≪ View Page

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
en:verejne:sit:ethernet [09.03.2024 13:28] – [Installation manuals] parity with czech Karel Kopeckýen:verejne:sit:ethernet [08.10.2024 11:28] (current) – [Security] cesnet blokuje udp 631 english Karel Kopecký
Line 23: Line 23:
  
 ===== 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                     ^
Line 54: Line 64:
 ''AB:CD:EF:12:A3:04'' or ''AB-CD-EF-12-A3-04''  ''AB:CD:EF:12:A3:04'' or ''AB-CD-EF-12-A3-04'' 
  
-{{indexmenu>:en:verejne:sit:ethernet|tsort nsort}}+{{indexmenu>:en:verejne:sit:mac|tsort nsort}}
  
-If you fail in finding your devices 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".+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".