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From Christopher Schultz <ch...@christopherschultz.net>
Subject Odd interface binding observations
Date Mon, 06 Feb 2012 18:37:22 GMT
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All,

During a recent production deployment (Debian Linux), we added a
localhost-only connector like this:

    <Connector port="8187"
               protocol="org.apache.coyote.http11.Http11NioProtocol"
               address="127.0.0.1" secure="true"
               URIEncoding="UTF-8" executor="tomcatThreadPool" />

(We use secure="true" because we have security-constraints that
require it, but we want to avoid the cost of SSL setup when
communicating locally).

/etc/hosts contains this:

127.0.0.1	localhost

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
==== end of /etc/hosts =====

When I use netstat to show me what's bound to what, I see this:

$ netstat -plan | grep 8187
tcp6       0      0 ::ffff:127.0.0.1:8187   :::*
LISTEN     2737/java

Also:

$ host localhost
localhost.chadis.com	A	[my public ip]

I'm using "localhost:8187" as my host:port in my connection URL and
everything seems to work. Do I just not know how to read netstat's
output (I don't know much about the way Linux does IPv6)?

Anyone have any idea why 'host' returns my public IP for 'localhost'?
Or, when I use "localhost:8187" (which probably resolves to my public
IP), I can establish a connection?

Thanks,
- -chris
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