Ryan Durfey created TC-388:
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Summary: Max IP Address in DNS Answer Behavior Change
Key: TC-388
URL: https://issues.apache.org/jira/browse/TC-388
Project: Traffic Control
Issue Type: Improvement
Components: Traffic Ops, Traffic Router
Affects Versions: 2.1.0
Reporter: Ryan Durfey
The current default configuration for "Maximum IP addresses in DNS answer" is
zero which causes the Traffic Router to return all IP addresses in a cache
group to the DNS system for a client. As cache groups grow beyond ~20 caches
the responses get too long for some networks and clients to handle. We have
seen specific instances where this breaks on the Verizon network.
I suggest we make the default some lower but reasonable number that works in
most cases like "3". This is a better default that would work for most small
to mid size services. Savvy users who know to change this would be unaffected.
But this could save lots of errors for inexperienced users.
I would also suggest that we consider an upper bound limitation like "10" for
at least a warning to users trying to configure a hire number. If you have to
assign more than this then we should consider decoupling the number of IPs
returned from the number of servers that content is hashed across.
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