Merge pull request #44 from SystemsApproach/linkfix

fix broken links and ignore 403 errors

Author: drbruced12

access.rst

@@ -676,7 +676,7 @@ the mechanism for doing this is more detail.
 .. admonition:: Further Reading
 
    R. MacDavid, *et al.* `A P4-based 5G User Plane Function
-   <https://www.cs.princeton.edu/~macdavid/media/up4-sosr21.pdf>`__.
+   <https://dl.acm.org/doi/10.1145/3482898.3483358>`__.
    ACM SOSR. September 2021.
 
 The main takeaway from this discussion is that access networks and

conf.py

@@ -102,7 +102,7 @@ def get_version():
 
 # Ignore link check for the following websites
 linkcheck_ignore = [
-     'https://amzn.to/', 'https://amazon.com'
+     'https://amzn.to/', 'https://amazon.com', 'https://dl.acm.org', 'https://developers.redhat.com', 'https://www.adlittle.com'
 ]
 
 # -- Options for HTML output -------------------------------------------------

intro.rst

@@ -39,7 +39,7 @@ well-documented in an article by Feamster, Rexford, and Zegura.
 .. admonition:: Further Reading
 
    N. Feamster, J. Rexford, and E. Zegura. `The Road to SDN: An Intellectual History of Programmable Networks
-   <https://www.sigcomm.org/sites/default/files/ccr/papers/2014/April/0000000-0000012.pdf>`__.
+   <https://dl.acm.org/doi/10.1145/2602204.2602219>`__.
    SIGCOMM CCR, April 2014.
 
 We add two footnotes to that history. The first is a 2001 National

uses.rst

@@ -478,7 +478,7 @@ A.D. Little.
 
    `Who Dares Wins! How Access Transformation Can Fast-Track Evolution
    of Operator Production Platforms
-   <https://www.adlittle.com/en/who-dares-wins>`__. *A.D. Little
+   <https://www.adlittle.com/en/insights/report/who-dares-wins>`__. *A.D. Little
    Report*, September 2019.
 
 The central challenge of initiatives like CORD is to disaggregate the
@@ -598,7 +598,7 @@ to determine which flows shared buffer capacity at each switch.
 .. admonition:: Further Reading
 
    X. Chen, et. al. `Fine-grained queue measurement in the data plane
-   <https://p4.org/p4/conquest>`__. ACM CoNEXT'19, December 2019.
+   <https://dl.acm.org/doi/10.1145/3359989.3365408>`__. ACM CoNEXT'19, December 2019.
 
 Similarly, packets can report the decision making process that
 directed their delivery, for example, with something like: *"In Switch