EXHIBIT 10.30

AMENDMENT TO WARRANT AGREEMENT

    This Amendment (the "Amendment") is entered into as of April 21, 2000
between Sprint Corporation, a Kansas corporation (the "Purchaser"), and Hybrid
Networks, Inc., a Delaware corporation (the "Company"), and amends the Warrant
Agreement dated as of September 9, 1999 between the Purchaser and the Company
(the "Warrant Agreement"). Except as otherwise defined herein, the capitalized
terms herein shall have the same meanings as those terms have in the Warrant
Agreement.

    The parties hereto agree as follows:

1.The first three sentences of Section 2(b) of the Warrant Agreement are hereby
amended in their entirety as follows:

    (b) None of the Warrants shall be exercisable until the earliest date on
which the shipment of at least $1,000,000 of products by the Company is
scheduled to be made by the Company, in accordance with the terms of the
Equipment Purchase Agreement, in purchase orders submitted to the Company under
the Equipment Purchase Agreement. On such date, 10% of the Warrants (rounded to
the nearest whole Warrant) shall become exercisable. Thereafter, an additional
10% of the Warrants (rounded to the nearest whole Warrant) shall become
exercisable for each additional $1,000,000 of shipments as are scheduled to be
made by the Company in accordance with the terms of the Equipment Purchase
Agreement, in purchase orders submitted by the Purchaser to the Company under
the Equipment Purchase Agreement, such that the entire amount of Warrants shall
be exercisable when $10,000,000 of such shipments have been so scheduled to be
made.

2.No other amendment is made to the Warrant Agreement. The Warrant Agreement, as
amended as provided in Section 1, continues in full force and effect.

    IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed by their respective officers thereunto duly authorized as of the day
and year first above written.

 
 
HYBRID NETWORKS, INC.
 
 
By: 

--------------------------------------------------------------------------------

Michael D. Greenbaum
Chief Executive Officer
 
 
SPRINT CORPORATION
 
 
By: 

--------------------------------------------------------------------------------

 
 
Its: 

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------