In these examples, I am using en0 on OS X and eth0 for Linux.

OS X:

xs22:~ admin$ ifconfig en0
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
 inet6 fe80::21e:52ff:fef2:6111%en1 prefixlen 64 scopeid 0x5
 inet 192.168.1.10 netmask 0xffffff00 broadcast 192.168.1.255
 ether 00:1e:22:22:11:11
 media: autoselect (1000baseT <full-duplex>) status: active
 supported media: autoselect 10baseT/UTP <half-duplex> 10baseT/UTP <full-duplex> 10baseT/UTP <full-duplex,hw-loopback> 10baseT/UTP <full-duplex,flow-control> 100baseTX <half-duplex> 100baseTX <full-duplex> 100baseTX <full-duplex,hw-loopback> 100baseTX <full-duplex,flow-control> 1000baseT <full-duplex> 1000baseT <full-duplex,hw-loopback> 1000baseT <full-duplex,flow-control>

It is possible to filter out the command using grep:

xs22:~ admin$ ifconfig en0|grep active
 media: autoselect (1000baseT <full-duplex>) status: active

This output is a bit easier to read without all the additional information.

Linux:

[root@oneiric-01 ~]# ethtool eth2
Settings for eth2:
Supported ports: [ FIBRE ]
Supported link modes: 10000baseT/Full
Supports auto-negotiation: No
Advertised link modes: 10000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: No
Speed: 10000Mb/s
Duplex: Full
Port: FIBRE
PHYAD: 0
Transceiver: external
Auto-negotiation: off
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000004 (4)
Link detected: yes
[root@oneiric-01 ~]#

curl http://ifconfig.me/

The output example is below:

b1:~ oneiric$ curl http://ifconfig.me/
199.193.209.15
b1:~ oneiric$

find /path/to/files -type f -exec md5sum {} \;

The issue seems to be with the support for Green Ethernet.  Here is the fix that worked for me:

5548-SW01(config)# no eee enable

As soon as commiting the change, the interface for the Mac systems came online.

The Mac ethernet ports need to be set to manual in order to access the switch without making the “no eee enable” config change.

Media & Entertainment Scientific Storage http://meetu.ps/fKkqx

We provide IP service out of our New York POP, located in the 111 8th datacenter with Equinix.   Services include metro ethernet, point-to-point service as well as global connectivity to our Los Angeles and European customers.

For some reasons, you may want to modify the TTL (Time to Live) of a DNS Server.

The default TTL is 10800 seconds (3 hours).  To modify the TTL, edit the following file on your OS X DNS Server and replace $TTL 10800 with the $TTL value you desire.  Please note using a TTL value of 0 (zero) is not supported by some systems and is not advised.

The DNS cache on the client systems may need to be flushed to honor the new TTL.  This is done on OS X by using the “dscacheutil -flush” command.

vi /var/named/zones/db.cloudmac.net.zone.apple

Here is an example config file:

dns1:~ root# cat /var/named/zones/db.cloudmac.net.zone.apple
 ;GUID=D521C96D-AA85-4438-A1BC-8B1D7987DCD0
 ;selfResolvingHostname=0

$TTL 300
cloudmac.net. IN SOA dns.cloudmac.net. netopps.cloudmac.net. (
     2011112804    ;Serial
     86400         ;Refresh
     3600          ;Retry
     604800        ;Expire
     345600        ;Negative caching TTL
 ) 

cloudmac.net. IN  NS dns.cloudmac.net.
dns1 IN  A 10.22.100.30
mail IN  A 10.22.100.31
cloudmac.net. IN  MX 0 mail.cloudmac.net.
dns1:~ root#

Run the dig command to confirm the TTL information reflects what you entered:

dns1:~ root# dig mail.cloudmac.net @10.22.100.30

; <<>> DiG 9.6-ESV-R4-P3 <<>> mail.cloudmac.net @10.22.100.30
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 983
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:
;mail.cloudmac.net.        IN    A

;; ANSWER SECTION:
mail.cloudmac.net.    300    IN    A    10.22.100.31

;; AUTHORITY SECTION:
cloudmac.net.        300    IN    NS    dns1.cloudmac.net.

;; ADDITIONAL SECTION:
dns1.cloudmac.net.    300    IN    A    10.22.100.30

;; Query time: 1 msec
;; SERVER: 10.22.100.30#53(10.22.100.30)
;; WHEN: Mon Nov 28 16:47:32 2011
;; MSG SIZE  rcvd: 85

dns1:~ root#

More info is available by following the links below:

Time to live (TTL) – Wikipedia.com

DNS Round Robin – Wikipedia.com

dscacheutil – developer.apple.com

http://bluearc.com/storage-news/press-releases/110907-Hitachi-Data-Systems-Announces-Acquisition-of-BlueArc.shtml

Check CloudMac.net for details.

Operating Systems Offered:

• OS X Snow Leopard (10.6)

• OS X Snow Leopard Server – Unlimited (10.6)

• CentOS Linux

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More information is available on our website:

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