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+Usage: vpnc [--version] [--print-config] [--help] [--long-help] [options] [config files]
+
+Options:
+ --gateway <ip/hostname>
+ IP/name of your IPSec gateway
+ conf-variable: IPSec gateway <ip/hostname>
+
+ --id <ASCII string>
+ your group name
+ conf-variable: IPSec ID <ASCII string>
+
+ (configfile only option)
+ your group password (cleartext)
+ conf-variable: IPSec secret <ASCII string>
+
+ (configfile only option)
+ your group password (obfuscated)
+ conf-variable: IPSec obfuscated secret <hex string>
+
+ --username <ASCII string>
+ your username
+ conf-variable: Xauth username <ASCII string>
+
+ (configfile only option)
+ your password (cleartext)
+ conf-variable: Xauth password <ASCII string>
+
+ (configfile only option)
+ your password (obfuscated)
+ conf-variable: Xauth obfuscated password <hex string>
+
+ --domain <ASCII string>
+ (NT-) Domain name for authentication
+ conf-variable: Domain <ASCII string>
+
+ --xauth-inter
+ enable interactive extended authentication (for challenge response auth)
+ conf-variable: Xauth interactive
+
+ --vendor <cisco/netscreen>
+ vendor of your IPSec gateway
+ Default: cisco
+ conf-variable: Vendor <cisco/netscreen>
+
+ --natt-mode <natt/none/force-natt/cisco-udp>
+ Which NAT-Traversal Method to use:
+ * natt -- NAT-T as defined in RFC3947
+ * none -- disable use of any NAT-T method
+ * force-natt -- always use NAT-T encapsulation even
+ without presence of a NAT device
+ (useful if the OS captures all ESP traffic)
+ * cisco-udp -- Cisco proprietary UDP encapsulation, commonly over Port 10000
+ Note: cisco-tcp encapsulation is not yet supported
+ Default: natt
+ conf-variable: NAT Traversal Mode <natt/none/force-natt/cisco-udp>
+
+ --script <command>
+ command is executed using system() to configure the interface,
+ routing and so on. Device name, IP, etc. are passed using enviroment
+ variables, see README. This script is executed right after ISAKMP is
+ done, but before tunneling is enabled. It is called when vpnc
+ terminates, too
+ Default: /etc/vpnc/vpnc-script
+ conf-variable: Script <command>
+
+ --dh <dh1/dh2/dh5>
+ name of the IKE DH Group
+ Default: dh2
+ conf-variable: IKE DH Group <dh1/dh2/dh5>
+
+ --pfs <nopfs/dh1/dh2/dh5/server>
+ Diffie-Hellman group to use for PFS
+ Default: server
+ conf-variable: Perfect Forward Secrecy <nopfs/dh1/dh2/dh5/server>
+
+ --enable-1des
+ enables weak single DES encryption
+ conf-variable: Enable Single DES
+
+ --enable-no-encryption
+ enables using no encryption for data traffic (key exchanged must be encrypted)
+ conf-variable: Enable no encryption
+
+ --application-version <ASCII string>
+ Application Version to report. Note: Default string is generated at runtime.
+ Default: Cisco Systems VPN Client 0.5.3-394:Linux
+ conf-variable: Application version <ASCII string>
+
+ --ifname <ASCII string>
+ visible name of the TUN/TAP interface
+ conf-variable: Interface name <ASCII string>
+
+ --ifmode <tun/tap>
+ mode of TUN/TAP interface:
+ * tun: virtual point to point interface (default)
+ * tap: virtual ethernet interface
+ Default: tun
+ conf-variable: Interface mode <tun/tap>
+
+ --debug <0/1/2/3/99>
+ Show verbose debug messages
+ * 0: Do not print debug information.
+ * 1: Print minimal debug information.
+ * 2: Show statemachine and packet/payload type information.
+ * 3: Dump everything exluding authentication data.
+ * 99: Dump everything INCLUDING AUTHENTICATION data (e.g. PASSWORDS).
+ conf-variable: Debug <0/1/2/3/99>
+
+ --no-detach
+ Don't detach from the console after login
+ conf-variable: No Detach
+
+ --pid-file <filename>
+ store the pid of background process in <filename>
+ Default: /var/run/vpnc/pid
+ conf-variable: Pidfile <filename>
+
+ --local-addr <ip/hostname>
+ local IP to use for ISAKMP / ESP / ... (0.0.0.0 == automatically assign)
+ Default: 0.0.0.0
+ conf-variable: Local Addr <ip/hostname>
+
+ --local-port <0-65535>
+ local ISAKMP port number to use (0 == use random port)
+ Default: 500
+ conf-variable: Local Port <0-65535>
+
+ --udp-port <0-65535>
+ Local UDP port number to use (0 == use random port).
+ This is only relevant if cisco-udp nat-traversal is used.
+ This is the _local_ port, the remote udp port is discovered automatically.
+ It is especially not the cisco-tcp port.
+ Default: 10000
+ conf-variable: Cisco UDP Encapsulation Port <0-65535>
+
+ --dpd-idle <0,10-86400>
+ Send DPD packet after not receiving anything for <idle> seconds.
+ Use 0 to disable DPD completely (both ways).
+ Default: 300
+ conf-variable: DPD idle timeout (our side) <0,10-86400>
+
+ --non-inter
+ Don't ask anything, exit on missing options
+ conf-variable: Noninteractive
+
+ --auth-mode <psk/cert/hybrid>
+ Authentication mode:
+ * psk: pre-shared key (default)
+ * cert: server + client certificate (not implemented yet)
+ * hybrid: server certificate + xauth (if built with openssl support)
+ Default: psk
+ conf-variable: IKE Authmode <psk/cert/hybrid>
+
+ --ca-file <filename>
+ filename and path to the CA-PEM-File
+ conf-variable: CA-File <filename>
+
+ --ca-dir <directory>
+ path of the trusted CA-Directory
+ Default: /etc/ssl/certs
+ conf-variable: CA-Dir <directory>
+
+ --target-network <target network/netmask>
+ Target network in dotted decimal or CIDR notation
+ Default: 0.0.0.0/0.0.0.0
+ conf-variable: IPSEC target network <target network/netmask>
+
+Report bugs to vpnc@unix-ag.uni-kl.de