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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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Does the OS X DHCP client support classless static routes (RFC3442)?

Simply put: does Mac OS X support RFC3442? RFC3442 implements DHCP codes (121 and 249) to provide classless static routes to DHCP clients. I can only seem to find rather old information circa 2005-2008 which implies that OS X does not support…
rthomson
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Which ICMP types (v4/v6) should not be blocked?

I have made a lot of research into this and have found that some references contradict each other. IPV6 For example RFC4890 says the following types should be allowed for optimal functionality: Type 1, 2, 3, 4, 128, 129 and for mobility assistance…
Houman
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TLS Implementation/RFC interpretation

Does the Server Hello break the RFC? There seems to be contradiction in RFC. A customer claims our device (Citrix Netscaler) returns Extension (ec_point_formats: EC point format: uncompressed) when they do not request it. Because of this they…
Leo
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Which characters/values are allowed to use in DNS?

While I was looking on RFCs of DNS because of implementation to check underscore in CNAME records, I found this interesting discussion and RFC with interesting point: https://www.ietf.org/mail-archive/web/dnsop/current/msg01449.html RFC 2181 11.…
Matej Ridzon
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Does a ping to 127.0.0.1 hit the network card? Which RFC / standard states that?

I recently did an exam where one of the questions stated that you can run ping 127.0.0.1 on a computer to verify if its network card is working. I have already read on multiple sources that this actually only guarantees that the networking software…
Schrute
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Stateful IPv6 configuration when router is absent on link

RFC 2462 specifies: 5.5.2. Absence of Router Advertisements If a link has no routers, a host MUST attempt to use stateful autoconfiguration to obtain addresses and other configuration information. An implementation MAY provide a way to disable…
user81458
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Is there a set of RFC's that every admin should know about?

Reading through the RFC's can result in finding very interesing and important topics that any sysadmin would deem useful. I also sometimes find it to be a good cure for insomnia reading through it, and some RFC's are just down right bogus (RFC…
Chad Harrison
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Why not shorten a single :0000: field in IPv6

rfc5952, section 4.2.2 "Handling One 16-Bit 0 Field" goes: The symbol "::" must not be used to shorten just one 16-bit 0 field. For example, the representation 2001:db8:0:1:1:1:1:1 is correct, but 2001:db8::1:1:1:1:1 is not correct. The…
Melissa Boiko
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How can DHCPv6 server allocate fixed IPv6 addresses to clients if it's not allowed to interpret DUID?

According to RFC3315: Each DHCP client and server has a DUID. DHCP servers use DUIDs to identify clients for the selection of configuration parameters and in the association of IAs with clients. DHCP clients use DUIDs to identify a server in…
SF.express
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How is truncation performed in DNS according to RFC 1035?

I'm trying to implement my own DNS server from scratch. However, I'm having difficulty understanding how RFC 1035 recommends truncation to be performed. Section 6.2 says: When a response is so long that truncation is required, the truncation should…
Chris Smith
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Message-ID of delivery report is equal to original mail

I discoverd that the delivery status report has the same message-id as the original mail. Here is the text of the delivery report: Incoming DSN message: From: Mail Delivery Subsystem To: info@foo.de Subject: DELAY: …
guettli
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How to block this range of RFC1918 on Ubuntu server?

We're running an IKEv2 VPN on a Ubuntu server. One of our users has run a NetScan while using our VPN, which has upset the server provider. This is what the server provider has recommended: We would recommend that you set up a local firewall and…
Houman
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LDAPS Microsoft Active Directory Multiple Certificates RFC6125

We have an Microsoft Active Directory Domain with a large pool of domain controllers (DC) that are are setup with LDAP. These are all setup with LDAPS and uses Certificate Services via a template to setup a certificate with the domain name (i.e.…
thxmike
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Rejected emails: Messages with multiple addresses in From: header are not accepted - gsmtp

We host a service which can send emails on behalf of client businesses to end users. These emails must appear to be from the client business, even though they are generated from within our system. We had previously been using multiple addresses in…
Russell Johnson-Bade
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why can the Sender field not be easily configured?

To clarify this and this explanation for Sender:: In brief, From: in the message indicates the mailbox of whoever wrote the message, Sender: indicates the entity which sent a message on behalf of someone else, and To: and Cc: indicate the…
Thufir
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