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NOTE: This count is maintained even when the protection functions are disabled.
The value indicates the count of packets that would have been rejected if the
protections were enabled. Providing this information can help determine whether
attacks are occurring.
PMTUD information Information regarding path MTU discovery
PMTUD Status of path MTU discovery on the virtual router: enabled
or disabled
Administrative Minimum MTU Minimum MTU that is enabled on any
connection; a value of " none" indicates that the minimum is zero (0)
Administrative Maximum MTU Maximum MTU that is enabled on any
connection; a value of " none" indicates that the maximum is 65535
Timer 1 Amount of time the virtual router waits after receiving an ICMP
Too Big message before attempting to increase the path MTU
Timer 2 Amount of time the virtual router waits after successfully
increasing the MTU before attempting to increase it more
# ICMP TooBigs Number of ICMP Too Big messages that the router has
received. When PMTU is disabled, this counter does not increase.
# ICMP TooBigs for unk. connection Number of ICMP Too Big messages
that the router has received for TCP connections that do not exist. When
PMTU is disabled, this counter does not increase.
PMTU Increase Attempts Number of attempts the router has made to
increase the PMTU
Black Hole Detect Threshold Number of successive transmissions that
must occur on a connection before that connection treats retransmissions
as indications that something is wrong
Override MSS MSS that is advertised to peers, overriding the MSS that
is derived from the interface MTU. This line does not appear in the output
if you do not set the value.
MTU/MSS information Information regarding path MTU/MSS
PMTU Status of MTU/MSS on this virtual router: enabled or disabled
MSS in effect MSS currently being used for transmission to the peer.
This number changes while various network events occur to cause the
router to increase or decrease its estimate of the MSS.
Calculated MSS to peer MSS that path MTU discovery has calculated
(if PMTUD is enabled) to the peer
MSS received from peer MSS that the peer received in a TCP MSS
option. If no option is received, the value is zero (0).
Chapter 1: Configuring IP
115
Monitoring IP
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