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16 CHAPTER 1: INITIAL CONFIGURATION
Enabling Secure
Copy (SCP) and
Secure Shell (SSH)
Commands
UMS uses shell scripts to synchronize the two servers. These scripts use
the SCP and SSH commands. For these commands to work properly in
this environment, you must configure each UMS server so that the
commands do not prompt for a password.
Perform these steps on the voipbox1 and voipbox2 servers as user app:
1 To create the private and public keys, enter this command:
ssh-keygen -t dsa
2 When you are prompted for a key location, press Enter to accept the
default.
3 When you are asked for a passphrase, press Enter to leave the
passphrase blank.
Perform these steps on the designated server only, as user app:
1 On voipbox1, copy the public key to the voipbox2 using this command:
cat ~app/.ssh/id_dsa.pub | ssh app@voipbox2 "cat - >> ~app/.ssh/authorized_keys"..
2 On voipbox2, copy the public key to the voipbox1 using this command:
cat ~app/.ssh/id_dsa.pub | ssh app@voipbox1"cat - >> ~app/.ssh/authorized_keys"..
Network Time
Protocol (NTP)
Configuration
Intelligent Mirroring requires that the clocks on the two systems be
synchronized to within 1 second.
3Com recommends that you use an external NTP server to maintain time
synchronization with Universal Time.
Configuration To configure Network Time Protocol on the two systems:
1 On the voipbox1 system, create the /etc/ntp.conf file.
2 Edit the file and add these lines:
server 127.127.1.1
fudge 127.127.1.1 stratum 8
peer voipbox2
The IP address 127.127.1.1 designates the local oscillator (clock). This
entry is required. If no external NTP server is configured or available, the
two systems use the local oscillator. The fudge command sets the local