Guardian Não inicializa.

o snort ta funcionando blz, ta criando os arquivos de log tudo certo, mas quando tento inicializa o guardian da erro, já deixei o conf do jeito que ta nos howtos.

suporte:/etc# guardian.pl -c /etc/guardian.conf
OS shows Linux
Warning! HostIpAddr is undefined! Attempting to guess..
Couldn't figure out the ip address

é esse erro que da, o conf ta aassim

guardian.conf
Interface eth0

# The last octet of the ip address, which gives us the gateway address.
HostGatewayByte 1

# Guardian's log file
LogFile /var/log/guardian.log

# Snort's alert file. This can be the snort.alert file, or a syslog file
# There might be some snort alerts that get logged to syslog which guardian
# might not see..
AlertFile /var/lag/alert

# The list of ip addresses to ignore
IgnoreFile /etc/guardian.ignore

# The time in seconds to keep a host blocked. If undefined, it defaults to
# 99999999, which basicly disables the feature.
TimeLimit 99999


ta faltando oq pra o guardian rodar?

uso debian
kernel 2.4
guardian 1.6