Document:

EXHIBIT 10.28
                                                                   -------------

                   AMENDMENT NO. 1 TO REIMBURSEMENT AGREEMENT

         AMENDMENT NO. 1 dated as of the 5th day of March, 2003 by and among,
the Guarantors party hereto, DSL.net, Inc., a Delaware corporation (the
"Obligor") and VantagePoint Venture Partners III (Q), L.P., a Delaware limited
partnership ("VantagePoint") as the administrative agent for the Guarantors to
that certain Reimbursement Agreement (as defined below).

         WHEREAS, the Obligor, the Guarantors party thereto and VantagePoint, as
administrative agent are parties to that certain Reimbursement Agreement, dated
as of December 27, 2002 (the "Reimbursement Agreement");

         WHEREAS, pursuant to Section 8(c) thereof, the Reimbursement Agreement
may be amended with the written consent of the Obligor and the Guarantors;

         WHEREAS, prior to the date of this Amendment No. 1, the Guarantors had
provided Six Million One Hundred Thousand Dollars in Guaranties in connection
with the Reimbursement Agreement;

         WHEREAS, the Obligor has requested, and VantagePoint has agreed, to
amend its Guaranty to increase its guaranty obligations under the Guaranty by an
additional Three Million Dollars ($3,000,000) to support certain obligations of
Obligor under a Revolving Credit and Term Loan Agreement, dated as of December
13, 2002, as amended, between the Obligor and Fleet National Bank (the "Credit
Agreement"); and

         WHEREAS, the parties hereto desire to amend the Reimbursement Agreement
in order to increase the aggregate Guaranties issued under the Reimbursement
Agreement from Six Million Seven Hundred Thirty Thousand Dollars ($6,730,000) to
Nine Million One Hundred Thousand Dollars ($9,100,000).

         NOW, THEREFORE, in consideration of the promises and mutual agreements
set forth herein and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties agree as follows:

1.       Amendments. The Reimbursement Agreement shall be amended as follows:

                  1.1 The reference to "Six Million Seven Hundred Thirty
Thousand Dollars ($6,730,000)" in Recital A of the Reimbursement Agreement shall
be and hereby is amended and replaced with "Nine Million One Hundred Thousand
Dollars ($9,100,000)."

                  1.2 The Schedule of Guarantors as set forth on Schedule 2 to
the Reimbursement Agreement shall be and hereby is deleted in its entirety and
replaced by Attachment A hereto.
<PAGE>
                                        2

                  1.3 Section 4(a) of the Reimbursement Agreement shall be and
hereby is amended to add the following new subsection (viii) after subsection
(vii):

         (viii) That, at the time of the sale and issuance by Obligor of its
securities (the "New Securities") for cash, other than pursuant to its stock
option or employee stock purchase plans (a "Financing"), the Obligor shall, at
the Agent's request, either:

         (1) repay outstanding loans under the Credit Agreement by one dollar
for each dollar paid in consideration for any such New Securities in a Financing
up to a maximum of the lesser of (A) the amount by which the amount of loans
outstanding under the Credit Agreement exceeds Six Million One Hundred Thousand
Dollars ($6,100,000) and (B) Three Million Dollars ($3,000,000), and if
requested by Agent, permanently reduce the outstanding commitment under the
Credit Agreement to $6,100,000; or

         (2) cause Agent's guarantee requirement under the Credit Agreement to
be reduced in an amount equal to the amount required to be repaid pursuant to
Section 4(a)(viii)(1) hereof.

                  1.4 Section 4(a) of the Reimbursement Agreement shall be and
hereby is amended to add the following new subsection (ix) after subsection
(viii):

         (ix) That, if, as of December 5, 2003, the Obligor has not sold any New
Securities in a Financing and has not drawn down Nine Million One Hundred
Thousand Dollars ($9,100,000) under the Credit Agreement, then Obligor shall, at
the Agent's request, either (A) reduce the Commitment (as defined in the Credit
Agreement) to the greater of (x) the amount of loans then outstanding under the
Credit Agreement or (y) Six Million One Hundred Thousand Dollars ($6,100,000);
or (B) cause Agent's guarantee requirement under the Credit Agreement to be
reduced by the amount by which the Commitment would be reduced pursuant to
subsection (A) of this paragraph .

