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Questions tagged [protocol]

47 questions
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What are the exact protocol level differences between SSL and TLS?

This is a technical deep dive after this overview question was asked. What are the protocol differences between SSL and TLS? Is there really enough of a difference to warrant a name change? (versus calling it "SSLv4" or SSLv5 for the newer versions…
makerofthings7
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What's the point of repeating an email address in "The Envelope" and the "The Header"?

I learned that both the FROM address and the TO address is repeated in a hidden element called the "envelope", and then repeated again in the "body". Question Why isn't the envelope data copied into the "header"? Why does this duplication exist,…
TLDR
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Why is FileZilla so much faster than PSFTP?

I'm using FileZilla 3.10.3 and PSFTP 0.63 (PuTTY). Can anyone help me figure out why the throughput I get is so drastically different between the two clients? It can't just be a shortcoming of the SFTP protocol, because FileZilla (and WinSCP) is…
Chris
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What's the protocol-level difference between IPSec and "Cisco IPSec"?

Most VPN clients distinguish between IPSec and "Cisco IPSec." For example, (Apple's) iOS treats them as essentially separate things. But I can't find any explanation of what the protocol-level differences are. They may be minor, but there definitely…
Dave Peck
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11
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RFC that requires DNS servers to respond to unknown domain requests

My domain registrar and DNS provide currently ignores DNS requests to unknown domains. By ignore I mean black-holes and never responds which causes my DNS clients and resolver libraries to retry, back off, and finally timeout. dig @NS3.DNSOWL.COM…
Gray
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Which file transfer protocols support server-side copying?

I'm wondering which file transfer protocols available on Linux support server-side copying (and doesn't internally download and reupload files). The simplest use case I have is for copying large files (such as VMs) from one directory to another on…
Andrew Gunnerson
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Can nginx use different SSL protocols in different server blocks?

I'm trying to setup a hostname to demonstrate a poor SSL config and I'm having some issues. I can specify some bad cipher suites, but nginx seems to ignore the protocol selection. server { listen 443 spdy ssl; keepalive_timeout 70; …
Scott Helme
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Formal separation marker of syslog events?

I've been looking at RFC5424 to find the formally specified marker that will end a syslog event. Unfortunately I couldn't find it. So If I wanted to implement some small syslog server that reacts on certain messages what is the marker that ends a…
Martin M.
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Nginx with SPDY Draft 3, is possible?

I'm currently using Nginx 1.4.1 with SPDY module. Unfortunately, the Nginx SPDY module, work only with the Draft 2 of protocol. Is there a way to use Nginx, with SPDY Draft 3?
Eghes
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SSH without invoking shell

I've managed to mess up some shared libraries on my system, and now my shell cannot be run, thus locking me out of the system. Both ssh, sftp, and scp, as configured on the remote system, seem to rely on the shell, so those alternatives are out.…
A__A__0
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Can anyone guess what protocol these packets belong to?

We see these packets being injected in an FTP-DTP channel during a downlink file transfer on Telstra's NEXTG mobile network. We are not sure if these are network level packets, a problem with our 3G modem (HC25 based) or something like our firewall…
user27695
3
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1 answer

tcpdump - prevent interpreting/decoding protocols

Is there a way to stop tcpdump from (mis)interpreting protocols in captured packets? It assumes that traffic coming from port 4500/udp is always IPSec traffic, 53/udp is DNS query, etc and tries to decode it. That's a problem for me because I can't…
aqz
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Can I get a clear summary of the new features of pNFS?

So I'm somewhat familiar with NFS and ilk, and I realize that NFS 4 is adding a host of new features, when I stumble onto pNFS. It appears to be "parallel" NFS storage, but the diagrams and explanations that I'm getting are about as clear as…
Avery Payne
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Best/Secure Windows 2008 Server transfer protocol

I hate FTP because it is not secure, passwords are cleartext, etc. I want something safe for my windows server and I used to use sftp on linux for a while but now I turned to windows solution so I'm a bit of a newbie about it. I'd like to know,…
Tommy B.
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Listener Protocol for ELB in front of Squid Proxy

We have two Squid proxy servers for High availability. We want to use Amazon ELB in front of these Squid proxy servers. When we use Load Balancer Protocol as TCP and port 8080, Instance Protocol TCP and port 3128 -- After exporting squid proxy using…
Neetika
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