RE: connecting to a SMTP/POP server on the internet

RE: connecting to a SMTP/POP server on the internet

[George Vieira]

Can you do it from the linux box? Are you running DSL, which by then you need to lower your outgoing MTU?
Have you logged any packets?
Have you run a tcpdump?

and the list goes on.....

Thanks,
____________________________________________
George Vieira
Systems Manager
georgev@citadelcomputer.com.au

Citadel Computer Systems Pty Ltd
http://www.citadelcomputer.com.au


-----Original Message-----
From: system administrator [mailto:sysadmails@yahoo.com]
Sent: Thursday, July 17, 2003 1:11 AM
To: netfilter@lists.netfilter.org
Subject: connecting to a SMTP/POP server on the internet 


Hi there,

We want to connect to a SMTP/POP server on the
internet from our LAN with:
                                                      
                         
iptables -A FORWARD -i eth0 -p tcp -j ACCEPT
iptables -A FORWARD -i eth0 -p udp -j ACCEPT
iptables -A FORWARD -j DROP
iptables -t nat -o eth1 -A POSTROUTING -j MASQUERADE
                                                      
                         
When we try to access from the workstation to the POP
server we get a message: 'connection to x.com timed
out', we can however access the mail on the firewall -
even if the connection is slow.
                                                      
                         
Please help us out ...
                                                      
                         
# Our general setup:
# RedHat 8.0 firewall with iptables installed on PII
400MHz
# eth0 = our LAN and eth1 = Internet
# cat /proc/sys/net/ipv4/ip_forward => 1
# gateway on workstation in LAN pointing to firewall
# gateway defined for eth1 pointing to router

Thanks in advance,

Frank

__________________________________
Do you Yahoo!?
SBC Yahoo! DSL - Now only $29.95 per month!
http://sbc.yahoo.com

connecting to a SMTP/POP server on the internet

[system administrator]

Hi there,

We want to connect to a SMTP/POP server on the
internet from our LAN with:
                                                      
                         
iptables -A FORWARD -i eth0 -p tcp -j ACCEPT
iptables -A FORWARD -i eth0 -p udp -j ACCEPT
iptables -A FORWARD -j DROP
iptables -t nat -o eth1 -A POSTROUTING -j MASQUERADE
                                                      
                         
When we try to access from the workstation to the POP
server we get a message: 'connection to x.com timed
out', we can however access the mail on the firewall -
even if the connection is slow.
                                                      
                         
Please help us out ...
                                                      
                         
# Our general setup:
# RedHat 8.0 firewall with iptables installed on PII
400MHz
# eth0 = our LAN and eth1 = Internet
# cat /proc/sys/net/ipv4/ip_forward => 1
# gateway on workstation in LAN pointing to firewall
# gateway defined for eth1 pointing to router

Thanks in advance,

Frank

__________________________________
Do you Yahoo!?
SBC Yahoo! DSL - Now only $29.95 per month!
http://sbc.yahoo.com