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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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Is it legal for a DHCP relay agent to relay RENEWAL requests that were directly unicast to the "Server identifier" server?

I'm observing the following in a packet capture. Client -> Broadcast : DHCP Request Relay -> Client : DHCP Ack (Option 54 == Server) ... After T1 expires ... Client -> Server Identifier : DHCP Request Relay -> Client : DHCP…
user80551
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RFC 3074 DHCP Load Balancing STID vs RFC 2131 DHCP xid

Section 2.2 of RFC 3074 defines a Service Transaction ID (STID) as: An attribute of the individual client requests used for load-balancing. However, section 2 of RFC 2131 defines the xid field of a DHCP packet as: Transaction ID, a random number…
vpseg
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Where to find symbol definitions for RFC protocol flow diagram?

I am reading RFC5077, and bumped into following diagram: ClientHello (empty SessionTicket extension)--------> ServerHello (empty…
Nan Xiao
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RFC 5321 requires my SMTP server with the Enhanced-Status-Codes service extension to reply with “250 OK”

RFC 2034 4. The Enhanced-Status-Codes service extension Servers supporting the Enhanced-Status-Codes extension must preface the text part of almost all response lines with a status code. As in RFC 1893, the syntax of these status codes is…
Константин Ван
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rfc3207 smtp starttls restriction confusion

From https://www.rfc-editor.org/rfc/rfc3207: A publicly-referenced SMTP server MUST NOT require use of the STARTTLS extension in order to deliver mail locally. This rule (1.) prevents the STARTTLS extension from damaging the interoperability…
Rick
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Is it possible DNS packet contains more than one SOA resource record

I've read RFC 1034 and RFC 1035 to learn about DNS protocol standards. I'm searching to find a limit occurring of SOA resource records. I'm aware that A, AAAA, CNAME, NS, MX, TXT RRs have no limit. How about SOA?
Hoseyn Heydari
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Is there any difference between prisoner.iana.org, blackhole-1.iana.org, and blackhole-2.iana.org?

Probably not the most useful question, but I'm curious: I understand (in theory) that if a reverse lookup for a private IP makes it makes it past your own DNS servers you should get back "prisoner.iana.org" "blackhole-1.iana.org" or…
username
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Special characters in mail (address) headers and RFC2047 encoding

I have some unexpected handling of RFC2047 "From" headers on Exim. (Actual addresses have been changed, the original display name contained non-ASCII characters) For this "From" header: From: =?iso-8859-1?Q?Doe=2C_John?= Which…
Gert van den Berg
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Yahoo Mail: "No mx record found for domain"

Yahoo's Mail servers are refusing to deliver messages to the mail server for a domain I manage. It complains that there is no MX record for the domain. According to my understanding for many years, and according to RFC 5321, if there is no MX…
Oliver Crow
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Email format RFCs

I know there are lots of RFCs that changed how an email can be made. However, most of the RFCs don't apply to for example outlook. First of all, what are RFCs exactly? And why don't for example outlook has all RFCs applied? For example, if I try to…
Joshua Bakker
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To-Recipient Required in Email?

I would like to know if a "To"-Recipient is required in an e-mail per definition or if all recipients could be Bcc or Cc. RFC5322 states The only required header fields are the origination date field and the originator address field(s). All…
LeRookie
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IMAP woes when moving to new Exchange

We've recently moved to a semi-outsourced Exchange farm, replacing our internal one. An application I've been asked to help troubleshoot uses IMAP to download some emails from the Exchange servers in question. This fails. Attempting to "speak the…
Keith Douglas
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Can I ping 127.0.0.1 if my computer isn't connected to a network?

Does pinging 127.0.0.1 work on your machine if it's not on the network? Can these two machine be on the same network? machine A (192.168.173.11) machine B (192.168.163.11)
carolyne mumo muia
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RFC5321 "receiver should check [...] reply code" (why?)

In SMTP commands are sent by the sender and responses which all begin with a numeric code are sent by the receiver. but then there's this bit: RFC5321 sec4.2 Whenever possible, a receiver- SMTP SHOULD test the first digit (severity indication) of…
user313114
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Different throughput Ethernet-Wireless Wireless-Ethernet

I've built an open source implementation of RFC2544 to test IPv4 network devices. One of the first devices I tested is a wireless router D-Link 2640B. In order to measure its performance I use a laptop with a 10/100 Mb Ethernet interface and an…
condorwasabi
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