Override computed tls-mtu = 1427 with conf-mtu = 1406 Processing CSTP header line: 'X-CSTP-Protocol: Copyright (c) 2004 Cisco Systems, Inc.' The Process of Determining the MTU CAN BE Confirmed by the debug output "debug webvpn An圜onnect 1." Shown Below IS a debug output example WHEN the MTU of physical NIC IS 1500, IS 1406 An圜onnect MTU, with DTLS enabled USING aes128-SHA1. If An圜onnect MTU MTU of physical NIC - Overhead, the value of "MTU of physical NIC - Overhead" Will BE applied to the VA.
#Mtu for vpn mac Pc#
Please note that the MTU value configured by DfltGrpPolicy or Custom Group Policy will not be automatically reflected.The MTU value of the physical NIC of the PC will also be considered as the element of determining the MTU.To be specific, When the connection starts using An圜onnect, the MTU value applied to the An圜onnect virtual adapter (VA, hereinafter) will be negotiated between An圜onnect and ASA. The basic value can be computed with the following formula, and with a maximum overhead value of 94 bytes.Ģ0 (IP header) + 8 (UDP header) + 13 (DTLS header) + 8/16 (IV DES / AES) + 1 (CDTP) + 1-8 / 16 (Padding DES / AES) + 20 (MAC) The overhead of DTLS varies by the encryption algorithm and the hashing applicable. Note: You can configure MTU per user by selecting > even when you are using a local user database. In this configuration example, MTU 1300 will be applied only to the users stored in the Group created at step 1. Select the Profile created at step 3 as Authorization Profiles. Click and create an Authorization Policy.Set the Group created at step 1 as Identity Groups to Conditions. Go to > and create a Profile.See the figure below for the configuration example of an attribute.Ĥ. Create a new Group to store the An圜onnect users to which you want to apply the MTU value.Ģ. Here is a configuration example of adding an attribute using Cisco Secure ACS 5.x, provided that the authentication server for An圜onnect users uses the Radius.ġ. This method is useful when you want to apply a different MTU value only for a specific user within the same Group Policy.For example, there is a case where a smaller MTU value (1300) is applied according to the An圜onnect connection environment of the specific user. The MTU value assigned by this attribute takes precedence over the MTU value configured at the Group Policy described at 1-1. There is a way to configure the MTU value using a radius attribute called WebVPN-SVC-DTLS-MTU (SVC-MTU). This Means That the MTU setting value of DfltGrpPolicy Will BE Inherited.To Apply an Original MTU value to the Custom Group Policy, uncheck the Inherit field and enter the value you want to configure. Inherit IS checked as the initial state, as shown in the figure Below. To configure a different MTU value from DfltGrpPolicy to the Custom Group Policy, access An圜onnect Client from ASDM as follows: >. Note that the maximum value configurable is also 1406. 1406 is configured as the initial value of MTU as shown in the below figure. To access An圜onnect Client from ASDM, go to >. Configure basic settings on the An圜onnect MTU A Reconnect Occurs Only After One Minute Since Connected to An圜onnectġ. Settings from DfltGrpPolicy and Custom Group Policyģ-1. Configure Basic Settings on the An圜onnect MTUġ-1.
#Mtu for vpn mac verification#
This Article IS based on the operation verification of ASA 9.1 (4) and An圜onnect 2.Please Note that this unofficial content is merely an explanation of the current implementation, and does not guarantee that it will be the same operation in future.ġ. While it considers the transfer efficiency, various individual customizations are included to make the Settings more Complex.This Document Describes Basic Settings and Operations of An圜onnect MTU, as well as the major failure Cases Associated with it. The MTU value for VPN Client or SVC Client, used to connect to the VPN network, was set to 1300 bytes.With An圜onnect Client, the initial value is set to 1406 bytes.
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