                  1.5 Section 8 of the Reimbursement Agreement shall be and
hereby is amended to add the following new subsection (m) after subsection (l):

         (m) Agent shall maintain the effectiveness of its Guarantee in the
amount of at least Eight Million Dollars ($8,000,000) until at least such time
as the Obligor makes a repayment of outstanding loans or reduces its Commitment
or reduces the Agent's guarantee requirement pursuant to Section 4(a)(viii), or
reduces its Commitment or Agent's guarantee requirement pursuant to Section
4(a)(ix).

                  1.6 Section 4(a) of the Reimbursement Agreement shall be and
hereby is amended to add the following new subsection (x) after subsection (ix):

         (x) Unless the Required Guarantors provide their prior written consent,
not to make any additional borrowings under the Credit Agreement after March 5,
2003, until such time as the unrestricted cash (determined in accordance with
GAAP and excluding Excluded Cash) shown on Obligor's balance sheet is less than
$1,000,000.
<PAGE>
                                        3

         2. Amendment Limited. Except as provided herein, each of the provisions
of the Reimbursement Agreement shall remain in full force and effect following
the consummation of the transactions contemplated hereby and this Amendment No.
1 shall not constitute a modification, acceptance or waiver of any other
provision of the Reimbursement Agreement. Each of the parties hereto hereby
confirms and ratifies all of its obligations under the Reimbursement Agreement,
as amended by this Amendment No. 1. This Amendment No. 1 shall be governed and
construed in accordance with the terms of the Reimbursement Agreement.

         3. Counterparts. This Amendment No. 1 may be executed in any number of
counterparts, all of which taken together shall constitute one and the same
instrument.

         4. Definitions. Capitalized terms used and not otherwise defined in
this Amendment No. 1 shall have the respective meanings set forth in the
Reimbursement Agreement.

                   [REMAINDER OF PAGE INTENTINALLY LEFT BLANK]
<PAGE>
                                        4

         IN WITNESS WHEREOF, the parties hereto have executed this Amendment No.
1 as of the day and year first above written.

                                OBLIGOR:
                                --------

                                DSL.NET, INC.

                                By:    /s/ David F. Struwas
                                   --------------------------------------
                                Name:  David F. Struwas
                                     ------------------------------------
                                Title: Chief Executive Officer
                                      -----------------------------------

                                REQUIRED GUARANTORS
                                -------------------

                                VANTAGEPOINT VENTURE PARTNERS III (Q), L.P.

                                By:  VantagPoint Venture Associates III, L.L.C.

                                By: /s/ James D. Marver
                                   --------------------------------------
                                Name:  James D. Marver
                                     ------------------------------------
                                Title:  Managing Member
                                      -----------------------------------

<PAGE>
                                        5

COLUMBIA CAPITAL EQUITY PARTNERS II (QP), LP, AS A GUARANTOR

By:   Columbia Capital Equity Partners, L.P., its General Partner

By:     /s/ Donald A. Doering
      --------------------------------------------------
Name:   Donald A. Doering
      --------------------------------------------------
Title:  Chief Financial Officer
      --------------------------------------------------

COLUMBIA CAPITAL EQUITY PARTNERS II (CAYMAN), LP, AS A GUARANTOR

By:   Columbia Capital Equity Partners, L.P., its General Partner

By:     /s/ Donald A. Doering
      --------------------------------------------------
Name:   Donald A. Doering
      --------------------------------------------------
Title:  Chief Financial Officer
      --------------------------------------------------

COLUMBIA CAPITAL EQUITY PARTNERS II LP, AS A GUARANTOR

By:   Columbia Capital Equity Partners, L.P., its General Partner

By:     /s/ Donald A. Doering
      --------------------------------------------------
Name:   Donald A. Doering
     ---------------------------------------------------
Title:  Chief Financial Officer
        ------------------------------------------------

COLUMBIA CAPITAL INVESTORS, LLC, AS A GUARANTOR

By:    Columbia Capital, LLC, its Manager

By:     /s/ Donald A. Doering
      --------------------------------------------------
Name:   Donald A. Doering
     ---------------------------------------------------
Title:  Chief Financial Officer
        ------------------------------------------------

<PAGE>
                                        6

AGREED & ACCEPTED:

