Re: Change MTU settings on Solaris 5.9

From: Cory Stoker (
Date: 10/13/05

  • Next message: Kenton Smith: "Re: Wireless Security"
    Date: Wed, 12 Oct 2005 18:02:48 -0600

    I think this is what you need but I did not verify it on my Solaris
    box beforehand:

    disable PMTUD:
    # ndd -set /dev/ip ip_path_mtu_discovery 0

    set maximum MSS to 1460:
    # ndd -set /dev/tcp tcp_mss_max 1460

    You can enumerate the options to change by using ndd as well.

    $ man ndd

    Cory Stoker
    ClearNet Security
    On Oct 12, 2005, at 10:28 AM, wrote:
    > Recently a customer of ours has been having an issue w/ remote  
    > login from multiple customers on there network.  Our company  
    > installed, configured and setup A Sun Fire V250. The issue, there  
    > NetAdmin states, "Our customers are not able to login to your /our  
    > Sun Box because the MTU is at the default setting of 1500 and needs  
    > to be 1480 or 1460."  This  I (System Database Admin) believe is  
    > totally wrong.  But to prove a point I would like to check the  
    > current settings and make changes if needed.
    > I read some where before that the changes could be made in /etc/ 
    > networks/interfaces, but not able to locate that directory...
    > any suggestions?
    > Do or do not, there is no try. -Yoda.

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