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Re: [Openvpn-users] tcp-{client,server} works, udp NOT


  • Subject: Re: [Openvpn-users] tcp-{client,server} works, udp NOT
  • From: Frank Elsner <frank@xxxxxxxxxxxxxxxxxxxxx>
  • Date: Sat, 10 Apr 2004 18:12:26 +0200

On Sat, 10 Apr 2004 11:17:32 EDT Doug Lytle wrote:
> It would be helpful if you were to give us some more info.  
> Client/Server OS, what version of OpenVPN, snips from the actual logs, etc.
                                                            ^^^^^^^^^^^
>From the log

Apr  8 10:31:27 moltke openvpn[7590]: Current Parameter Settings:
Apr  8 10:31:27 moltke openvpn[7590]:   config = 'eyuphuro.cf'
Apr  8 10:31:27 moltke openvpn[7590]:   persist_config = DISABLED
Apr  8 10:31:27 moltke openvpn[7590]:   persist_mode = 1
Apr  8 10:31:27 moltke openvpn[7590]:   show_ciphers = DISABLED
Apr  8 10:31:27 moltke openvpn[7590]:   show_digests = DISABLED
Apr  8 10:31:27 moltke openvpn[7590]:   genkey = DISABLED
Apr  8 10:31:27 moltke openvpn[7590]:   askpass = DISABLED
Apr  8 10:31:27 moltke openvpn[7590]:   show_tls_ciphers = DISABLED
Apr  8 10:31:27 moltke openvpn[7590]:   proto = 0
Apr  8 10:31:27 moltke openvpn[7590]:   local = '[UNDEF]'
Apr  8 10:31:27 moltke openvpn[7590]:   remote = '194.95.AAA.BBB'
Apr  8 10:31:27 moltke openvpn[7590]:   local_port = 5000
Apr  8 10:31:27 moltke openvpn[7590]:   remote_port = 5000
Apr  8 10:31:27 moltke openvpn[7590]:   remote_float = DISABLED
Apr  8 10:31:27 moltke openvpn[7590]:   ipchange = '[UNDEF]'
Apr  8 10:31:27 moltke openvpn[7590]:   bind_local = ENABLED
Apr  8 10:31:27 moltke openvpn[7590]:   dev = 'tun'
Apr  8 10:31:27 moltke openvpn[7590]:   dev_type = '[UNDEF]'
Apr  8 10:31:27 moltke openvpn[7590]:   dev_node = '[UNDEF]'
Apr  8 10:31:27 moltke openvpn[7590]:   tun_ipv6 = DISABLED
Apr  8 10:31:27 moltke openvpn[7590]:   ifconfig_local = '10.192.168.28'
Apr  8 10:31:27 moltke openvpn[7590]:   ifconfig_remote_netmask = '10.192.168.56'
Apr  8 10:31:27 moltke openvpn[7590]:   ifconfig_noexec = DISABLED
Apr  8 10:31:27 moltke openvpn[7590]:   ifconfig_nowarn = DISABLED
Apr  8 10:31:27 moltke openvpn[7590]:   shaper = 0
Apr  8 10:31:27 moltke openvpn[7590]:   tun_mtu = 1300
Apr  8 10:31:27 moltke openvpn[7590]:   tun_mtu_defined = DISABLED
Apr  8 10:31:27 moltke openvpn[7590]:   link_mtu = 1300
Apr  8 10:31:27 moltke openvpn[7590]:   link_mtu_defined = ENABLED
Apr  8 10:31:28 moltke openvpn[7590]:   tun_mtu_extra = 0
Apr  8 10:31:28 moltke openvpn[7590]:   tun_mtu_extra_defined = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   fragment = 0
Apr  8 10:31:28 moltke openvpn[7590]:   mtu_discover_type = -1
Apr  8 10:31:28 moltke openvpn[7590]:   mtu_test = 0
Apr  8 10:31:28 moltke openvpn[7590]:   mlock = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   inactivity_timeout = 0
Apr  8 10:31:28 moltke openvpn[7590]:   ping_send_timeout = 0
Apr  8 10:31:28 moltke openvpn[7590]:   ping_rec_timeout = 0
Apr  8 10:31:28 moltke openvpn[7590]:   ping_rec_timeout_action = 0
Apr  8 10:31:28 moltke openvpn[7590]:   ping_timer_remote = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   persist_tun = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   persist_local_ip = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   persist_remote_ip = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   persist_key = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   mssfix_defined = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   mssfix = 0
Apr  8 10:31:28 moltke openvpn[7590]:   passtos = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   resolve_retry_seconds = 0
Apr  8 10:31:28 moltke openvpn[7590]:   username = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   groupname = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   chroot_dir = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   cd_dir = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   writepid = 'eyuphuro.pid'
Apr  8 10:31:28 moltke openvpn[7590]:   up_script = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   down_script = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   up_restart = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   daemon = ENABLED
Apr  8 10:31:28 moltke openvpn[7590]:   inetd = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   log = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   nice = 0
Apr  8 10:31:28 moltke openvpn[7590]:   verbosity = 8
 Apr  8 10:31:28 moltke openvpn[7590]:   mute = 0
Apr  8 10:31:28 moltke openvpn[7590]:   gremlin = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   tuntap_flags = 0
Apr  8 10:31:28 moltke openvpn[7590]:   occ = ENABLED
Apr  8 10:31:28 moltke openvpn[7590]:   http_proxy_server = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   http_proxy_port = 0
