Can anyone show me how to filter (change bandwidth, delay, etc) of one or more users connecting to OpenVPN based on their Client Certificate Name?

Why I would like to use the Client Cert name is I could have 100's of users connecting to OpenVPN and I would like to individually limit the bandwidth of each client

Many thanks


You can use the directives client-connect <cmd> and client-disconnect <cmd>.

An environment variable $common_name is passed to the script specified at <cmd> and can be evaluated to use specific tc settings on that particular client as follows:


if [ "$common_name" == "client1" ]; then
  elif [ "$common_name" == "client2" ]; then

tc qdisc add dev "$dev" root handle 1: htb
tc qdisc add dev "$dev" handle ffff: ingress

# Limit traffic from VPN server to client
tc class add dev "$dev" parent 1: classid 1:1 htb rate "$downrate"
tc filter add dev "$dev" parent 1:0 protocol ip prio 1 \
  u32 match ip dst "$ifconfig_pool_remote_ip"/32 flowid 1:1

# Limit traffic from client to VPN server
tc filter add dev "$dev" parent ffff:0 protocol ip prio 1 \
  u32 match ip src "$ifconfig_pool_remote_ip"/32 \
  police rate "$uprate" burst 80k drop flowid :1

The following environment variables are relevant:

  • $common_name: containing the client CN-name
  • $ifconfig_pool_remote_ip: containing the client remote vpn IP
  • $dev: containing the tun interface

A detailed setup can be found in this answer.

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Not the answer you're looking for? Browse other questions tagged or ask your own question.