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The mysterious, legendary giant squid's genome is revealed -- ScienceDaily
Albertin also identified more than 100 genes in the protocadherin family -- typically not found in abundance in invertebrates -- in the giant squid genome.

"Protocadherins are thought to be important in wiring up a complicated brain correctly," she says. "They were thought they were a vertebrate innovation, so we were really surprised when we found more than 100 of them in the octopus genome (in 2015). That seemed like a smoking gun to how you make a complicated brain. And we have found a similar expansion of protocadherins in the giant squid, as well."
squid  architeuthis  cephalopod 
5 weeks ago by asl2
Features/CacheHierarchy - Squid Web Proxy Wiki
Feature: Linking Squid into a Cache Hierarchy

* Goal: To connect multiple Squid together forming a 'mesh' or hierarchy of caches.
* Status: completed.
* Version: 1.2
squid  documentation  spec  proxy  example  wikientry 
6 weeks ago by ezequiel
SquidFaq/SquidMemory - Squid Web Proxy Wiki
Squid uses a lot of memory for performance reasons. It takes much, much longer to read something from disk than it does to read directly from memory.

A small amount of metadata for each cached object is kept in memory. This is the StoreEntry data structure. This is 56-bytes on 32-bit architectures and 88-bytes on 64-bit architectures. In addition, there is a 16-byte cache key (MD5 checksum) associated with each StoreEntry. This means there are 72 or 104 bytes of metadata in memory for every object in your cache. A cache with 1,000,000 objects therefore requires 72MB of memory for metadata only. In practice it requires much more than that.

Uses of memory by Squid include: [...]
squid  memory  configuration  tips  example  wikientry  documentation  faq  proxy  performance 
6 weeks ago by ezequiel
SquidFaq/ConfiguringSquid - Squid Web Proxy Wiki
Before you start configuring:
The best all around advice I can give on Squid is to start simple! Once everything works the way you expect, then start tweaking your way into complexity with a means to track the (in)effectiveness of each change you make (and a known good configuration that you can always go back to when you inevitably fubar the thing!).
squid  faq  reference  documentation  configuration  sysadmin  networking  proxy  example  tips  wikientry  security  links  releaserelated  oldversion 
6 weeks ago by ezequiel
SquidFaq/SquidAcl - Squid Web Proxy Wiki
Squid's access control scheme is relatively comprehensive and difficult for some people to understand. There are two different components: ACL elements, and access lists. An access list consists of an allow or deny action followed by a number of ACL elements.

When loading the configuration file Squid processes all the acl lines (directives) into memory as tests which can be performed against any request transaction. Types of tests are outlined in the next section ACL Elements. By themselves these tests do nothing. For example; the word "Sunday" matches a day of the week, but does not indicate which day of the week you are reading this.

To process a transaction another type of line is used. As each processing action needs to take place a check in run to test what action or limitations are to occur for the transaction. The types of checks are outlined in the next section Access Lists followed by details of how the checks operate.
squid  faq  reference  documentation  configuration  sysadmin  networking  proxy  example  tips  wikientry  security 
6 weeks ago by ezequiel
Squid - Users - Possible Bug? "parameters()" syntax in acl dstdomain results in rule not working?
A: [...]
> I finally realized there appeared to be something wrong with the
> "parameters" handling of the external file, and turned it into:
> acl WHITELIST dstdomain "/etc/squid/whitelist.txt"
> With that one change it worked properly.
> Is this a known bug?

IIRC, to use parameters(), you need to turn
configuration_includes_quoted_values on: [...]
emailmessage  2018  squid  issue  fileformats  configuration  workaround  tips  networking  sysadmin  proxy 
6 weeks ago by ezequiel
Re: [squid-users] ipcCreate: fork: (12) Cannot allocate memory from Amos Jeffries on 2011-03-21 (squid-users)
>>> Squid has started to NOT come back up after log rotate. Here is
>>> snippett from cache.log.
>>> Machine has 1G ram and cache_mem is set to 500MB,
>> Squid uses fork() instead of vfork() to spawn helpers, on some OS the
>> fork() implementation prevents extremely huge amounts of virtual
>> memory being "allocated" (even though it is neither allocated nor used).
> I think you mean that on some OS the form implementation 'results in'
> rather than 'prevents'
> on linux this is the 'overcommit' option, on by default in the kernel,
> but many people think it makes their systems more reliable to disable it.
2011  squid  memory  issue  mailinglistpost  kernel  docker  sysadmin  configuration  linux  proxy 
9 weeks ago by ezequiel
ufdbGuard is a URL filter for the Squid web proxy | URLfilterDB
ufdbGuard supports configuration of groups with different web access policies, SafeSearch enforcement, SSH tunnel detection, safer HTTPS traffic, time-based access rules and much more.  The URL filter blocks Tor, UltraSurf, SSH tunnels, VPN tunnels and remote access software used to connect to a PC at home whilst at work.  ufdbGuard works with the Squid web proxy which is also Free Open Source Software.
squid  proxy  security 
november 2019 by some_hren
Features/SslPeekAndSplice - Squid Web Proxy Wiki

Applicable processing steps



step1, step2

When a peek rule matches during step1, Squid proceeds to step2 where it parses the TLS Client Hello and extracts SNI (if any). When a peek rule matches during step 2, Squid proceeds to step3 where it parses the TLS Server Hello and extracts server certificate while preserving the possibility of splicing the client and server connections; peeking at the server certificate usually precludes future bumping (see Limita...
november 2019 by lkoniecki
We hypothesize that the shonisaurs were killed and carried to the site by an enormous Triassic cephalopod, a “kraken,” with estimated length of approximately 30 m, twice that of the modern Colossal Squid Mesonychoteuthis. In this scenario, shonisaurs were ambushed by a Triassic kraken, drowned, and dumped on a midden like that of a modern octopus. Where vertebrae in the assemblage are disarticulated, disks are arranged in curious linear patterns with almost geometric regularity. Close fitting due to spinal ligament contraction is disproved by the juxtaposition of different-sized vertebrae from different parts of the vertebral column. The proposed Triassic kraken, which could have been the most intelligent invertebrate ever, arranged the vertebral discs in biserial patterns, with individual pieces nesting in a fitted fashion as if they were part of a puzzle
november 2019 by yorksranter

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