Unable to ping between subnet

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monkfood
OpenVpn Newbie
Posts: 6
Joined: Sun Apr 24, 2022 4:38 pm

Unable to ping between subnet

Post by monkfood » Sun Apr 24, 2022 6:47 pm

I have setup my openvpn with a set of subnets following the description on https://openvpn.net/community-resources ... -policies/

I added a route to a new subnet 10.0.1.x

Code: Select all

    server 192.168.255.0 255.255.255.0
    ### Route Configurations Below
    route 10.0.1.0 255.255.255.0
There is a client inside the subnet with the static IP of 10.0.1.1 and I am connected in the server IP range 192.168.255.10 .

I also added an iptable rule

Code: Select all

    iptables -A FORWARD -i tun0 -s 192.168.255.0/24 -d 10.0.0.0/8 -j ACCEPT
so that all in my server subnet are allowed to access the whole 10.x.x.x subnet range.

But I am unable to ping the 10.0.1.1 unit when logged in as the 192.168.255.10.
**Can anyone give me a hint what i might have missed.**
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monkfood
OpenVpn Newbie
Posts: 6
Joined: Sun Apr 24, 2022 4:38 pm

Re: Unable to ping between subnet

Post by monkfood » Sat Apr 30, 2022 5:01 am

This is my openCPN configuration and log

Code: Select all

rtt min/avg/max/mdev = 0.059/0.074/0.090/0.017 ms
server 192.168.255.0 255.255.255.0
verb 3
key /etc/openvpn/pki/private/VPN.greenhive.at.key
ca /etc/openvpn/pki/ca.crt
cert /etc/openvpn/pki/issued/VPN.greenhive.at.crt
dh /etc/openvpn/pki/dh.pem
tls-auth /etc/openvpn/pki/ta.key
key-direction 0
keepalive 10 60
persist-key
persist-tun

proto udp
port 1194
dev tun
status /tmp/openvpn-status.log
topology subnet
client-config-dir ccd

user nobody
group nogroup
comp-lzo no

### Route Configurations Below
route 192.168.254.0 255.255.255.0
route 10.0.0.0 255.255.255.0
route 10.0.1.0 255.255.255.0
route 10.0.3.0 255.255.255.0

### Push Configurations Below
push "dhcp-option DNS 8.8.8.8"
push "dhcp-option DNS 8.8.4.4"
push "comp-lzo no"
push "route 172.17.0.0 255.255.255.0"
On the client side i get this log

