[ale] SMTP and firewall problems
Eric_Brubakken at aoncons.com
Eric_Brubakken at aoncons.com
Fri Feb 9 07:18:07 EST 2001
I am currently trying to configure my firewall at home and have run into a
problem with sending mail. Receiving mail is not a problem just sending - my
firewall script seems to rejecting everything from SMPT (port 25).
Does anyone see problems in the following code?
Thanks
Eric
Here is a snipit from my rc.firewall script:
LOOPBACK_INTERFACE="lo" # or your local naming convention
LOCAL_INTERFACE_1="eth1" # internal LAN interface
IPADDR="64.81.31.123" # your IP address
LOCALNET_1="192.168.0.0/24" # whatever private range you use
ANYWHERE="any/0" # match any IP address
NAMESERVER_1="216.254.95.2" # everyone must have at least
one
NAMESERVER_2="216.231.41.2"
UNPRIVPORTS="1024:65535"
------------------------------------------------------- problem child area -----------------------------------------------
# SMTP server (25)
# ----------------
/sbin/ipchains -A input -i $EXTERNAL_INTERFACE -p tcp \
-s $ANYWHERE $UNPRIVPORTS \
-d $IPADDR 25 -j ACCEPT
/sbin/ipchains -A output -i $EXTERNAL_INTERFACE -p tcp ! -y \
-s $IPADDR $UNPRIVPORTS \
-d $ANYWHERE 25 -j ACCEPT
------------------------------------------------------- problem child area -----------------------------------------------
dmesg produces the following:
Packet log: output REJECT eth0 PROTO=6 64.81.31.123:1569 216.32.243.136:25 L=60
S=0x00 I=11622 F=0x0000 T=64 SYN (#30)
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