The output of netstat -rn shows the value 0 for the MSS. What is the meaning of this value?

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The output of the netstat -nr command usually shows something like this:

# netstat -nr
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface   U         0 0          0 eth0     U         0 0          0 eth0         192.16...

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