Dhcp/Bootp Relay; Rip - Avaya P333R User Manual

Chapter 1 Overview
• Determine if the packet source or destination TCP/UDP port number falls
within a pre-defined range.
• Using the ACK bit of the TCP header.
The Avaya P333R access control rules are set-up using the Command Line Interface
and Avaya's RealNet Rules central policy management application.

DHCP/BOOTP Relay

The P333R supports the DHCP/BOOTP Relay Agent function. This is an application
that accepts DHCP/BOOTP requests that are broadcast on one VLAN and sends
them to a DHCP/BOOTP server that connects to another VLAN or a server that
may be located across one or more routers that would otherwise not get the
broadcast request. The relay agent handles the DHCP/BOOTP replies as well,
transmitting them to the client directly or as broadcast, according to a flag in the
reply message. Note that the same DHCP/BOOTP relay agent serves both the
BOOTP and DHCP protocols.
When there is more than one IP interface on a VLAN, the P333R chooses one of the
IP addresses on this VLAN when relaying the DHCP/BOOTP request. The DHCP/
BOOTP server then uses this address to decide from which subnet the address
should be allocated.
When the DHCP/BOOTP server is configured to allocate addresses only from a
single subnet among the different subnets defined on the VLAN, you may need to
configure the P333R with the relay address on that subnet so that the DHCP/
BOOTP server can accept the request.
DHCP/BOOTP Relay in P333R is configurable per VLAN and allows for two
DHCP/BOOTP servers to be specified. In this case, it duplicates each request, and
sends it to both servers. This provides redundancy and prevents the failure of a
single server from blocking hosts from loading.
DHCP/BOOTP Relay in P333R can be enabled or disabled.

RIP

P333R supports the widely used RIP routing protocol (both RIPv1 and RIPv2). The
RIPv1 protocol imposes some limitations on the network design with regard to
subnetting. When operating RIPv1, you must not configure variable length subnet
masks (VLMS). Each IP network must have a single mask, implying that all subnets
in a given IP network are of the same size. Also, when operating RIPv1, you must
not configure supernets, which are networks with a mask smaller than the natural
net mask of the address class, such as 192.1.0.0 with mask 255.255.0.0 (smaller than
the natural class C mask which is 255.255.255.0). For detailed descriptions of RIP
refer to the standards and published literature.
RIPv2 is a new version of the RIP routing protocol, not yet widely used but with
some advantages over RIPv1. RIPv2 solves some of the problems associated with
10 Avaya P333R User's Guide