Chapter 6 • IP features
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address, from an enterprise DHCP server. DHCP requests
received by a satellite router from devices on a connected LAN
are forwarded through the spacelink to the HX gateway, which in
turn, forwards them to an enterprise DHCP server. The responses
are carried over the spacelink to the satellite router and sent out
on the LAN port from which the requests were received.
Note that DHCP requests cannot be relayed from one satellite
router to another, or from the enterprise network to a satellite
router.
The DHCP relay feature allows relaying to multiple DHCP
servers in the enterprise network.
DNS caching
The optional DNS caching feature employs a DNS-caching proxy
on the satellite router to cache resolved DNS requests. Requests
for previously resolved addresses are provided from the cache,
saving the delay and bandwidth required to send the DNS request
across the satellite link for resolution.
DNS caching is enabled on satellite routers using satellite router
profiles configured in the Vision software.
Access Control List
The Access Control List feature controls access from both local
and enterprise/internet side via up to fifty rules if configured from
UEM and twenty rules if configured locally. The feature is
configurable via Vision EMS and, optionally, from the local web
based user interface.
PBR
PBR is a feature that allows parameters to specify the next hop
router to which a packet can be forwarded. A maximum of three
PBR next hop routers can be defined for each LAN interface. For
each router, the VSAT can be configured to either assume that the
router is always available or to periodically check the status of the
next hop routers through RIP or Ping. When PBR is enabled, an
Access Control List rule is declared unavailable if the configured
next hop router is not available.
PBR also allows an alternate router to be specified from the list of
next hop routers. Traffic is forwarded to the next hop router
whenever the spacelink status goes down. The alternate router
functionality is disabled if VADB is enabled on the VSAT.
Next hop routers are meaningful only for “allow” rules.
Note: The DHCP service and DHCP relay features cannot
operate simultaneously. The DHCP server feature is automatically
disabled if DHCP relay is enabled.
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