On June 13, 2004 01:20 am, hanfamily@xxxxxxxxxxxxx wrote: > I bought a book on Linux firewalls and am working my way through > it. Unfortunately the examples are all written for someone with > a static IP address. I use dialup so my address changes each > time I log on. In their example for outgoing mail they > have > iptables -A OUTPUT -o $INTERNET -p tcp \ > -s $IPADDR --sport $UNPRIVPORTS \ > -d $SMTP_GATEWAY --dport 25 -m state --state NEW -j ACCEPT > Since my public ipaddr will change each time I log on would I just > use --sport $UNPRIVPORTS > also since earthlink only gives names not address for their smtp mail > server would I drop the reference to SMTP_GATEWAY and just use > --dport 25 -m state --state NEW -j ACCEPT > I really appreciate all the help. > Linda Hi Linda, If you need to extract your IP address, run something linke this: EXT_IP="`ifconfig $EXT_IF | grep inet | cut -d : -f 2 | cut -d \ -f 1`" You can test it as a command: ifconfig eth0 | grep inet | cut -d : -f 2 | cut -d \ -f 1 (or maybe you use use ppp0 for dialup) I don't have dialup, but it should work about the same for ppp0. $EXT_IF is your external interface, probably what you have as "$INTERNET" Hope that helps -- Pete Nesbitt, rhce -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
