Which addresses are reserved depends on the size of the subnet and when the allocation was made the table below summarises the different schemes in use (the scheme names are internal terms to refer to the layout).
UDN edge address organisationįor subnets routed directly by the UDN, some of the addresses are reserved for UDN use. To the UDN routers, it appears that the client devices are directly connected to the outside VLAN and do not need any special configuration to route traffic through the firewall. The firewall responds to the UDN routers on behalf of client devices and selectively permits or denies traffic between this outside VLAN and an internal institutional inside or trusted VLAN where the client devices are connected. This type of connection is also used with proxy ARP firewalls as the outside or untrusted VLAN. The subnet(s) can be public and/or UDN-wide private, including a mix of the two types. The VLAN is usually taken from the PoP and carried through the institutional network directly to the edge ports serving networked client devices such as computers and printers. The most common and simplest type of connection has the IP subnet(s) used by the institution presented directly on the VLAN served by the UDN router(s). Traffic between sites will be routed across the UDN backbone. It should be noted that a VLAN/subnet is only routed to a single PoP switch and cannot be extended to other sites. This is the additional routed VLAN service and is described separately. Most institutions have all of their IP addresses delivered across a single VLAN, but they can request that their routed IP service be split across multiple VLANs (in addition to any service VLANs for VoIP clients, University Wireless Service access points or Managed Cluster Services, etc.).
In practice, the configuration can be a hybrid of these models but care must taken by the local network manager to ensure traffic is routed correctly. routed link - the VLAN provides a routed connection between an institutional router or firewall and the upstream UDN router.computers, printers, etc.), perhaps with a proxy ARP firewall edge - the VLAN provides a direct connection for edge devices (e.g.The IP configuration on the institutional VLAN presented on the PoP switch typically follows one of two models: Directed broadcast forwarding (for Wake-on-LAN).Inbound redundancy via first hop (gateway) redundancy.Traffic between public and private addresses on the same VLAN.Multinetting and proxy ARP optimisation.The content of this page is of a technical nature and a good understanding of TCP/IP is required to understand some of details the intended audience is institutional network managers. This page describes how these VLANs and subnets are configured, including how redundant routing is configured. An institution connects to the University Data Network (UDN) physically through one or more interfaces on its PoP switch and logically through one or more VLANs which carry the IP subnets used by the institution, either directly or as a routed link between the UDN router and the institutional router.
0 kommentar(er)
