RadiSys SEG-100 Administration Manual
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Contents
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11I-WLAN181ChargingThis is a set of 16 vendor‐specific flags that specify vendor‐specific triggers to send to a GGSNwhen establishing GTP Tunnels.In practice, many of the above settings don’t need to be changed for many I‐WLANdeployments since the default values are appropriate.Interface selection for GTP tunnelsThe Ethernet interface where a GTP tunnel starts is not specified in the GTP tunnel definition.The interface is determined by the SEG as follows:• The LocalID of the IPsec tunnel is resolved to the IP address of the GGSN using theconfigured DNS server.• The GGSN IP address is then looked up in the routing table to determine which Ethernetinterface will be used.• The defined interface stitching between the IPsec tunnel and the GTP tunnel causes theSEG to set up a new GTP tunnel on that Ethernet interface.If the IPsec tunnel LocalID is not specified in the tunnel definition, the IDr sent by the client isinstead resolved on its own by the DNS server to obtain the GGSN IP address. If both areavailable, the logical intersection of the two is used.Interface stitchingThe SEG feature of Interface Stitching is important to implementing I‐WLAN. It involves tightlycoupling together a pair of SEG interfaces so that they have the following characteristics:• Arriving traffic at one interface becomes the exiting traffic at the other in the pair withoutreference to routing tables.• Traffic flows are still subject to normal rule sets such as IP rules.• One interface in the pair cannot function without the other. When the interface pairconsists of an I‐WLAN IPsec tunnel and a GTP tunnel (a tunnel is a type of interface in theSEG), one cannot function without the other. Should the IPsec tunnel be taken down, thestitched GTP tunnel will also not function.If multiple I‐WLAN tunnels are configured there needs to be a GTP tunnel for every I‐WLAN IPsec tunnel as these can only be stitched together on a one‐to‐one basis. |
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