OpenVPN TAP (Pings)

H2oMaN1990

Hello,

I have just configured an openvpn server on ubuntu.
I have a strange issue.

My client can connect to the vpn server and ping the vpn server, but i cannot ping any devices on the network.
But i have made routes and these devices can ping the client on the other side of the network.

tcpdump -i tap0 -n host 172.26.66.80

root@vpn:~# tcpdump -i tap0 -n host 172.26.66.80
tcpdump: WARNING: tap0: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on tap0, link-type EN10MB (Ethernet), capture size 65535 bytes
15:41:02.421110 ARP, Request who-has 172.26.66.36 (00:50:56:8d:c5:69) tell 172.26.66.80, length 28
15:41:06.032550 IP 172.26.66.36 > 172.26.66.80: ICMP echo request, id 1, seq 19004, length 40
15:41:06.099881 IP 172.26.66.80 > 172.26.66.36: ICMP echo reply, id 1, seq 19004, length 40
15:41:07.033849 IP 172.26.66.36 > 172.26.66.80: ICMP echo request, id 1, seq 19005, length 40
15:41:07.123004 IP 172.26.66.80 > 172.26.66.36: ICMP echo reply, id 1, seq 19005, length 40
15:41:08.034765 IP 172.26.66.36 > 172.26.66.80: ICMP echo request, id 1, seq 19006, length 40
15:41:08.104046 IP 172.26.66.80 > 172.26.66.36: ICMP echo reply, id 1, seq 19006, length 40
15:41:09.035648 IP 172.26.66.36 > 172.26.66.80: ICMP echo request, id 1, seq 19007, length 40
15:41:09.109635 IP 172.26.66.80 > 172.26.66.36: ICMP echo reply, id 1, seq 19007, length 40

OpenVPN server is 172.26.66.36 inside lan was 172.26.66.208
But when i try to ping from the client 66.80 to 208

root@vpn:~# tcpdump -i tap0 -n host 172.26.66.80
tcpdump: WARNING: tap0: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on tap0, link-type EN10MB (Ethernet), capture size 65535 bytes
15:46:07.030998 IP 172.26.66.80.21880 > 81.217.120.55.6889: UDP, length 287
15:46:07.422331 ARP, Request who-has 172.26.66.208 tell 172.26.66.80, length 28
15:46:08.420140 ARP, Request who-has 172.26.66.208 tell 172.26.66.80, length 28
15:46:09.418511 ARP, Request who-has 172.26.66.208 tell 172.26.66.80, length 28
15:46:10.417208 ARP, Request who-has 172.26.66.208 tell 172.26.66.80, length 28
15:46:11.415328 ARP, Request who-has 172.26.66.208 tell 172.26.66.80, length 28
15:46:12.414952 ARP, Request who-has 172.26.66.208 tell 172.26.66.80, length 28
15:46:13.412680 ARP, Request who-has 172.26.66.208 tell 172.26.66.80, length 28
15:46:14.410531 ARP, Request who-has 172.26.66.208 tell 172.26.66.80, length 28
15:46:15.408822 ARP, Request who-has 172.26.66.208 tell 172.26.66.80, length 28
15:46:16.422800 ARP, Request who-has 172.26.66.208 tell 172.26.66.80, length 28
15:46:17.420758 ARP, Request who-has 172.26.66.208 tell 172.26.66.80, length 28
15:46:19.419567 ARP, Request who-has 172.26.66.208 tell 172.26.66.80, length 28

I also find it weird i have a service on 172.26.66.100 i can access the webpage fine no problem, but i cannot ping this service. but the server running on 66.100 does ping as same as my other 66.208

From my domain controller also i can ping 66.80. but i cannot access no file share.

Traffic

Please see the Forum rules (top of page)

H2oMaN1990

Sorry forgot to add.

I have configured with TUN worked perfectly for windows shares etc etc. Traffic flowed just fine.

But i could not get my Softphone working no matter what. It could bot register to the PBX.

Basicly what i want is for the TAP to work so i can try and see if i can get SIP up and running.

H2oMaN1990

End up figuring out.

Final product was OpenVPN configured as TUN over UDP.
And Configure SIP on TCP.

Thank you for your support.