Code: Select all

2022-04-30 06:24:38.983758 *Tunnelblick: macOS 12.3.1 (21E258); Tunnelblick 3.8.5beta05 (build 5650)
2022-04-30 06:24:39.446714 *Tunnelblick: Attempting connection with greenhive_master using shadow copy; Set nameserver = 769; monitoring connection
2022-04-30 06:24:39.450786 *Tunnelblick: openvpnstart start greenhive_master.tblk 52399 769 0 1 0 34652464 -ptADGNWradsgnw 2.4.10-openssl-1.1.1j
2022-04-30 06:24:39.477788 *Tunnelblick: openvpnstart starting OpenVPN
2022-04-30 06:24:39.857743 OpenVPN 2.4.10 x86_64-apple-darwin [SSL (OpenSSL)] [LZO] [LZ4] [PKCS11] [MH/RECVDA] [AEAD] built on Feb 25 2021
2022-04-30 06:24:39.857947 library versions: OpenSSL 1.1.1j  16 Feb 2021, LZO 2.10
2022-04-30 06:24:39.859534 MANAGEMENT: TCP Socket listening on [AF_INET]127.0.0.1:52399
2022-04-30 06:24:39.859562 Need hold release from management interface, waiting...
2022-04-30 06:24:40.078894 *Tunnelblick: openvpnstart log:
     OpenVPN started successfully.
     Command used to start OpenVPN (one argument per displayed line):
          /Applications/Tunnelblick.app/Contents/Resources/openvpn/openvpn-2.4.10-openssl-1.1.1j/openvpn
          --daemon
          --log /Library/Application Support/Tunnelblick/Logs/-SUsers-Srobertk-SLibrary-SApplication Support-STunnelblick-SConfigurations-Sgreenhive_master.tblk-SContents-SResources-Sconfig.ovpn.769_0_1_0_34652464.52399.openvpn.log
          --cd /Library/Application Support/Tunnelblick/Users/robertk/greenhive_master.tblk/Contents/Resources
          --machine-readable-output
          --setenv IV_GUI_VER "net.tunnelblick.tunnelblick 5650 3.8.5beta05 (build 5650)"
          --verb 3
          --config /Library/Application Support/Tunnelblick/Users/robertk/greenhive_master.tblk/Contents/Resources/config.ovpn
          --setenv TUNNELBLICK_CONFIG_FOLDER /Library/Application Support/Tunnelblick/Users/robertk/greenhive_master.tblk/Contents/Resources
          --verb 3
          --cd /Library/Application Support/Tunnelblick/Users/robertk/greenhive_master.tblk/Contents/Resources
          --management 127.0.0.1 52399 /Library/Application Support/Tunnelblick/geeielmngfddkiiidnhcaaaogadlpdifnpjaepip.mip
          --management-query-passwords
          --management-hold
          --script-security 2
          --route-up /Applications/Tunnelblick.app/Contents/Resources/client.up.tunnelblick.sh -9 -d -f -m -w -ptADGNWradsgnw
          --down /Applications/Tunnelblick.app/Contents/Resources/client.down.tunnelblick.sh -9 -d -f -m -w -ptADGNWradsgnw
2022-04-30 06:24:40.108790 MANAGEMENT: Client connected from [AF_INET]127.0.0.1:52399
2022-04-30 06:24:40.136505 MANAGEMENT: CMD 'pid'
2022-04-30 06:24:40.136565 MANAGEMENT: CMD 'auth-retry interact'
2022-04-30 06:24:40.136595 MANAGEMENT: CMD 'state on'
2022-04-30 06:24:40.136615 MANAGEMENT: CMD 'state'
2022-04-30 06:24:40.136655 MANAGEMENT: CMD 'bytecount 1'
2022-04-30 06:24:40.138068 *Tunnelblick: Established communication with OpenVPN
2022-04-30 06:24:40.152091 *Tunnelblick: >INFO:OpenVPN Management Interface Version 1 -- type 'help' for more info
2022-04-30 06:24:40.154175 MANAGEMENT: CMD 'hold release'
2022-04-30 06:24:40.155529 NOTE: the current --script-security setting may allow this configuration to call user-defined scripts
2022-04-30 06:24:40.161486 Outgoing Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication
2022-04-30 06:24:40.161545 Incoming Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication
2022-04-30 06:24:40.161718 MANAGEMENT: >STATE:1651292680,RESOLVE,,,,,,
2022-04-30 06:24:40.259123 TCP/UDP: Preserving recently used remote address: [AF_INET]xx.xx.xx.xx:1194
2022-04-30 06:24:40.259272 Socket Buffers: R=[786896->786896] S=[9216->9216]
2022-04-30 06:24:40.259296 UDP link local: (not bound)
2022-04-30 06:24:40.259311 UDP link remote: [AF_INET]xx.xx.xx.xx:1194
2022-04-30 06:24:40.259354 MANAGEMENT: >STATE:1651292680,WAIT,,,,,,
2022-04-30 06:24:40.305386 MANAGEMENT: >STATE:1651292680,AUTH,,,,,,
2022-04-30 06:24:40.305631 TLS: Initial packet from [AF_INET]xx.xx.xx.xx:1194, sid=06c4262e 884c5cdc
2022-04-30 06:24:40.369493 VERIFY OK: depth=1, CN=greenhive
2022-04-30 06:24:40.370236 VERIFY KU OK
2022-04-30 06:24:40.370275 Validating certificate extended key usage
2022-04-30 06:24:40.370301 ++ Certificate has EKU (str) TLS Web Server Authentication, expects TLS Web Server Authentication
2022-04-30 06:24:40.370323 VERIFY EKU OK
2022-04-30 06:24:40.370346 VERIFY OK: depth=0, CN=VPN.greenhive.at
2022-04-30 06:24:40.439317 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1541', remote='link-mtu 1542'
2022-04-30 06:24:40.439596 WARNING: 'comp-lzo' is present in remote config but missing in local config, remote='comp-lzo'
2022-04-30 06:24:40.439767 Control Channel: TLSv1.3, cipher TLSv1.3 TLS_AES_256_GCM_SHA384, 2048 bit RSA
2022-04-30 06:24:40.439834 [VPN.greenhive.at] Peer Connection Initiated with [AF_INET]xx.xx.xx.xx:1194
2022-04-30 06:24:41.558800 MANAGEMENT: >STATE:1651292681,GET_CONFIG,,,,,,
2022-04-30 06:24:41.559492 SENT CONTROL [VPN.greenhive.at]: 'PUSH_REQUEST' (status=1)
2022-04-30 06:24:41.652600 PUSH: Received control message: 'PUSH_REPLY,dhcp-option DNS 8.8.8.8,dhcp-option DNS 8.8.4.4,comp-lzo no,route 172.17.0.0 255.255.255.0,route-gateway 192.168.255.1,topology subnet,ping 10,ping-restart 60,ifconfig 192.168.255.2 255.255.255.0,peer-id 1,cipher AES-256-GCM'
2022-04-30 06:24:41.652921 OPTIONS IMPORT: timers and/or timeouts modified
2022-04-30 06:24:41.652958 OPTIONS IMPORT: compression parms modified
