I need to change the default TTL of TCP/IP packets sent from my Ubuntu computer. I found the solution for Windows:
To make reg-file:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\servic es\Tcpip\Parameters]
"DefaultTTL"=dword:00000081
To execute this commands in console:
netsh int ipv4 set glob defaultcurhoplimit=129
netsh int ipv6 set glob defaultcurhoplimit=129
The question is how should I translate this solution for Ubuntu?
To change the default TTL of TCP/IP packets sent from your Linux computer you can run the following command:
sudo sysctl net.ipv4.ip_default_ttl=129
Or:
echo 129 | sudo tee /proc/sys/net/ipv4/ip_default_ttl
Or:
sudo bash -c 'echo 129 > /proc/sys/net/ipv4/ip_default_ttl'
But you have to run one of those commands whenever the computer boots. To make this setting persistent across reboots you could append the following line to the file /etc/sysctl.conf:
net.ipv4.ip_default_ttl=129