Archive for January, 2011
Tonight I finally got around to Readhanging the site a little. I have gone with a new theme to take advantage of some of the updates. Also, I finally got my twitter link on the site. Next, Facebook and Tumblr.
To display the network interface information for a particular network interface in Snow Leopard (not sure about other versions) use the following:
ipconfig getpacket interface
For example,
# ipconfig getpacket en0
op = BOOTREPLY
htype = 1
flags = 0
hlen = 6
hops = 0
xid = 446704316
secs = 0
ciaddr = 172.18.32.24
yiaddr = 172.18.32.24
siaddr = 0.0.0.0
giaddr = 0.0.0.0
chaddr = 0:1e:c2:f:1b:45
sname = dhcp.domain.com
file =
options:
Options count is 8
dhcp_message_type (uint8): ACK 0x5
server_identifier (ip): 172.18.10.45
lease_time (uint32): 0x15180
subnet_mask (ip): 255.255.0.0
router (ip_mult): {172.18.10.1}
domain_name_server (ip_mult): {172.18.10.65, 172.18.10.66}
domain_name (string): domain.local
end (none):
This gives you much more information than a standard ifconfig command. The command above will display all the current options for the interface. You can narrow this down with the getoption parameter.
Yes, I know it’s old and retired and nobody cares, but I still have to support a couple Alphas running Tru64 and I always seem to forget this.
To display the status of the CPUs, use the psrinfo command. This will tell you which CPUs are online or offline.
# psrinfo
0 on-line since 01/27/2011 09:35:36
1 on-line since 01/27/2011 09:35:36
2 on-line since 01/27/2011 09:35:36
3 on-line since 01/27/2011 09:35:36
4 on-line since 01/27/2011 09:35:36
5 on-line since 01/27/2011 09:35:36
8 on-line since 01/27/2011 09:35:36
9 on-line since 01/27/2011 09:35:36
12 on-line since 01/27/2011 09:35:36
13 off-line since 01/27/2011 09:53:52
To put a CPU offline or online use the psradm command.
Offline:
# psradm -f CPU NUMBER
For example, when I turn off CPU 13 listed above, I used the following:
# psradm -f 13
Online:
# psradm -n CPU NUMBER
Ran into an interesting issue when accessing a Windows 2003 domain controller from a Windows 2008 server via a gigabit interface connected to gigabit switch.
I was trying to access a Windows 2003 domain controller (HP BL460c) attached to a 1000Mb switch (Cisco 2960) from a Windows 2008 blade server (BL460c) connected to the same 1000Mb switch (Cisco 2960). Performance was terrible. I was having trouble accessing shares on the 2003 DC and the Network Policy Server was not responding to authentication requests when the server had a secure channel to this DC. However, when I had a secure channel to another Windows 2003 DC (HP DL380) connected to a 100Mb switch (Cisco 3550), I had no problems. The solution was to simply install the QoS Packet Scheduler for the Windows 2003 DC (BL460c). This took care of the issue.
The following command will display the current FSMO roles in a domain:
netdom query FSMO
To display the current Primary domain controller in a domain:
netdom query PDC
To display the current domain controllers for a domain:
netdom query DC
To display trust relationships:
netdom query TRUST
I have used the following to check when domain controller a member server has a secure channel with:
C:\>netdom verify SERVERNAME
The secure channel from SERVERNAMEto the domain DOMAINAME has been verified. Th
e connection
is with the machine \\SERVERNAME.DOMAINNAME.
The command completed successfully.
Furthermore, you can use the following to reset the secure channel:
C:\>NETDOM RESET SERVERNAME
The secure channel from SERVERNAME to the domain DOMAINNAME has been reset. The c
onnection is
with the machine \\SERVERNAME.DOMANANAME.
The command completed successfully.
I have used similar commands on older OSs, but I am not sure if they were part of the install or part of a resource kit. I have tested these on Windows 2008 and Windows 7.
To put your iPhone in field test mode, so that you can see the actual signal strength numerically:
Open the phone application.
Enter the following from the keypad: *3001#12345#*
Press call.
This will put in field test mode, and will replace your bar signal strength with the numerical representation.
Evidently, this has been blocked in a recent version of IOS. I did this from a jailbroken IOS version 4.1 (8B117) with baseband 01.59.00.