COLUMBIA CAPITAL EQUITY PARTNERS III (QP), LP, AS A GUARANTOR

By:   Columbia Capital Equity Partners III, L.P., its General Partner

By:     /s/ Donald A. Doering
      --------------------------------------------------
Name:   Donald A. Doering
      --------------------------------------------------
Title:  Chief Financial Officer
        ------------------------------------------------

COLUMBIA CAPITAL EQUITY PARTNERS III (CAYMAN), LP, AS A GUARANTOR

By:   Columbia Capital Equity Partners III, L.P., its General Partner

By:     /s/ Donald A. Doering
      --------------------------------------------------
Name:   Donald A. Doering
     ---------------------------------------------------
Title:  Chief Financial Officer
        ------------------------------------------------

COLUMBIA CAPITAL EQUITY PARTNERS III (AI), LP, AS A GUARANTOR

By:   Columbia Capital Equity Partners III, L.P., its General Partner

By:     /s/ Donald A. Doering
      --------------------------------------------------
Name:   Donald A. Doering
     ---------------------------------------------------
Title:  Chief Financial Officer
        ------------------------------------------------

COLUMBIA CAPITAL INVESTORS III, LLC, AS A GUARANTOR

By:   Columbia Capital III, LLC, its Manager

By:     /s/ Donald A. Doering
      --------------------------------------------------
Name:   Donald A. Doering
      --------------------------------------------------
Title:  Chief Financial Officer
        ------------------------------------------------
<PAGE>
                                        7

                       RATIFICATION OF SUBSIDIARY GUARANTY

        Each of the undersigned Subsidiary Guarantors hereby acknowledges and
consents to the foregoing Amendment No. 1 to the Reimbursement Agreement, dated
as of the date hereof, and agrees that the Subsidiary Guaranty, dated as of
December 27, 2002, executed by the Subsidiary Guarantors, in favor of
VantagePoint Venture Partners III (Q), L.P., as the administrative agent for the
benefit of the Guarantors party to the Reimbursement Agreement and all other
Operative Documents to which each of the Subsidiary Guarantors are a party
remain in full force and effect, and each of the Subsidiary Guarantors confirms
and ratifies all of its obligations thereunder.

                                 DSLNET COMMUNICATIONS PUERTO RICO, INC.

                                 By:          /s/ David F. Struwas
                                     ---------------------------------------
                                     Name:    David F. Struwas
                                           ---------------------------------
                                     Title:   Chief Executive Officer
                                           ---------------------------------

                                 DSLNET COMMUNICATIONS VA, INC.

                                 By:          /s/ David F. Struwas
                                     ---------------------------------------
                                     Name:    David F. Struwas
                                           ---------------------------------
                                     Title:   Chief Executive Officer
                                           ---------------------------------

                                 TYCHO NETWORKS, INC.

                                 By:          /s/ David F. Struwas
                                     ---------------------------------------
                                     Name:    David F. Struwas
                                          ----------------------------------
                                     Title:   Chief Executive Officer
                                          ----------------------------------

                                 VECTOR INTERNET SERVICES, INC.

                                 By:          /s/ David F. Struwas
                                     ---------------------------------------
                                     Name:    David F. Struwas
                                          ----------------------------------
                                     Title:   Chief Executive Officer
                                          ----------------------------------

<PAGE>
                                        8

                                   Schedule 2
                                   ----------

                                                            Maximum Principal
Guarantor                                                   Amount of Guaranty
---------                                                   ------------------

VantagePoint Venture Partners III (Q), LP                        $8,000,000.00

Columbia Capital Equity Partners II (QP), LP                        $68,757.63

Columbia Capital Equity Partners II (Cayman), LP                    $56,132.51

Columbia Capital Equity Partners II, LP                              $2,899.72

Columbia Capital Investors, LLC                                     $12,337.14

Columbia Capital Equity Partners III (QP), LP                      $518,532.22

Columbia Capital Equity Partners III, (Cayman), LP                 $284,753.65

Columbia Capital Equity Partners III, (AI), LP                      $28,645.20

Columbia Capital Investors III, LLC                                $127,941.93

                                                     TOTAL       $9,100,000.00EXHIBIT 10.29
                                                                   -------------

================================================================================
                           FIRST AMENDMENT TO GUARANTY
================================================================================

         First Amendment dated as of March 5, 2003 to Guaranty (the "First
Amendment"), by and between VANTAGEPOINT VENTURE PARTNERS III (Q), L.P., a
Delaware limited partnership (the "Guarantor") and FLEET NATIONAL BANK (the
"Lender"), amending certain provisions of the Guaranty dated as of December 27,
2002 from the Guarantor to the Lender (as amended and in effect from time to
time, the "Guaranty"). Terms not otherwise defined herein which are defined in
the Credit Agreement (as hereinafter defined) shall have the same respective
meanings herein as therein.

