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Mar
6
revised Tunneling in IPv6:
Try to clarify the tunneling process.
Mar
6
comment Tunneling in IPv6:
@JoesyXHN: IPv4 header will be from R1 to R2 (source and destination) both addresses appear in the header. I have updated my response accordingly.
Mar
6
revised Tunneling in IPv6:
Clarify headers
Mar
6
comment Tunneling in IPv6:
@JoesyXHN: Revised the first paragraph to answer your question. Left the rest of the answer as most of it is background. It may be of interest to people who are trying to mix stacks.
Mar
6
revised Tunneling in IPv6:
Answer revised questions.
Mar
6
answered Tunneling in IPv6:
Mar
6
answered Weird MySQL query plan: why is this query using temporary & filesort? How to optimize it?
Mar
5
awarded  Enthusiast
Mar
5
comment Email delivery management grievances
There are standards and best practices. If you follow them you run little risk of having your email classified as Spam. Most Spam clearly violates standards and best practices. Unfortunately, there are standards I can not enforce because too many legitimate senders violate them.
Mar
5
answered Plugging Monitor into Local Debian Headless Server
Mar
5
answered Is it possible to use same SSL certificate for Apache and OpenVPN?
Mar
4
comment Custom headers in Email lost?
Also duplicate headers can be added. This is relatively common if email passes through the same anti-spam software on multiple servers, or if the original messages had forged anti-spam headers. By convention custom headers always begin X- ad this prevents name collisions with standard headers.
Mar
4
revised Is it safe to assume that python interpreter is installed on Debian/Ubuntu server?
added 76 characters in body
Mar
3
answered How to log commands/logins in linux?
Mar
3
revised Multiple PTR records
Add comments on multi-homed servers.
Mar
3
comment Multiple PTR records
@hobodave: Thanks for helping me clarify my answer.
Mar
3
comment Bind apparently receives responses from queries but then does nothing with them
@Zipp. Bind will use IPv6 first if any of the interfaces it binds to have IPv6 enabled. You may want to test a zone like localhost that should be served locally to see that you are logging the query and response. Also check /etc/resolv.conf to ensure you are using 127.0.0.1 first.
Mar
3
comment Multiple PTR records
@hobodave: My answers for general DNS would be somewhat different, and I tried to incorporate that in my answer. The topic is SMTP, and my answer reflects best practices, experience, and research.
Mar
3
comment Multiple PTR records
@hobodave: I had not intention of spreading FUD, and don't belive I did so. I believe my recommendations are will supported by the RFCS and other best practices. I have been dealing with email problems for years. For most of the past year, I have captured details on every incoming SMTP request to a database for analysis. May answers are based on that experience and analysis. Do you have conflicting evidence?
Mar
3
revised Multiple PTR records
Add additional background for hobo dave.