HP 600 Series, Services And Applications

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16. The local router receives the TCP ack sync packet for node A; if it is
not in the ARP cache, it sends a VNA request (and ARP, if it is
enabled) for node A’s station address.
17. Node A replies to the router with a VNA with its station address.
18. The local router sends the TCP ack sync packet to node A’s station
address.
19. Node A does a lookup of the station address and transmits a TCP ack
packet to node B’s IP address to the router’s station address.
20. The TCP ack is routed to the remote router.
21. The remote router checks its ARP cache then sends the TCP ack to
node B’s station address.
Scenario 2
A proxy server is used in this scenario.
Each router is configured for IP routing only.
Node A wants to set up a TCP connection to node B, which is on the
other side of the network.
Probe is enabled on the routers.
There is a Probe proxy server on each subnet.
The steps required to establish the connection are as follows:
1. Node A wants to connect to node B, checks the Nodal Registry, and
does not have an entry for node B. It sends out a Probe name
request.
2. The name request is dropped by the local router.
3. After no response, node A sends out a proxy request.
4. The proxy server responds with the IP address of node B.
5. Node A then sends a VNA request using node B’s IP address.
Steps 6 through 21 are the same as those in scenario 1.
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A Primer on HP Probe
Connection Scenarios
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