I think the syntax is IP:Netmask What does the whole of your /etc/ppp/options.ttyS2 look like? Is crt... (the hw flow control keyword) on its own line? Hugh > /var/log/messages file (until the pppd process dies). I assigned IP > address in the /etc/ppp/options.ttyS2 file as 192.168.0.1:192.168.0.2.