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Forum Replies

  1. Rene,
    Hi. Great explanations. Couple quick clarifications.

    1. You mention ‘The MSS value isn’t synchronized between hosts, it can be different for each direction’ - I thought this gets negotiated as a part of the 3 way handshake? Are you saying in your example above if say set “ip tcp adjust-mss 1360” on the f0/1 of R2 and then set “ip tcp adjust-mss 1460” on the f0/1 of R1 then it wouldnt negotatiate down to the lowest common MSS and hence break?

    2. Assuming I am using GRE over IPSEC with transport mode I looked at a recent customer network in which the tunnel i

    ... Continue reading in our forum

  2. Hi Rene,

    As you mention the interface MTU for both end doesn’t need to be same.

    If let say R1 with interface MTU 9000 and R2 with interface MTU 1500. It will not cause any issue?

    Because the R1 sending 6 times more packet in one frame, R2 will able to receive it without any problem?

    Davis

  3. Hi Laz,

    thanks for your help!

    Regards
    Florian

  4. Hello Laz/Rene,
    I have a question and I am going to use the below topology.

    https://cdn-forum.networklessons.com/uploads/default/original/1X/dd203a1ce79ad4d50ec2a2c92be7a9e63c01daf4.png

    Ques: Does MTU get checked on the inbound interface or outbound interface or inbound and outbound interface both?

    In this topology, PC-1 is sending a frame of 9000 Bytes to PC-2. MTU is configured according to the picture. Since MTU is 9216 on the inbound interface of ROUTER-1, the frame should be passed through this interface. What will Router-1 do before it sends the same fr

    ... Continue reading in our forum

  5. Hello AZM

    The MTU is checked on both inbound and outbound. So in your scenario, if the MTU on the outbound interface of Router 1 is 1500, then the frame of 9000 bytes that was sent and was successfully egressed through the inbound interface, will be fragmented. (unless the DF bit is set to 1 where it will be dropped).

    I hope this has been helpful!

    Laz

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