Path: csiph.com!newsfeed.hal-mli.net!feeder3.hal-mli.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.fsmpi.rwth-aachen.de!news-1.dfn.de!news.dfn.de!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: Mike Easter Newsgroups: comp.os.linux.networking,alt.comp.freeware,alt.internet.wireless Subject: Re: Frustrated that I don't UNDERSTAND why my network times out Date: Wed, 09 Oct 2013 11:28:22 -0700 Lines: 32 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: individual.net mpr689HCnw/ZiYPz7NlOyQieoBptLOWVacmYo3WPBlonvmczTY Cancel-Lock: sha1:eAzf4wkz69ss26nhD59ubtiZSGQ= User-Agent: Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101 Thunderbird/24.0 In-Reply-To: Xref: csiph.com comp.os.linux.networking:2426 billy wrote: > Tauno Voipio wrote: > >> TCP should be able to find a suitable segment size, but it needs >> an ICMP message for the functionality. There are sysadmins killing >> all ICMP, in an attempt to hide from ICMP echo (ping). This could >> be the cause here. > > What I don't understand is whether the web browser, which is the > problem observed, is using ICMP or TCP. > > Q: What is the web browser using? (ICMP? TCP?) TCP. But the 'process' involves TCP/IP. It would be of value for you to learn about the protocols. http://en.wikipedia.org/wiki/Internet_protocol_suite The article breaks down the different layers of the suite. But your 'breakdown' is more than just the browser, so you should also understand the protocols used by your tools of investigation. Standard ping = ICMP (also there is UDP pinger) traceroute and tracert also can come in 'flavors' ICMP, UDP, and TCP Some hop obstructions or 'holes' are related to protocol. -- Mike Easter