Chapter 5: Branch Gateway Services; Ipv6 Support - Avaya G450 Overview And Specification

Chapter 5: Branch Gateway services

Branch Gateway provides various services, including the following:

• IPv6 support

• Telephony services
• Physical media services
• Media Gateway Controller (MGC) support
• Audio and video features
• LAN and WAN services
IPv6 support
Internet Protocol version 6 (IPv6) is a successor to IPv4. IPv6 supports 128-bit addressing,
allowing a larger number of IP addresses. IPv6 also enhances security, simplicity of configuration,
and routing performance. IPv6 can coexist with IPv4 networks, facilitating the transition process.
The Internet Engineering Task Force (IETF) published RFC 2460 defines IPv6.
Note:
Some Branch Gateway features are not supported in IPv6.
Addressing
IPv6 provides about 3.4x10
Network Address Transitions (NAT), that are used to relieve IP address exhaustion. IPv6
addresses are normally written as hexadecimal digits with colon separators. For example:
2005:af0c:168d::752e:375:4020. The double colon "::" represents a string of zeroes, according to
RFC4291.
Routing
IPv6 simplifies the routing process in the following ways:
• Simplified packet header, despite enhanced functionality.
• IPv6 routers do not perform fragmentation. This is carried out by IPv6 hosts.
• IPv6 routers do not need to recompute a checksum when header fields change.
• Routers do not need to calculate the time a packet spent in the queue.
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unique IP addresses. This eliminates the IPv4 mechanisms, such as
Avaya G450 Branch Gateway Overview and Specification
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