Linux IPv6 command cheatsheet

Giovanni — Fri, 05 Mar 2021 05:02:14 +0000

This post is intended to be a quick note to self on linux IPv6 commands, for quick reference when needed.

# Find the route decision for a given address.
ip route get 2a00:1450:4001:820::200e

ip -6 route
route -A inet6 (apt-get install net-tools) # equivalent to netstat -rn -A inet6
netstat -A inet6 -rn
netstat -r
ip -6 route show table 51820
ip -6 neigh
ip -6 neigh show proxy

# DHCPv6 release / renew
dhclient -6 -r ens18
dhclient -6 ens18

# Flush IPv6 neighbors cache
ip -family inet6 neigh flush any

# Find the route decision for a given address.
ip route get 2a00:1450:4001:820::200e

# Request a router advertisement (apt-get install -y ndisc6)
rdisc6 eth0

# Perform a Neighbor Solicitation (arp IPv4 equivalent) (apt-get install -y ndisc6)
ndisc6 2001:db8::42 eth0

# ping multicast address to have all link-local hosts to respond.
ping ff02::1%eth0

Good articles about IPv6:

IPv6 range blocks
IPv6 unicast, anycast, multicast – well known addresses.

Troubleshooting tools:

IPv6 ping from multiple locations.

Bonus section ‘ufw’ firewall

Check status of firewall and enable or disable.
# ufw status
# ufw enable
# ufw disable

View firewall rules and number to delete a specific rule.
# ufw status verbose
# ufw status numbered

Delete a firewall rule (from number of last cmd)
# ufw delete 12

Rules needed to allow IPv6 routing via wireguard to endpoint (no iptables forwarding would be needed on IPv6 as the other peer carries the public IP – they also should implement a firewall before using the below command!)
# ufw route allow in on eth0 out on wghub to 2602:xxx:730b:xxx:cafe::12

IPv4 firewall and routing rule to open Plex Media Server port 32400 and internal IPv4 space of wireguard peer.
# ufw allow in on eth0 out on wghub to 10.100.100.11 port 32400
# ufw route allow in on eth0 out on wghub to 10.100.100.11 port 32400

Add rule and get logs for matches of that rule:
# ufw allow log proto any from any to 192.168.1.x

View logs:
# tail -f /var/log/ufw.log

Extra bonus iptables NAT forwarding

On VPS (public endpoint) forward IPv4 traffic on tcp/32400 to wireguard peer. (recall IPv6 doesn’t need a rule)
# iptables -A PREROUTING -t nat -i eth0 -p tcp –dport 32400 -j DNAT –to 10.100.100.11:32400

Test your port forwards

For IPv6 I use:
http://www.ipv6scanner.com/cgi-bin/main.py

For IPv4:
https://www.yougetsignal.com/tools/open-ports/

dhclient – Giovanni F. Mazzeo De Santolo

Linux IPv6 command cheatsheet

Bonus section ‘ufw’ firewall

Extra bonus iptables NAT forwarding

Test your port forwards