CLI Guide - WatchGuard Technologies
CLI Guide - WatchGuard Technologies
CLI Guide - WatchGuard Technologies
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CHAPTER 3: Configuration Mode Commands<br />
mss_adjustment<br />
WG#config<br />
WG(config)#system <br />
WG(config-system)#mss_adjustment<br />
mss_adjustment [auto| limit_to | disable]<br />
## limit_to range - 40-1460 bytes<br />
Effect<br />
Sets the TCP Maximum Segment Size for the<br />
system. This feature works in conjunction with the<br />
MTU settings to limit the size of packets, if<br />
configured. This feature overcomes the following<br />
problems:<br />
- Oversized packets can result in fragmentation,<br />
degrading VPN performance.<br />
- Proxies may require MSS adjustment to prevent<br />
fragmentation.<br />
- Some older systems do not support MTU to<br />
regulate packet size. This feature works along<br />
with MTU; it does not replace MTU.<br />
Arguments<br />
auto<br />
Auto adjustment calculates the MSS automatically,<br />
using the following calculations:<br />
Determines the lesser value of the input port MTU<br />
and the output port MTU. Subtracts packet<br />
overhead, including IP and TCP addressing,<br />
VLAN, ESP, PPPoE, AH, and UDP encapsulation.<br />
The result is then rounded down to the next lower<br />
multiple of 8 bits (8-bit aligned) to determine the<br />
size in bytes that is required for packet<br />
112 <strong>WatchGuard</strong> Vclass 5.1