ubuntu-ics notes

ubuntu-ics-notes.md

Notes on ICS from a VM

Some notes when I was working with ubuntu-ics. These might not be complete and are probably missing things

Hints

• remove/disable apparmor might help
• logs are in syslog (cat /var/log/syslog)

Config

• OS = Xubuntu (Ubuntu 18.04.1 LTS)
• enp0s3 = internet connection
• enp0s8 = client network

Helpful links

• https://serverfault.com/questions/525671/computer-gets-ip-from-dhcp-server-but-has-no-internet-connection
• https://www.hiroom2.com/2018/05/06/ubuntu-1804-isc-dhcp-server-en/

Steps

• apt install isc-dhcp-server
• nano /etc/default/isc-dhcp-server and set INTERFACESv4="enp0s8"
• cat dhcpd.conf (below)

ddns-update-style none;
log-facility local7;

subnet 192.168.1.0 netmask 255.255.255.0 {
  range 192.168.1.10 192.168.1.100;
  option domain-name "example.com";
  option domain-name-servers 192.168.1.1;
  option routers 192.168.1.1;
}

host pi {
  hardware ethernet 52:54:00:5e:7a:a4;
  fixed-address 192.168.1.250;
  option host-name "pi.example.com";
}

• sudo /etc/init.d/apparmor stop
• sudo systemctl enable isc-dhcp-server
• sudo systemctl restart isc-dhcp-server
• (not sure if needed) /sbin/iptables -P FORWARD ACCEPT
• (not sure if needed) /sbin/iptables --table nat -A POSTROUTING -o enp0s3 -j MASQUERADE
• (not sure if needed) sysctl -w net.ipv4.ip_forward=1