2022-04-30 06:24:41.652985 OPTIONS IMPORT: --ifconfig/up options modified
2022-04-30 06:24:41.653008 OPTIONS IMPORT: route options modified
2022-04-30 06:24:41.653030 OPTIONS IMPORT: route-related options modified
2022-04-30 06:24:41.653051 OPTIONS IMPORT: --ip-win32 and/or --dhcp-option options modified
2022-04-30 06:24:41.653072 OPTIONS IMPORT: peer-id set
2022-04-30 06:24:41.653094 OPTIONS IMPORT: adjusting link_mtu to 1624
2022-04-30 06:24:41.653115 OPTIONS IMPORT: data channel crypto options modified
2022-04-30 06:24:41.653139 Data Channel: using negotiated cipher 'AES-256-GCM'
2022-04-30 06:24:41.653816 Outgoing Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit key
2022-04-30 06:24:41.653851 Incoming Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit key
2022-04-30 06:24:41.654722 Opening utun (connect(AF_SYS_CONTROL)): Resource busy (errno=16)
2022-04-30 06:24:41.654977 Opening utun (connect(AF_SYS_CONTROL)): Resource busy (errno=16)
2022-04-30 06:24:41.655036 Opening utun (connect(AF_SYS_CONTROL)): Resource busy (errno=16)
2022-04-30 06:24:41.655181 Opened utun device utun3
2022-04-30 06:24:41.655203 MANAGEMENT: >STATE:1651292681,ASSIGN_IP,,192.168.255.2,,,,
2022-04-30 06:24:41.655217 /sbin/ifconfig utun3 delete
                           ifconfig: ioctl (SIOCDIFADDR): Can't assign requested address
2022-04-30 06:24:41.665109 NOTE: Tried to delete pre-existing tun/tap instance -- No Problem if failure
2022-04-30 06:24:41.666818 /sbin/ifconfig utun3 192.168.255.2 192.168.255.2 netmask 255.255.255.0 mtu 1500 up
2022-04-30 06:24:41.672645 /sbin/route add -net 192.168.255.0 192.168.255.2 255.255.255.0
                           add net 192.168.255.0: gateway 192.168.255.2
2022-04-30 06:24:41.679237 MANAGEMENT: >STATE:1651292681,ADD_ROUTES,,,,,,
2022-04-30 06:24:41.679318 /sbin/route add -net 172.17.0.0 192.168.255.1 255.255.255.0
                           add net 172.17.0.0: gateway 192.168.255.1
                           06:24:41 *Tunnelblick:  **********************************************
                           06:24:41 *Tunnelblick:  Start of output from client.up.tunnelblick.sh
                           06:24:43 *Tunnelblick:  Retrieved from OpenVPN: name server(s) [ 8.8.8.8 8.8.4.4 ], search domain(s) [ ] and SMB server(s) [ ] and using default domain name [ openvpn ]
                           06:24:44 *Tunnelblick:  WARNING: Ignoring DomainName 'openvpn' because DomainName was set manually and '-allowChangesToManuallySetNetworkSettings' was not specified
                           06:24:44 *Tunnelblick:  WARNING: Ignoring ServerAddresses '8.8.8.8 8.8.4.4' because ServerAddresses was set manually and '-allowChangesToManuallySetNetworkSettings' was not specified
                           06:24:44 *Tunnelblick:  Setting search domains to '8.8.8.8 8.8.4.4' because the search domains were not set manually (or are allowed to be changed) and 'Prepend domain name to search domains' was not selected
                           06:24:45 *Tunnelblick:  Saved the DNS and SMB configurations so they can be restored
                           06:24:45 *Tunnelblick:  Did not change DNS ServerAddresses setting of '8.8.8.8 8.8.4.4' (but re-set it)
                           06:24:45 *Tunnelblick:  Changed DNS SearchDomains setting from 'openvpn' to '8.8.8.8 8.8.4.4'
                           06:24:45 *Tunnelblick:  Changed DNS DomainName setting from '' to '8.8.8.8 8.8.4.4'
                           06:24:45 *Tunnelblick:  Did not change SMB NetBIOSName setting of ''
                           06:24:45 *Tunnelblick:  Did not change SMB Workgroup setting of ''
                           06:24:45 *Tunnelblick:  Did not change SMB WINSAddresses setting of ''
                           06:24:45 *Tunnelblick:  DNS servers '8.8.8.8 8.8.4.4' were set manually
                           06:24:45 *Tunnelblick:  DNS servers '8.8.8.8 8.8.4.4' will be used for DNS queries when the VPN is active
                           06:24:45 *Tunnelblick:  The DNS servers include only free public DNS servers known to Tunnelblick.
                           06:24:45 *Tunnelblick:  Flushed the DNS cache via dscacheutil
                           06:24:45 *Tunnelblick:  /usr/sbin/discoveryutil not present. Not flushing the DNS cache via discoveryutil
                           06:24:45 *Tunnelblick:  Notified mDNSResponder that the DNS cache was flushed
                           06:24:45 *Tunnelblick:  Not notifying mDNSResponderHelper that the DNS cache was flushed because it is not running
                           06:24:45 *Tunnelblick:  Setting up to monitor system configuration with process-network-changes
                           06:24:45 *Tunnelblick:  End of output from client.up.tunnelblick.sh
                           06:24:45 *Tunnelblick:  **********************************************
2022-04-30 06:24:45.352811 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this
2022-04-30 06:24:45.352830 Initialization Sequence Completed
2022-04-30 06:24:45.352845 MANAGEMENT: >STATE:1651292685,CONNECTED,SUCCESS,192.168.255.2,xx.xx.xx.xx,1194,,
2022-04-30 06:24:46.571157 *Tunnelblick: Routing info stdout:
   route to: 8.8.4.4
destination: 8.8.4.4
    gateway: 192.168.88.1
  interface: en0
      flags: <UP,GATEWAY,HOST,DONE,WASCLONED,IFSCOPE,IFREF,GLOBAL>
 recvpipe  sendpipe  ssthresh  rtt,msec    rttvar  hopcount      mtu     expire
       0         0         0         0         0         0      1500         0 
stderr:

