VPNC(8) System Administration Utilities VPNC(8) (NAME) vpnc - Cisco VPN3000 Concentrator IOS PIX (SYNOPSIS) vpnc [--version] [--print-config] [--help] [--long-help] [] [ ] (DESCRIPTION) vpnc vpnc-disconnect . vpnc VPN Cisco 3000 VPN IPSec . TUN/TAP 2.4 tun(4) BSD . . : ( XAUTH ) vpnc ! vpnc vpnc-script . vpnc-script . split-tunneling . (default-route) . (host route) . DHCP DHCP . vpnc-disconnect vpnc . (CONFIGURATION) : o o () o /etc/vpnc/default.conf o /etc/vpnc.conf o vpnc . . / /etc/vpnc/ /etc/vpnc/.conf . .conf . /etc/vpnc/default.conf /etc/vpnc.conf . "-" vpnc (stdin) . stdin CEOT ( CTRL-D) . (OPTIONS) ( ) . --gateway IP (gateway) IPSec : IPSec gateway --id : IPSec ID --secret ( ) : IPSec secret ( ) () : IPSec obfuscated secret --username : Xauth username --password ( ) : Xauth password ( ) () : Xauth obfuscated password --domain (NT-) : Domain --xauth-inter ( -) : Xauth interactive --vendor IPSec : cisco : Vendor --natt-mode NAT (NAT-Traversal) : o natt -- NAT-T RFC3947 o none -- NAT-T o force-natt -- NAT-T NAT ( ESP ) o cisco-udp -- UDP 10000 : cisco-tcp : natt : NAT Traversal Mode --script system() . IP README . ISAKMP . vpnc : /etc/vpnc/vpnc-script : Script --dh IKE DH : dh2 : IKE DH Group --pfs Diffie-Hellman PFS : server : Perfect Forward Secrecy --enable-1des : --enable-weak-encryption . : Enable Single DES --enable-weak-encryption ( DES 3DES) : Enable weak encryption --enable-no-encryption ( ) : Enable no encryption --enable-weak-authentication ( MD5) : Enable weak authentication --application-version . : . : Cisco Systems VPN Client 0.5.3:Linux : Application version --ifname TUN/TAP : Interface name --ifmode TUN/TAP: o tun: () o tap: : tun : Interface mode --ifmtu <0-65535> MTU TUN/TAP ( 0 == ) : Interface MTU <0-65535> --debug <0/1/2/3/99> o 0: . o 1: . o 2: / (payload). o 3: . o 99: ( ). : Debug <0/1/2/3/99> --no-detach : No Detach --pid-file (PID) : /run/vpnc.pid : Pidfile --local-addr IP ISAKMP / ESP / ... ( 0.0.0.0 == ) : 0.0.0.0 : Local Addr --local-port <0-65535> ISAKMP (0 == ) : 500 : Local Port <0-65535> --udp-port <0-65535> UDP (0 == ). NAT cisco-udp . __ UDP . cisco-tcp . : 10000 : Cisco UDP Encapsulation Port <0-65535> --dpd-idle <0,10-86400> DPD . 0 DPD ( ) . : 600 : DPD idle timeout (our side) <0,10-86400> --non-inter : Noninteractive --auth-mode : o psk: () o cert: + ( ) o hybrid: + xauth ( openssl ) : psk : IKE Authmode --ca-file CA-PEM : CA-File --ca-dir CA : /etc/ssl/certs : CA-Dir --target-network CIDR : 0.0.0.0/0.0.0.0 : IPSEC target network --password-helper : Password helper --print-config vpnc.conf (FILES) /etc/vpnc.conf /etc/vpnc/default.conf . IPSec secret Xauth password . IPSec obfuscated secret Xauth obfuscated password . . /etc/vpnc/*.conf vpnc ( .conf) . (EXAMPLES) vpnc.conf : IPSec gateway vpn.example.com IPSec ID ExampleVpnPSK IKE Authmode psk IPSec secret PskS3cret! Xauth username user@example.com Xauth password USecr3t (hybrid) ( vpnc openssl ): IPSec gateway vpn.example.com IPSec ID ExampleVpnHybrid IKE Authmode hybrid CA-Dir /etc/vpnc or CA-File /etc/vpnc/vpn-example-com.pem IPSec secret HybS3cret? Xauth username user@example.com Xauth password 123456 ( !). . ( CR LF NUL) . CA-Dir 722d15bd.X X . : openssl x509 -subject_hash -noout -in /etc/vpnc/vpn-example-com.pem --print-config . /etc/resolv.conf README vpnc . (AUTHOR) Eduard Bloch Christian Lackas README vpnc Maurice Massar . / 2 . /usr/share/common-licenses/GPL . (SEE ALSO) pcf2vpnc(1), cisco-decrypt(1), ip(8), ifconfig(8), route(1), http://www.unix-ag.uni-kl.de/~massar/vpnc vpnc version 0.5.3 March 2026 VPNC(8)