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Robust Path MTU Discovery (RFC 4821) in AIX?

  • 1.  Robust Path MTU Discovery (RFC 4821) in AIX?

    Posted Tue June 03, 2008 01:33 PM

    Originally posted by: woodstea


    Does or will AIX support RFC 4821 style path MTU discovery? I know we can do the old-style (i.e. tcp_pmtu_discover) method, but this is often considered insecure or does not work because ICMP messages are being blocked in the network.

    I believe that the 1500 MTU is one of the most significant bottlenecks facing AIX users today. Without robust path MTU discovery, it's difficult to implement larger frame sizes anywhere but in isolated networks, such as those used for NAS traffic. This means wasted CPU cycles, especially at 1 Gb speeds and beyond. IVE's multi-core scaling helps out here, but this is a lot like building more coal-fired power plants, rather than making appliances, etc. more energy efficient.

    http://staff.psc.edu/mathis/MTU/#pmtud
    http://www.faqs.org/rfcs/rfc4821.html

    Thanks,
    Robert Wood


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