boot the live cd
You can install the system to a local hard disk using the installation program. To install the system:
Login: root
Password: vyatta
# install-system

after install/reboot login again and:

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configure

set interfaces ethernet eth0 address dhcp

set  service ssh allow-root true

set system hostname rtr-1

set system package repository community-testing components main
set system package repository community-testing distribution testing
set system package repository community-testing url http://packages.vyatta.com/vyatta

set system package repository lenny components "main contrib"
set system package repository lenny distribution lenny
set system package repository lenny url http://ftp.het.net/debian

commit

save
exit (configure)

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cat <<EOF >> /etc/apt/preferences
Explanation: Prefer packages in Vyatta repositories over more recent versions in third-party repositories.
Package: *
Pin: release o=Vyatta
Pin-Priority: 990 
EOF

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cat <<EOF >> /etc/apt/apt.conf
Acquire::http::Proxy "http://cache.het.net:3142";
EOF
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full-upgrade