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Load balancing virtual server on VLAN 10 LBVS-1 IP address: 203.0.113.15
Protocol: HT TP
Port: 80
Bound services: SVC-S1, SVC-
S2
MSS: 1460
Entity Name Details
Following is the traffic flow of CL1's request to S1 in this example:
1. Client CL1 creates a 200-byte HTTP request to send to virtual server LBVS-1 of NS1.
2. CL1 opens a connection to LBVS-1 of NS1. CL1 and NS1 exchange their respective TCP MSS values while establishing the
connection.
3. Because NS1's MSS is larger than the HTTP request, CL1 sends the request data in a single IP packet to NS1.
1. Size of the request packet = [IP Header + TCP Header + TCP Request] = [20 + 20 + 200] = 240
4. NS1 receives the request packet at interface 10/1 and then processes the HTTP request data in the packet.
5. LBVS-1's load balancing algorithm selects server S1, and NS1 opens a connection between one of its SNIP addresses and
S1. NS1 and CL1 exchange their respective TCP MSS values while establishing the connection.
6. Because S1's MSS is larger than the HTTP request, NS1 sends the request data in a single IP packet to S1.
1. Size of the request packet = [IP Header + T CP Header + [TCP Request] = [20 + 20 + 200] = 240
Following is the traffic flow of S1's response to CL1 in this example:
1. Server S1 creates an 18000-byte HT TP response to send to the SNIP address of NS1.
2. S1 segments the response data into multiples of NS1's MSS and sends these segments in IP packets to NS1. These IP
packets are sourced from S1’s IP address and destined to the SNIP address of NS1.
Size of the first two packet = [IP Header + TCP Header + (TCP segment=NS1’s MSS size)] = [20 + 20 + 8960] = 9000
Size of the last packet = [IP Header + TCP Header + (remaining TCP segment)] = [20 + 20 + 2080] = 2120
3. NS1 receives the response packets at interface 10/2.
4. From these IP packets, NS1 assembles all the T CP segments to form the HTTP response data of 18000 bytes. NS1
processes this response.
5. NS1 segments the response data into multiples of CL1’s MSS and sends these segments in IP packets, from interface
10/1, to CL1. These IP packets are sourced from LBVS-1’s IP address and destined to CL1’s IP address.
Size of all the packet except the last = [IP Header + TCP Header + (TCP payload=CL1’s MSS size)] = [20 + 20 + 1460]
= 1500
Size of the last packet = [IP Header + TCP Header + (remaining TCP segment)] = [20 + 20 + 480] = 520
Configuration Tasks
On the NetScaler SDX Management Service, navigate to Configuration > System > Interfaces page. Select the required
interface and click Edit. Set the MTU value and click OK.
Example
Set the following MTU values:
For 10/1 interface as 1500
For 10/2 interface as 9000
Log on to NetScaler instance and use the NetScaler command line interface to complete the remaining configuration
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