User's Manual Part 2

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30JadeOSUserManual

Address HWaddress Interface Type

192.168.20.1 00:13:1A:A5:CC:80 mgmt 1 Dynamic

192.168.20.15 00:15:C5:F3:35:B2 mgmt 1 Dynamic

192.168.20.152 00:14:22:19:FC:C4 mgmt 1 Dynamic

119.6.100.1 C4:64:13:D1:9A:EA Gi 12/0 Dynamic

192.168.20.226 04:8B:42:10:6C:1C mgmt 1 Dynamic

172.50.3.2 04:8B:42:20:00:F5 Gi 12/2 Dynamic

6.3.2ConfiguringARPProxy

Proxy ARP includes local proxy ARP and proxy ARP. They both reply ARP re‐

quest with interface MAC address, no matter the requestaddress is in existence or

not. But they have differences too. Proxy ARP will reply ARP requestno matterthe

request address is in the same network segment with interface  or not. Local proxy

ARPwillreplywhenARPrequest’soriginaladdress,destinationaddressandinterface

addressareinthesamenetworksegment.

In caseof theTUNNEL broadcast messagesuppressionand DHCPsnooping is open,

clientneed tocommunicate with another clientthat in thesame network segment

butdifferenttunnel,soweneedtocontinuouslybroadcastARPmessagetolookup

another client. In the abovesituation, we can open the local proxy ARPfunction in

JadeOS.Inthisway,JadeOSwillactasARPproxytoensuretheclient’sdatacommu‐

nicationindifferenttunnel,andthesametime,avoidalotofuselessbroadcastmes‐

sagecausedbyrepeatbroadcast.

6.4ConfiguringMTUandTCPMSS

Mtuandtcpmssistheattributeofinterface.

Whenthedatapacketislargerthanmtuvalue,systemwillfragmentdatapacketac‐

cordingtomtuvalue.Fragmentationwillaf fectdataperformance,soyoushouldtry

toavoidfragmentation.

Iftheinterfaceistheattributeoftcpmssandthetcpmssoptionofsynmessageis

largerthanthetcpmssvalueofinterface,systemwill modifythetcpmssoptionof

thissynmessageandupdatetcpchecksumwhentcpsynmessagegoesthroughin‐

sideinterfaceandoutsideinterface.Youshouldtrytoavoidfragmentationforfrag‐

mentationwillaffectdataperformance

Toconfiguremtu,usemtu<68‐9216>commandinconfigmode:

Toconfiguretcpmss,usetcp4mss<4‐65535>commandininterfacemode:

Forexample,configurethemtuandtcp4mssofinterfacegigaethernet1/0 is1460and

1440respectively:

(JadeOS) (config)#interface gigabitethernet 10/1