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Questions tagged [rfc]

A Request for Comments (RFC) is a publication of the Internet Engineering Task Force (IETF) and the Internet Society, the principal technical development and standards-setting bodies for the Internet.

A Request for Comments (RFC) is a publication of the Internet Engineering Task Force (IETF) and the Internet Society, the principal technical development and standards-setting bodies for the Internet.

107 questions
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Qmail / Zend Mail - RFC 5322 compliant

My company is getting spammed by itself, or rather by it's Qmail, we've got a few automated processes sending out e-mails with Qmail and Zend Mail. I'm not a expert in either of these, (I know literally nothing about them), and the 'spam e-mails'…
Epodax
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Is HTML content permitted in email header values?

In the process of troubleshooting an email message display issue, I noticed that an email header contained HTML. Example: From: To: Date: 11 Feb 13 12:00:23 Subject: Foo Test Message:
Mike B
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SMTP - Routing in RFC 821 and RFC 2821

RFC 821 indicates that the MAIL verb can be given a argument of the form "@ONE,@TWO:JOE@THREE" to indicate intermediate routing hosts (@ONE,@TWO) and the final receiver of the email (JOE@THREE). See 3.6, Relaying:…
Pete171
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Help me understand Public/Private IP space and NAT

I just started working at a small-medium sized business after graduating school. So much of my knowledge is high level concepts without a lot of hands on. My understanding that according to rfc1918 only the following IP ranges are for private…
CT.
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PTR to domain, A record for domain

Does PTR pointing to domain is forbidden? If so - which RFC states that. The same with A record pointing at the domain. As I see, usually, people are trying to avoid such configurations. But I would like to be precise here. Is it forbidden or not.…
plluksie
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DHCP renewal can't go through because DHCP server is down

To my experience, if a DHCP client tries to renew its lease, but the DHCP server is down, and after the lease time is over, there are two possible scenarios: The client keeps the IP The client goes back to INIT state I've seen the two scenarios…
AhmedWas
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syslog-ng: how to configure sending RFC5424 messages with octet-counting framing

Please don't bother reading this question. syslog-ng is already set up to send RFC5424 messages with octet-counting framing by default. I was confused by the behaviour of another component. This question is invalid. I have a syslog-ng OSE config…
davidA
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Doubts about DKIM verification (RFC6376)

Good morning, https://www.rfc-editor.org/rfc/rfc6376#section-5 reads: "Survivability of signatures after transit is not guaranteed, and signatures can fail to verify through no fault of the Signer. Therefore, a Verifier SHOULD NOT treat a message…
Tom Johnson
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Two way handshake for WHOIS protocol? RFC 3912

From RFC 3912: 3. Protocol Example If one places a request of the WHOIS server located at whois.nic.mil for information about "Smith", the packets on the wire will look like: client server at whois.nic.mil open TCP …
ImBoredAllTheTime
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IPv6 address text notation with prefix: inside or outside square brackets?

I'm skimming through some IPv6 related RFCs. Some claim that a prefix should be written outside of the square brackets, whereas others have it tacked on to the address directly. Specifically, RFC4291, section 2.3 has it like this: For example, the…
Kaz
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DHCPv6 (RFC 8415) - What are reasonable initial values for time intervals T1/T2?

As described in Section 18.2. - Client Behavior of DHCP - RFC 8415 a client uses the Solicit message to discover DHCP servers configured to assign leases or return other configuration parameters on the link to which the client is attached. As part…
goulashsoup
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Can a non-authoritative name server give any response it likes to?

Our domain registrar allows us to either make use of our own DNS servers or to use theirs (configuring DNS entries in their web interface); I suppose this is a common situation. We have opted to set up our own DNS servers. Now, the registrar's DNS…
Oliphaunt
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Is RFC1035s definition of a wrong?

[RFC1035] defines as is a domain name represented as a series of labels, and terminated by a label with zero length. This means a must be a FQDN of the form an.example. with a terminating '.'. Also,…
Sophie
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Apache set max Content-Range

The Question: Client asks for: Range:bytes=0- Server responds with: Content-Length:8396748 Content-Range:bytes 0-8396747/8396748 I want to limit that Content-Range to 1MB chunks so the server would respond like…
user1133275
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Routing RFC1918 addresses through dd-wrt via a switch

I am a bit stuck with an experiment of mine. I have a network looking somewhat like this. | Internet | | ---- |Switch| ---- | | Server w/pub IP | DD-WRT router 192.168.1.1 | …
espenfjo
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