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
I do the exact same thing on my dev server(s) so that I can have an rsynced mirror locally and on the off-site server with identical configs. Here’s what you need in your dnsmasq.conf (make sure you restart it) assuming your webserver’s internal interface is 192.168.0.3: address=/.server.mydomain.com/192.168.0.3 This will create a wildcard entry for *.server.mydomain.com … Read more
With the assistance of a few friends helping me research this, I was FINALLY able to get it working. Had to run this script in order to properly forward TCP/IP traffic: #!/bin/sh PATH=/usr/sbin:/sbin:/bin:/usr/bin # Primary Connection – 2085426230 IF1=eth0 IP1=172.16.0.2 P1=172.16.0.1 P1_NET=172.16.0.0 # Secondary Connection – 2085420213 IF2=eth1 IP2=172.16.1.2 P2=172.16.1.1 P2_NET=172.16.1.0 # Local Network IF3=eth2 … Read more
For your requirements the NAT mode should work for you, just as a reminder. NAT Mode : Your host computer (the Mac) will act as a gateway to the network for your virtual machines, nobody on your network (apart from the Mac) will be able to see them since they’re sitting in a separate network … Read more
I have done load balancing using both lartc.org and iptables methods, and I find that the iptables method is easier to understand and implement. The only downside is that you need a fairly recent iptables version to be able to use statistic module Let’s suppose a few things: LAN: eth0: 192.168.0.1/24 ISP1: eth1: 192.168.1.1/24, gateway: … Read more
You’re getting muddled in your thinking about how information flows between the layers of the TCP/IP protocol stack– between DNS and application layer protocols, specifically. You have one public IP address. Your DNS can certainly resolve both mail.example.com and example.com to the same public IP address. In general, the IP datagrams containing requests to your … Read more
You can check Amazon’s script to configure NAT on a Linux machine, it comes with their default ami-vpc-nat AMI, in /usr/local/sbin/configure-pat.sh It looks like this: #!/bin/bash # Configure the instance to run as a Port Address Translator (PAT) to provide # Internet connectivity to private instances. function log { logger -t “vpc” — $1; } … Read more
It’s important first to know how Network Address Translation (NAT) works. You establish a connection to a server on the internet. In reality you send packets to your router, going out from your computer on some randomly chosen port: Your computer Router ╔════════════╗ ╔═══════════╗ ║ ║ ║ ║ ║ port 31746 ╫====>╫ ║ ║ ║ … Read more
The error message: Ping: sendmsg: operation not permitted means that your server is not allowed to send ICMP packets. You need to allow your server to send traffic via one or more of the configured interfaces. You can do this by: Set OUTPUT chain policy to ACCEPT to allow all outgoing traffic from your box: … Read more
Is that how IPv6 is intended to work? In short, yes. One of the primary reasons for increasing the address space so drastically with IPv6 is to get rid of band-aid technologies like NAT and make network routing simpler. But don’t confuse the concept of a public address and a publicly accessible host. There will … Read more