All MIBs › CLAB-GRE-MIB › clabGRETunnelTcpMssClamping
clabGRETunnelTcpMssClamping
Module: CLAB-GRE-MIB
OID (symbolic): CLAB-GRE-MIB::clabGRETunnelTcpMssClamping
OID (numeric): 1.3.6.1.4.1.4491.4.3.1.3.1.18
Node type: OBJECT-TYPE
Type: Unsigned32
Access: read-create
Description: Specifies whether TCP MSS clamping is enabled on the tunnel. 0 disables clamping, 1 clamps the MSS depending on the interface MTU. A value > 1 will be used as clamping size. See Reference: RFC 4459
What is clabGRETunnelTcpMssClamping?
This Unsigned32 object (0-1420) controls TCP MSS clamping on the tunnel per RFC 4459, where 0 disables clamping, 1 clamps the MSS based on the interface MTU, and any value above 1 is used directly as the clamp size. An engineer enables it to prevent oversized TCP segments from causing fragmentation issues across the GRE tunnel's reduced effective MTU. For example, setting this to 1 lets the device automatically clamp TCP MSS to fit within the tunnel's MTU, avoiding path-MTU-related connectivity problems for TCP sessions traversing the tunnel.
OID Breakdown
Upper-level ancestors (8 from the standard OID tree / other modules)
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | AirPair-MIB |
| 1.3.6 | dod | AirPair-MIB |
| 1.3.6.1 | internet | AirPair-MIB |
| 1.3.6.1.4 | private | AirPair-MIB |
| 1.3.6.1.4.1 | enterprises | AirPair-MIB |
| 1.3.6.1.4.1.4491 | cableLabs | CLAB-DEF-MIB |
| 1.3.6.1.4.1.4491.4 | clabCommonMibs | CLAB-DEF-MIB |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.4491.4.3 | clabGREMib | CLAB-GRE-MIB |
| 1.3.6.1.4.1.4491.4.3.1 | clabGREObjects | CLAB-GRE-MIB |
| 1.3.6.1.4.1.4491.4.3.1.3 | clabGRETunnelTable | CLAB-GRE-MIB |
| 1.3.6.1.4.1.4491.4.3.1.3.1 | clabGRETunnelEntry | CLAB-GRE-MIB |
| 1.3.6.1.4.1.4491.4.3.1.3.1.18 | clabGRETunnelTcpMssClamping | CLAB-GRE-MIB |