Freebsd change default Internet channel route
If you use route change command, you need to restart network service to apply the changes, e.g.: $ sudo /etc/rc.d/netif restart
internet
What to filter when providing very limited open WiFi to a small conference or meeting?
For starters, be very specific about the type of traffic you want to allow. Have a default deny rule then allow ports like 80, 443, 993, 587, 143, 110, 995, 465, 25 (I personally would rather not open this, but you probably will get a ton of complaints if you don’t). Also permit UDP connections … Read more
Internet cafe software for linux [closed]
Maybe you will be interested to have a look at this open source project Mkahawa, a derivative of Cafe Con Leche (old unmaintained). It is a full Internet Cafe billing system, but of course you are always free to charge nothing for usage.
What’s the best way to monitor Internet traffic for the entire office?
I would recommend against using wireshark to monitor traffic. You’ll just get too much data, but you have a hard time analyzing the data. If you need to look at/troubleshoot the interaction between a couple machines, wireshark is great. As a monitoring tool, IMHO, wireshark is not quite the tool you need. Profile the network … Read more
Mounting a file system over the internet
No one has mentioned sshfs yet. If you’re on a modern linux distro and have ssh access to the remote host, it’s as simple as: sshfs user@hostname:/remote/directory /local/directory Performance is quite acceptable (but not nearly as fast as a streamed sync like rsync if you require the whole directory).
How do I acquire a domain owned by someone else?
If you do file a domain name registration dispute with ICANN, be absolutely certain your claim is ironclad. Also keep in mind that this will (last I looked) cost you around $1500, which is often way more than the person who owns the domain would ask to sell it to you. If you do intend … Read more
How can I find out which server OS a particular site is running?
You can look for OS fingerprinting functionality built into NMap. However, if you’re looking for something like “What is Google running?” you won’t get far since you won’t know what’s behind their load balancers, or firewalls will block it, and fingerprinting can only be so accurate so you can get false reports back and you … Read more
How to securely join two networks together over the Internet?
can VPN be implemented on the routers only? Can the computers on the network be configuration free? Yes. Assuming reasonable routers and a reasonable network layout. If your sites are all sharing the same IP range (i.e. they are all using 192.168.0.0/24 and therefore overlapping) then you’ll have to do full NAT and things get … Read more
What exactly is the MTU/MRU issue, what it is caused by and how to fix it?
This is a bit of a complicated Question, so I’ll start with the basics. Forgive me if you know all this already. MTU is the Maximum Transmission Unit, the largest packet of data that a computer interface will send. For Ethernet the default is 1500 Bytes. Ethernet frames typically are allowed to be up to … Read more
How are cellphone IP addresses assigned?
To answer your first question mobile/cell-phone IP addresses are handed out using DHCP like any other client device. To answer your second questions, well yes, through NAT – that’s what NAT does, it allows multiple ‘inside’ devices to get IP services through a NAT gateway – external IP services will not be able to identify … Read more