Apr  8 10:31:28 moltke openvpn[7590]:   http_proxy_auth_method = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   http_proxy_auth_file = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   http_proxy_retry = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   comp_lzo = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   comp_lzo_adaptive = ENABLED
Apr  8 10:31:28 moltke openvpn[7590]:   route_script = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   route_default_gateway = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   route_noexec = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   route_delay = 0
Apr  8 10:31:28 moltke openvpn[7590]:   route_delay_defined = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   shared_secret_file = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   key_direction = 0
Apr  8 10:31:28 moltke openvpn[7590]:   ciphername_defined = ENABLED
Apr  8 10:31:28 moltke openvpn[7590]:   ciphername = 'BF-CBC'
Apr  8 10:31:28 moltke openvpn[7590]:   authname_defined = ENABLED
Apr  8 10:31:28 moltke openvpn[7590]:   authname = 'SHA1'
Apr  8 10:31:28 moltke openvpn[7590]:   keysize = 0
Apr  8 10:31:28 moltke openvpn[7590]:   replay = ENABLED
Apr  8 10:31:28 moltke openvpn[7590]:   replay_window = 64
Apr  8 10:31:28 moltke openvpn[7590]:   replay_time = 15
Apr  8 10:31:28 moltke openvpn[7590]:   packet_id_file = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   use_iv = ENABLED
Apr  8 10:31:28 moltke openvpn[7590]:   test_crypto = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   tls_server = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   tls_client = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   key_method = 1
Apr  8 10:31:28 moltke openvpn[7590]:   ca_file = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   dh_file = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   cert_file = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   priv_key_file = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   cipher_list = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   tls_verify = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   tls_remote = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   crl_file = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]:   tls_timeout = 2
Apr  8 10:31:28 moltke openvpn[7590]:   renegotiate_bytes = 0
Apr  8 10:31:28 moltke openvpn[7590]:   renegotiate_packets = 0
Apr  8 10:31:28 moltke openvpn[7590]:   renegotiate_seconds = 3600
Apr  8 10:31:28 moltke openvpn[7590]:   handshake_window = 60
Apr  8 10:31:28 moltke openvpn[7590]:   transition_window = 3600
Apr  8 10:31:28 moltke openvpn[7590]:   single_session = DISABLED
Apr  8 10:31:28 moltke openvpn[7590]:   tls_auth_file = '[UNDEF]'
Apr  8 10:31:28 moltke openvpn[7590]: OpenVPN 1.5.0 i686-pc-linux-gnu [SSL] [LZO] [PTHREAD] built on Apr  6 2004
Apr  8 10:31:28 moltke openvpn[7590]: ******* WARNING *******: all encryption and authentication features disabled -- all data will be tunnelled as cleartext
Apr  8 10:31:28 moltke openvpn[7590]: TUN/TAP device tun0 opened
Apr  8 10:31:28 moltke openvpn[7590]: /sbin/ifconfig tun0 10.192.168.28 pointopoint 10.192.168.56 mtu 1300
Apr  8 10:31:29 moltke openvpn[7590]: Data Channel MTU parms [ L:1300 D:1300 EF:0 EB:0 ET:0 ]
Apr  8 10:31:29 moltke openvpn[7590]: Local Options String: 'V3,dev-type tun,link-mtu 1300,tun-mtu 1300,proto UDPv4,ifconfig 10.192.168.56 10.192.168.28'
Apr  8 10:31:29 moltke openvpn[7590]: Expected Remote Options String: 'V3,dev-type tun,link-mtu 1300,tun-mtu 1300,proto UDPv4,ifconfig 10.192.168.28 10.192.168.56'
Apr  8 10:31:29 moltke openvpn[7590]: Local Options hash (VER=V3): '06d68373'
Apr  8 10:31:29 moltke openvpn[7590]: Expected Remote Options hash (VER=V3): '77dc223b'
Apr  8 10:31:29 moltke openvpn[7592]: PTHREAD support initialized
Apr  8 10:31:29 moltke openvpn[7592]: UDPv4 link local (bound): [undef]:5000
Apr  8 10:31:29 moltke openvpn[7592]: UDPv4 link remote: 194.95.AAA.BBB:5000
Apr  8 10:31:39 moltke openvpn[7592]: UDPv4 WRITE [17] to 194.95.AAA.BBB:5000:  DATA len=17
Apr  8 10:32:03 moltke openvpn[7592]: UDPv4 WRITE [84] to 194.95.AAA.BBB:5000:  DATA len=84
Apr  8 10:32:04 moltke openvpn[7592]: UDPv4 WRITE [84] to 194.95.AAA.BBB:5000                                                      

No data flow over the tunnel. Switching to TCP, regardsless of which host
is server and which is client all works perfect.

Both hosts RedHat Linux 7.3, openvpn 1.5.0
One host kernel 2.4.25 the other 2.4.22

BTW:    Host A : netcat -l -u -p 5000
        Host B : netcat -w 8 -u <PubIP-of-A> 5000

        works perfect, as well as using netcat with server-/client side 
                                                                   changed.
--Frank Elsner




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