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while trying to diagnose a UDP multcast issue on an OpenVPN client configuration and I've come across this block in the config file:

# Use the same setting as you are using on
# the server.
# On most systems, the VPN will not function
# unless you partially or fully disable
# the firewall for the TUN/TAP interface.
;dev tap
dev tun

UFW does not seem to be installed (the ufw command is not found). What else should I check in order to ensure that this condition is met? Is my router's NAT configuration relevant?

Many thanks, blz

Louis Thibault
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1 Answers1

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Display IPv4 firewall rules:

  • iptables -L -nv - look at input chain,
  • iptables -P INPUT ACCEPT - this will change firewall policy to accept all packets,
  • iptables -F INPUT - flushing (deleting) all rules from the INPUT chain.

IPv6: Same parameters different command, instead iptables use ip6tables.

The above will ensure that packet filtering won't touch your traffic.

Michal Sokolowski
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