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New Member

for path MTU discovery

Hi,

to find the correct MTU along the path. a host uses the maximum MTU of the path or the maximum MTU of its outbound interface?

thanks

difei

2 REPLIES
Bronze

Re: for path MTU discovery

Normally a device will use the MTU setting in it, which may be taken from the outbound interface and, unless the DF, Don't Fragment, but is set, each hop will fragment the frame as necessary.

The is however an IOS command, 'ip tcp path-mtu-discovery', to force end to end negotiation of the largest mtu that can be used.

New Member

Re: for path MTU discovery

hi,

at the first time, assumed a host send packet with 576 byte which may be taken from its outbound interface. how it to get the maximum MTU of the path, like 1500byte. so in this case, i guess that it should send packet with 1500byte at the first try.

thanks /difei

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