Abstract: Computers sending IP datagrams over an ATM network are generally capable of operating multiple simultaneous virtual circuits over the network. However, in doing so, they normally only set up one virtual circuit to each destination IP address so that in order to test the simultaneous operation of N virtual circuits by a computer under test, N target computers are needed. To enable a single computer (T) to provide the destination endpoints for multiple virtual circuits (SVC) from a computer (M) under test, both computers (M,T) are allocated a plurality of virtual IP addresses (IM(j),IT(i)) and the target computer (T) is additionally provided with a module running address-changing processes (70,71) that avoids the IP layers (20) of both computers from rejecting IP datagrams (25A,25B) addressed with the virtual IP addresses.

Abstract: Computers sending IP datagrams over an ATM network are generally capable of operating multiple simultaneous virtual circuits over the network. However, in doing so, they normally only set up one virtual circuit to each destination IP address so that in order to test the simultaneous operation of N virtual circuits by a computer under test, N target computers are needed. To enable a single computer to provide the destination endpoints for multiple virtual circuits from a computer under test, both computers are allocated a plurality of virtual IP addresses and the target computer is additionally provided with a module running address-changing processes that avoids the IP layers of both computers from rejecting IP datagrams addressed with the virtual IP addresses. As a result, each computer can be addressed with any of a plurality of IP addresses and each will result in the creation of a respective virtual circuit between the computers.