modeemi:pub:computer-networking-event-22052026
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| modeemi:pub:computer-networking-event-22052026 [2026/05/24 09:33] – [1. How does the LAN works (single subnet)] niko | modeemi:pub:computer-networking-event-22052026 [2026/05/24 09:50] (current) – [1. How does the LAN works (single subnet)] niko | ||
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| - command "arp -n" in linux (net-tools have to be installed) | - command "arp -n" in linux (net-tools have to be installed) | ||
| - | | {{: | + | | {{: |
| | Local area network (4 participants) | | | Local area network (4 participants) | | ||
| - | ==== 1. How does the networks function? ==== | ||
| - | The following points will be discussed: | ||
| - | - IP addresses (IPv4) | ||
| - | - Gateway | ||
| - | - Broadcast | ||
| - | - Network | ||
| - | - Local network | ||
| - | - Set it up (static) | ||
| - | - Connect computers together | ||
| - | - Take a look at packets (wireshark) | ||
| - | - ipinfo.io | ||
| - | - jodies.de/ | ||
| | | ||
| - | ==== 2. Set up the router with custom configuration | + | ==== 2. Connect |
| + | |||
| + | Each group (2-3 people) has it's own router (with OpenWRT). | ||
| + | One person should set up the router, together with rest of group, from one computer over the web interface (accessible over 192.168.1.1 - and later over 10.1.x.1 address from browser). | ||
| Set up following stuff: | Set up following stuff: | ||
| - | - Set up network IP addresses (IPv4) | + | - Set different |
| - First router - 10.1.1.0/24 | - First router - 10.1.1.0/24 | ||
| - Second router - 10.1.2.0/24 | - Second router - 10.1.2.0/24 | ||
| - Third router - 10.1.3.0/24 | - Third router - 10.1.3.0/24 | ||
| - | | + | - Fourth router - 10.1.4.0/ |
| - | - https://adguard-dns.io/en/public-dns.html | + | - Reconnect to the router (so that Your computer gets NEW ip from router) |
| - | - check if ADs work? | + | - Connect WAN port of all routers to common switch |
| - | | + | |
| - | ==== 3. Set up point to point VPN ==== | + | - First router - 10.1.5.1/24 |
| + | | ||
| + | - Third router - 10.1.5.3/24 | ||
| + | | ||
| + | - Set up firewalls | ||
| + | - Forwarding between LAN and WAN has to be always allowed | ||
| + | - Disable the masquerade | ||
| + | |||
| + | Now time to verify: | ||
| + | - Ping people in the same subnet (behind the same router) | ||
| + | - Ping people in the other subnet (behind the other router) | ||
| + | - Traceroute the people in the other subnet, and take a look what are the routers the packet goes through | ||
| + | - Take a look with wireshark at all the packets | ||
| + | |||
| + | |||
| + | | {{: | ||
| + | | Interconnected LAN networks | | ||
| + | |||
| + | ==== 3. Set up point to point VPN (for next event) | ||
| - Install wireguard in openwrt | - Install wireguard in openwrt | ||
| - Then set it up with helpful instructions from this page | - Then set it up with helpful instructions from this page | ||
| - | ==== 4. Turn Chromebook into cursed router ==== | + | ==== 4. Turn Chromebook into cursed router |
| - we will find commands on the fly | - we will find commands on the fly | ||
modeemi/pub/computer-networking-event-22052026.1779615196.txt.gz · Last modified: by niko