ip tcp adjust-mss and ip mtu

[amenash123]

hi

i would like to know what the diffrence between the ip tcp adjust-mss command to ip mtu command.

when i need to config the first one command and when i need to config the second.

thanks

[leighharrison]

Hi there,

ip mtu is for the physical packet size sent out of the interface, this needs to be the same on both sides of the interface for this to work.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123tcr/123tip1r/ip1_i2gt.htm#wp1163967

ip tcp adjust-mss is for the TCP SYN packets that go through the interface.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123tcr/123twr/wan_i1gt.htm#wp1056884

Remember - this is for TCP packets and is for the layer 3 packet. The ip mtu is for the layer 2 frame size. Therefore the size of your adjust-mss needs to take the layer 2 header into account.

Regards

LH

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