Exhibit 21.1 SHIVA CORPORATION LIST OF SUBSIDIARIES as of February 24, 1998 State or Jurisdiction of Name Incorporation Shiva Corporation Massachusetts Shiva Credit Corporation Massachusetts Shiva Foreign Sales Corp. St. Thomas, U.S. Virgin Islands Shiva Securities Corporation Massachusetts Spider Systems Inc. Massachusetts Shiva Europe Holdings I B.V. Netherlands Shiva Europe Limited United Kingdom Spider Shiva International Systems France Shiva Corporation South Africa (Proprietary) Limited South Africa Shiva Worldwide Holdings Ltd. Delaware Shiva Andina Limitada Colombia Shiva Australia Pty Ltd Australia Shiva do Brasil Ltda Brazil Shiva Canada Inc. Canada Shiva Communications Hong Kong Ltd. Hong Kong Shiva Communications Singapore Pte Ltd Singapore Shiva Japan Ltd Japan