Avaya J100 Series Installing And Administering page 44

Initial setup and connectivity
The latter case is the default. If the default is invoked, after the DHCP lease expires the phone
continues to broadcast DHCPREQUEST messages for its current IP address, and it sends an
ARP Request for its own IP address every five seconds.
The messages continue to be sent until the device receives a DHCPACK, a DHCPNAK, or an
ARP reply. After receiving a DHCPNAK or ARP reply, the device immediately stops using the
current IP address. The device displays the DHCPNAK: message for five seconds and then, sets
the IP address to 0.0.0.0. Duplicate address detection is no longer performed and the device
enters the DHCP INT state.
Depending on the DHCP application you choose, the application might not immediately recycle
expired DHCP leases. An expired lease might remain reserved for the original client a day or
more. If the client and the DHCP server are in two different time zones, the clocks of the
computers are not in sync, or the client is not on the network when the lease expires, there is time
to correct the situation.
The following example shows the implication of having a reservation period.
Assume that there are two IP addresses, therefore two possible DHCP leases. Assume that there
are three IP devices in the network, two of which are using the two available IP addresses. When
the lease for the first two devices expires, the third device cannot get a lease until the reservation
period expires. Even if the other two devices are removed from the network, the third device
remains without a lease until the reservation period expires.
Parameter configuration through DHCP
Parameter Set to
DHCP lease Option 51, if received
time
DHCP lease Option 58, if received
renew time
DHCP lease Option 59, if received
rebind time
DOMAIN Option 15, if received
DNSSRVR Option 6, if received, which might be a list of IP addresses
HTTPSRVR The siaddr parameter, if that parameter is non-zero
IPADD The yiaddr parameter
LOGSRVR Option 7, if received
MTU_SIZE Option 26
NETMASK Option 1, if received
ROUTER Option 3, if received, which might be a list of IP addresses
SNTPSRVR Option 42
DHCP site-specific option
You can set the values of site-specific configuration parameters through a DHCP option. The
default DHCP option to set the site-specific configuration parameters is 242. You can also use any
August 2018 Installing and Administering Avaya J100 series IP Phones in third-party call control
setup
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