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en:verejne:sit:ethernet [09.03.2024 13:20] – parity - one device per user Karel Kopeckýen:verejne:sit:ethernet [08.10.2024 11:28] (current) – [Security] cesnet blokuje udp 631 english Karel Kopecký
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-p{{indexmenu_n>12}}+{{indexmenu_n>12}}
  
 ====== Cable connection ====== ====== Cable connection ======
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 ===== Security ===== ===== Security =====
 +
 +<note warning>
 +Your cable-connected device has a public IPv4 address,\\
 +__**always use a properly configured firewall!**__
 +</note>
 +
 +<note important>
 +CESNET has decided to centraly block inbound connections to the UDP port 631 with regard to a serious vulnerability in CUPSd (CVE-2024-47176).
 +</note>
 +
 All devices connected with an Ethernet cable get not only an IPv6 address, but a **public IPv4 address** as well, it is therefore necessary to **correctly configure the firewall** on such devices. Alas, people do not, so, unfortunately, we had to close some ports that people commonly leave open by mistake: All devices connected with an Ethernet cable get not only an IPv6 address, but a **public IPv4 address** as well, it is therefore necessary to **correctly configure the firewall** on such devices. Alas, people do not, so, unfortunately, we had to close some ports that people commonly leave open by mistake:
 ^ Service                                    ^ Protocol  ^ Port                     ^ ^ Service                                    ^ Protocol  ^ Port                     ^
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 If you need to have one of these ports open, please visit us during the office hours or send us an email. If you need to have one of these ports open, please visit us during the office hours or send us an email.
-===== Installation manuals =====+===== How to find a MAC address ===== 
 + 
 +A MAC address is an unique identifier of a network device. It is commonly written as a hexadecimal number, which may look for instance like this: 
 + 
 +''AB:CD:EF:12:A3:04'' or ''AB-CD-EF-12-A3-04''  
 + 
 +{{indexmenu>:en:verejne:sit:mac|tsort nsort}}
  
-{{indexmenu>:en:verejne:sit:ethernet|tsort nsort}}+If you are unable to find your device's MAC address, come visit us during office and bring your device with you, we are happy to help you. Sometimes, you may find it on the device itself, or it's packaging. On devices with menus, it's commonly found in sections called "Settings" or "About the device".