Adjusting Mtu Size Using Asdm; Adjusting Mtu Size Using Cli - Cisco 5505 - ASA Firewall Edition Bundle Administrator's Manual

Viewing AnyConnect Client and SSL VPN Sessions

Adjusting MTU Size Using ASDM

You can adjust the Maximum Transmission Unit size (from 256 to 1406 bytes) for SSL VPN connections
established by the AnyConnect Client by selecting Configuration > Remote Access VPN > Network
(Client) Access > Group Policies > Add or Edit. The Edit Internal Group Policy dialog box opens (fig).
Figure 9-1
Select Advanced > SSL VPN Client. Uncheck the Inherit check box and specify the appropriate value in
the MTU field. The default size for this command in the default group policy is 1406. The MTU size is
adjusted automatically based on the MTU of the interface that the connection uses, minus the
IP/UDP/DTLS overhead.
This setting affects only the AnyConnect Client. The Cisco SSL VPN Client (SVC) is not capable of
adjusting to different MTU sizes. This setting affects AnyConnect Client connections established in SSL
and those established in SSL with DTLS.

Adjusting MTU Size Using CLI

You can adjust the Maximum Transmission Unit size (from 256 to 1406 bytes) for SSL VPN connections
established by the AnyConnect Client by using the svc mtu command from group policy webvpn or
username webvpn configuration mode:
Cisco AnyConnect VPN Client Administrator Guide
9-2
Edit Internal Group Policy Dialog Box
[no] svc mtu size
Chapter 9 Monitoring and Maintaining the AnyConnect Client
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