# limiting outbound packet size

Mike Carns (mcarns@crl.com)
Wed, 15 Jan 1997 16:27:45 PST

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    On Wed, 15 Jan 1997, David Morris wrote:

    > Simply stated (and I don't have all the tech details) it seems that outbound
    > packets larger than a certain size (1500 bytes is what I have heard) block up
    > the outbound connection. People who connect can still send commands to the moo
    > but are unable to see any kind of feedback. (some have been able to page or
    > send moomail blind, etc)

    Well if you're on an ethernet network, the mtu (max transmission unit i
    believe) can be at most 1500, so you shouldn't be able to send packets
    larger then that anyway.

    > I was wondering if there was some way to temporarily hack the server to limit
    > the size of outbound packets to fit within the limit? SOme of us are thinking
    > that maybe the internet software will bundle outgoing packtets anyway it
    > pleases and it doesn't matter what we do.

    I have a very similar system as yours (my uname -a lists the following)
    SunOS scooby 5.4 generic sun4c sparc
    (the only difference being the name and 4m/4c)
    And the only way I know of to set the packet size is the following:
    ifconfig le0 (or whatever your enet interface is..) mtu 1500 (or whatever
    you want the ethernet mtu to be, max is 1500).

    Hope this helps.
    Sincerely,
    mcarns@crl.com
    Mike_Carns@moo.du.org
    Belgarath, archwizard MVMoo