2022-04-30 06:24:46.593014 *Tunnelblick: Warning: DNS server Address 8.8.4.4 is a known public DNS server but is not being routed through the VPN
2022-04-30 06:24:46.680197 *Tunnelblick: Routing info stdout:
   route to: 8.8.8.8
destination: 8.8.8.8
    gateway: 192.168.88.1
  interface: en0
      flags: <UP,GATEWAY,HOST,DONE,WASCLONED,IFSCOPE,IFREF,GLOBAL>
 recvpipe  sendpipe  ssthresh  rtt,msec    rttvar  hopcount      mtu     expire
       0         0         0         0         0         0      1500         0 
stderr:

2022-04-30 06:24:46.705581 *Tunnelblick: Warning: DNS server Address 8.8.8.8 is a known public DNS server but is not being routed through the VPN
the traceroute ends at the server gateway
% traceroute 10.0.0.1
traceroute to 10.0.0.1 (10.0.0.1), 64 hops max, 52 byte packets
1 192.168.88.1 (192.168.88.1) 12.279 ms 3.251 ms 1.882 ms
2 *

Also I have the same problem with the server 172.17.0.4 I advertise. I can not reach it although the firewall rule is set to
-A FORWARD -s 192.168.255.0/24 -d 10.0.0.0/8 -i tun0 -j ACCEPT
-A FORWARD -s 192.168.255.0/24 -d 172.17.0.0/24 -i tun0 -j ACCEPT
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