Emerson ATCA-S201 manual Broadcast, Gateway, MTU size, MAC address

RTM-ATCA-SXXX Overview

4.6.14Broadcast

<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)

4.6.15Gateway

<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.

6806800H62B ATCA‐S201 Installation and Use Guide 44