tmnxIPsecTunnelPubTcpMssAdjust

The value of tmnxIPsecTunnelPubTcpMssAdjust specifies the Maximum
Segment Size (MSS) for the TCP traffic in an IPsec tunnel which is
sent from the public network to the private network. The system may
use this value to adjust or insert the MSS option in TCP SYN packet.
              
The TCP MSS adjustment functionality on the public side network is
disabled when the following conditions are met.
1) The value of tmnxIPsecTunnelPubTcpMssAdjust is '-1' or
2) The values of tmnxIPsecTunnelPubTcpMssAdjust and
   tmnxIPsecTunnelEncapIpMtu are both '0'.
              
When the system receives a TCP SYN packet from the public network and
this packet contains an MSS option, the system replaces the MSS option
value with a new MSS when the new MSS is smaller than the MSS option
value.
              
When the system receives a TCP SYN packet from the public network and
this packet does not contain an MSS option, the system inserts one
with a new MSS.
              
The new MSS is calculated based on the following rules.
1) When the value of tmnxIPsecTunnelPubTcpMssAdjust is '0' and
   tmnxIPsecTunnelEncapIpMtu has a non-zero value,
   New MSS = tmnxIPsecTunnelEncapIpMtu - total header size (e.g.,
             encryption, encapsulation, TCP and IP headers)
2) When the value of tmnxIPsecTunnelPubTcpMssAdjust is in the range
   of (512..9000)
   New MSS = tmnxIPsecTunnelPubTcpMssAdjust

MIB

TIMETRA-IPSEC-MIB

OID

.1.3.6.1.4.1.6527.3.1.2.48.6.1.49

Type

column

Access

readwrite

Status

current

Units

octets

Parent

tmnxIPsecTunnelEntry