starts the syn timer. If responsepackets are not received before syn timeout, the TCP connection will beterminated. The range of syn timer timeout time is 2 to 600 seconds, and thedefault is 75 seconds.z fin timer: When the TCP connection state turns from FIN_WAIT_1 to FIN_WAIT_2,fin timer will be started. If FIN packets are not received before fin timer timeout, the
