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RTM-ATCA-SXXX Overview
6806800H62B ATCA‐S201InstallationandUseGuide44
4.6.14 Broadcast
< Read/Write > The user may manually assign the broadcast address for a port, if
DHCP is NOT enabled. The broadcast address must be entered using dotted
decimal notation. (e.g. 192.168.1.255)
4.6.15 Gateway
<Read/Write> The user may manually assign the default gateway for a port, if DHCP
is NOT enabled. The default gateway must be entered using dotted decimal
notation. (e.g. 192.168.1.1)
4.6.16 MTU size
<Read/Write> The MTU defaults to 1500 bytes on each IP interface, but the user can
adjusted higher if that size that is also supported by all adapter, switch, and router
devices in the path. Any path component with a smaller MTU will break packets
into pieces (fragment), which can reduce overall system performance. The user may
specify the MTU (Maximum Transmission Unit) for each Ethernet resource.
Linux interface Port Description Max MTU size
/dev/eth0 10/100/1000 — Base 0 (Zone -2) 9586
/dev/eth1 10/100/1000 — Base 1 (Zone -2) 9586
/dev/eth2 10/100/1000 — Management (RTM port) 9586
/dev/eth3 10G — Fabric 0 (Zone-2 XAUI ) 16110
/dev/eth4 10G — Fabric 1 (Zone-2 XAUI ) 16110
MTU defines the maximum size of a packet that the blade may transmit over the
network interface without fragmentation. A large MTU permits the system to send
fewer packets of a larger size to achieve the same network throughput, with
generally less OS and software overhead.
If you are not sure, you can often find the MTU size using a trial-and-error ping
command. First set the MTU to the max, then open a console port, and ping the
destination port, incrementing the size until no response is received:
ping 192.168.1.10 –l 1500 –f
ping 192.168.1.10 –l 4000 –f
ping 192.168.1.10 –l 8000 –f
…
ping 192.168.1.10 –l 16110 –f
4.6.17 MAC address
<Read Only> The Ethernet MAC address is a 48-bit number that identifies the
physical source and destination of the Ethernet 802.3 frame. The address is assigned
by Emerson during manufacturing, and permanently recorded in nonvolatile
memory on the blade.