Symptoms

TMM crashes when the maximum transmission unit (MTU) or 'Use PMTU' setting is changed while passing IPsec traffic.

Impact

Traffic disrupted while tmm restarts.

Conditions

-- IPsec tunnel configured and passing traffic. -- The MTU or 'Use PMTU' setting for the IPsec tunnel (in interface mode) is changed.

Workaround

Do not change MTU or PMTU settings for the tunnel while it is passing traffic. The settings can be changed while passing traffic, but TMM may crash very soon after the change. If the settings are changed and TMM does not crash soon after, then it will not spontaneously crash at some later point.

Fix Information

None

Behavior Change