On Ubuntu 7.10, install vpnc package. /etc/vpnc/netscreen.conf IPSec gateway xxx.xxx.xxx.xxx IPSec ID "XXXXXXXXXXXXX" IPSec secret xxxxxxxxxxxx Vendor netscreen Perfect Forward Secrecy dh2 Xauth username xxxxxxxx Xauth password xxxxxxxx #Debug 3 In /etc/vpnc/vpnc-script Put following before set -x INTERNAL_IP4_DNS= CISCO_SPLIT_INC=1 CISCO_SPLIT_INC_0_ADDR=xxx.xxx.xxx.0 CISCO_SPLIT_INC_0_MASK=255.255.252.0 CISCO_SPLIT_INC_0_MASKLEN=22 CISCO_SPLIT_INC_0_PROTOCOL=0 CISCO_SPLIT_INC_0_SPORT=0 CISCO_SPLIT_INC_0_DPORT=0 Create a version for /etc/resolv.conf.thuis, /etc/resolv.conf.sungard. Create aliases: alias sungard-vpn-down='sudo /usr/sbin/vpnc-disconnect; sudo cp /etc/resolv.conf.thuis /etc/resolv.conf' alias sungard-vpn-up='sudo /usr/sbin/vpnc /etc/vpnc/netscreen.conf; sudo cp /etc/resolv.conf.sungard /etc/resolv.conf'