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#phy

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Kevin Karhan :verified:<p><span class="h-card" translate="no"><a href="https://fedi.sillykittens.net/@k4m1" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@<span>k4m1</span></a></span> <span class="h-card" translate="no"><a href="https://mastodon.social/@stman" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@<span>stman</span></a></span> yeah, according to <a href="http://realtek.info/pdf/rtl8139cp.pdf" rel="nofollow noopener noreferrer" target="_blank">the</a> <a href="https://infosec.space/tags/RTL8139" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>RTL8139</span></a> <a href="https://infosec.space/tags/datasheet" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>datasheet</span></a> this is basically a very cheap 10/100M NIC designed <a href="https://infosec.space/tags/embedded" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>embedded</span></a> systems and low-end/low-cost desktops, and for a device designed and sold in 2006 it made sense, given back then <a href="https://infosec.space/tags/Gigabit" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Gigabit</span></a>-<a href="https://infosec.space/tags/Ethernet" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Ethernet</span></a> and Cat.5 cabling was considered high-end.</p><ul><li>And unlike contemporary / successor chips by <a href="https://infosec.space/tags/Intel" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Intel</span></a> like the famous <a href="https://infosec.space/tags/i210" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>i210</span></a> (which is still offered as <a href="https://infosec.space/tags/i219" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>i219</span></a> but mostly succeeded by the <a href="https://infosec.space/tags/i225" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>i225</span></a> as a 2,5GBase-T version) is way cheaper, which pre-<a href="https://infosec.space/tags/RoHS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>RoHS</span></a> - NICs being sold for like € 10 <em>retail &amp; brand-new</em>....</li></ul><p>The <a href="https://wiki.osdev.org/RTL8139" rel="nofollow noopener noreferrer" target="_blank">few issues known</a> only affect like <a href="https://infosec.space/tags/Virtualization" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Virtualization</span></a> setups, a market this thing was never designed for (most likely also never tested against).</p><ul><li>I'd not he surprised if a lot of cheap <a href="https://infosec.space/tags/ThinClients" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ThinClients</span></a> and other systems used these NICs because of the simplicity of integration, being a cheap 3,3V single-chip (+auxilliary electronics) solution and propably costling less than 10¢ on a reel of 10.000.</li></ul><p>It's the reason why to this day we see <a href="https://infosec.space/tags/Realtek" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Realtek</span></a> NICs being shipped instead of fanning-out &amp; enabling <a href="https://infosec.space/tags/SoC" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SoC</span></a>-integrated NICs with a <a href="https://infosec.space/tags/MAC" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>MAC</span></a> &amp; <a href="https://infosec.space/tags/PHY" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>PHY</span></a> instead: Because the auxilliary parts for those are more expensive than just getting a PCI(e lane) somewhere and plonking it down.</p><ul><li>Maybe there have even been some really cheap, low-end <a href="https://infosec.space/tags/Routers" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Routers</span></a> / <a href="https://infosec.space/tags/Firewalls" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Firewalls</span></a> aiming at <a href="https://infosec.space/tags/SoHo" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SoHo</span></a> customers back in those days, cuz back then 16MBit/s <a href="https://infosec.space/tags/ADSL2" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ADSL2</span></a> was considered fast, and Realtek's NICs up until recently only delivered like 60-75% of the max. speed advertised, so by the time someone would notice, that gearvwould've been EoL'd anyway and those who did notice right-away never were the target audience to begin with.</li></ul><p>Most modern NICs are more complex and demand more configuration / driver support...</p>
IT News<p>Ethernet For Hackers: Transformers, MACs And PHYs - We’ve talked about Ethernet basics, and we’ve talked about equipment you will find... - <a href="https://hackaday.com/2024/03/07/ethernet-for-hackers-transformers-macs-and-phys/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">hackaday.com/2024/03/07/ethern</span><span class="invisible">et-for-hackers-transformers-macs-and-phys/</span></a> <a href="https://schleuss.online/tags/poweroverethernet" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>poweroverethernet</span></a> <a href="https://schleuss.online/tags/hackadaycolumns" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>hackadaycolumns</span></a> <a href="https://schleuss.online/tags/networkhacks" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>networkhacks</span></a> <a href="https://schleuss.online/tags/ethernetphy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ethernetphy</span></a> <a href="https://schleuss.online/tags/ethernet" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ethernet</span></a> <a href="https://schleuss.online/tags/8p8c" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>8p8c</span></a> <a href="https://schleuss.online/tags/phy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>phy</span></a> <a href="https://schleuss.online/tags/poe" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>poe</span></a></p>
IT News<p>Ethernet For Hackers: Equipment Exploration - Last time, we talked about the surface-level details of Ethernet. They are fundame... - <a href="https://hackaday.com/2024/02/28/ethernet-for-hackers-equipment-exploration/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">hackaday.com/2024/02/28/ethern</span><span class="invisible">et-for-hackers-equipment-exploration/</span></a> <a href="https://schleuss.online/tags/poweroverethernet" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>poweroverethernet</span></a> <a href="https://schleuss.online/tags/hackadaycolumns" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>hackadaycolumns</span></a> <a href="https://schleuss.online/tags/ethernetswitch" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ethernetswitch</span></a> <a href="https://schleuss.online/tags/networkhacks" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>networkhacks</span></a> <a href="https://schleuss.online/tags/ethernet" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ethernet</span></a> <a href="https://schleuss.online/tags/routers" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>routers</span></a> <a href="https://schleuss.online/tags/how" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>how</span></a>-to <a href="https://schleuss.online/tags/router" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>router</span></a> <a href="https://schleuss.online/tags/rj" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>rj</span></a>-45 <a href="https://schleuss.online/tags/8p8c" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>8p8c</span></a> <a href="https://schleuss.online/tags/rj45" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>rj45</span></a> <a href="https://schleuss.online/tags/phy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>phy</span></a> <a href="https://schleuss.online/tags/poe" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>poe</span></a></p>
IT News<p>Ethernet For Hackers: The Very Basics - Ethernet is ubiquitous, fast, and simple. You only need two diffpairs (four wires)... - <a href="https://hackaday.com/2024/02/12/ethernet-for-hackers-the-very-basics/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">hackaday.com/2024/02/12/ethern</span><span class="invisible">et-for-hackers-the-very-basics/</span></a> <a href="https://schleuss.online/tags/hackadaycolumns" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>hackadaycolumns</span></a> <a href="https://schleuss.online/tags/networkhacks" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>networkhacks</span></a> <a href="https://schleuss.online/tags/ethernet" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ethernet</span></a> <a href="https://schleuss.online/tags/how" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>how</span></a>-to <a href="https://schleuss.online/tags/rj" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>rj</span></a>-45 <a href="https://schleuss.online/tags/8p8c" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>8p8c</span></a> <a href="https://schleuss.online/tags/rj45" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>rj45</span></a> <a href="https://schleuss.online/tags/phy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>phy</span></a></p>
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