Setting MTU sizes

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To set MTU size, use the SMIT fast path, smit chif.

Select the appropriate adapter and enter an MTU value in the Maximum IP Packet Size field.

The ifconfig command can be used to set MTU size (and must be used to set MTU size at 8500). The format for the ifconfig command is:

ifconfig trn NodeName up mtu MTUSize

where trn is your adapter name, for example, tr0.

Another method of setting MTU sizes combines the ifconfig command with SMIT.

  1. Add the ifconfig command for token rings, as illustrated in the previous example, to the /etc/rc.bsdnet file.
  2. Enter the smit setbootup_option fast path. Toggle the Use BSD Style field to yes.