         WHEREAS, DSL.net, Inc. ("DSLN") and the Lender are parties to that
certain Revolving Credit and Term Loan Agreement dated as of December 13, 2002
(as amended and in effect from time to time, the "Credit Agreement") by and
between DSLN and the Lender; and

         WHEREAS, in connection with the Credit Agreement, the Guarantor
executed and delivered to the Lender the Guaranty; and

         WHEREAS, the Guarantor continues to expect to receive substantial
direct and indirect benefits from the continued extensions of credit to DSLN by
the Lender pursuant to the Credit Agreement (which benefits are hereby
acknowledged); and

         WHEREAS, the Guarantor desires to increase its liability under the
Guaranty as more fully set forth herein and the Guarantor and the Lender have
agreed, subject to the terms and conditions contained herein, to modify certain
terms and conditions of the Guaranty as specifically set forth in this First
Amendment;

         NOW, THEREFORE, in consideration of the premises and the mutual
agreements contained herein and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
hereby agree as follows:

         SS.1. AMENDMENT TO SS.4 OF THE GUARANTY. Section 4 of the Guaranty is
hereby amended by deleting the amount "$5,000,000" which appears in the first
sentence of ss.4 and substituting in place thereof the amount "$8,000,000".

         SS.2. CONDITIONS TO EFFECTIVENESS. This First Amendment shall not
become effective until the Lender receives a counterpart of this First
Amendment, executed by the Guarantor and the Lender.

         SS.3. REPRESENTATIONS AND WARRANTIES. The Guarantor hereby repeats, on
and as of the date hereof, each of the representations and warranties made by it
in the Guaranty, and such representations and warranties remain true as of the
date hereof (except to the extent of changes resulting from transactions
contemplated or permitted by the Guaranty and the other documents executed in
connection thereof) and changes occurring in the ordinary course of business
that singly or in the aggregate are not materially adverse, and to the extent
that such representations and warranties relate expressly to an earlier date),
provided, that all references therein to the Guaranty shall refer to the
<PAGE>
                                       -2-

Guaranty as amended hereby. In addition, the Guarantor hereby represents and
warrants that the execution and delivery by the Guarantor of this First
Amendment and the performance by the Guarantor of all of its respective
agreements and obligations under the Guaranty as amended hereby are within the
authority of the Guarantor and have been duly authorized by all necessary action
on the part of the Guarantor.

         SS.4. RATIFICATION, ETC. Except as expressly amended hereby, the
Guaranty and all documents, instruments and agreements related thereto are
hereby ratified and confirmed in all respects and shall continue in full force
and effect. The Guaranty and this First Amendment shall be read and construed as
a single agreement. All references in the Guaranty or any related agreement or
instrument to the Guaranty shall hereafter refer to the Guaranty as amended
hereby.

         SS.5. NO WAIVER. Nothing contained herein shall constitute a waiver of,
impair or otherwise affect any Obligations, any other obligation of the
Guarantor or any rights of the Lender consequent thereon.

         SS.6. COUNTERPARTS. This First Amendment may be executed in one or more
counterparts, each of which shall be deemed an original but which together shall
constitute one and the same instrument.

         SS.7. GOVERNING LAW. THIS FIRST AMENDMENT SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE COMMONWEALTH OF MASSACHUSETTS
(WITHOUT REFERENCE TO CONFLICT OF LAWS).
<PAGE>
                                       -3-

         IN WITNESS WHEREOF, the parties hereto have executed this First
Amendment as a document under seal as of the date first above written.

                                       VANTAGEPOINT VENTURE
                                       PARTNERS III(Q), L.P.

                                       By:  VantagePoint Venture Associates III,
                                             LLC, its General Partner

                                       By: /s/ James D. Marver
                                          ---------------------------------
                                       Title:

                                       FLEET NATIONAL BANK

                                       By: /s/ Lee A. Merkle-Raymond
                                          ---------------------------------
                                       Title:

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