Re: [nznog] to xtra.co.nz sysadmins

Ewen McNeill wrote:

Some googling turns up several references to "mtu 1514", from various equipment (eg, Cisco loopbacks with a MTU of 1514's, tunnels on various things, PPP interfaces, etc), but it's not clear what made someone consider it a "default".[1][2]

One notes that 1514 is the standard Ethernet IP MTU of 1500, plus the 14 byte Ethernet MAC header, but excluding the 32 bit CRC, preamble or inter-packet gaps. For IP purposes, an MTU of 1514 is just nonsense, but it's the sort of thing that trips up users of, e.g. tcpdump. -- don