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How to configure Iptable to enable port forwarding
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The basic requirement: The iptable server can connect to mail server 10.1.2.3 on pop3s port 995, but a lot of internal/DMZ servers in 10.1.1.0/24 cannot connect to mail server on the port. I want to configure iptable server to play the NAT proxy to relay the traffic from 10.1.1.0/24 to 1.1.2.3:995.
When I configured the iptables on centos 6.9 with the below rules：
iptables -t nat -A PREROUTING -s 10.1.1.0/24 -i eth0 -p tcp -m tcp --dport 995 -j DNAT --to-destination 10.1.2.3:995
iptables -t nat -A POSTROUTING -s 10.1.1.0/24 -p tcp -m tcp --dport 995 -j MASQUERADE
I really succeeded in the network forwarding.
But when we upgrade the iptable server and internal/DMZ server to centos7.4, it cannot work well under the rule configuration.
The internal server's connecting to mail server will give the error message out like "bad file descriptor（connect:errno=9)".
The ipv4 forwarding is enabled in kernel, selinux is set to permissive.
linux iptables-redirect
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The basic requirement: The iptable server can connect to mail server 10.1.2.3 on pop3s port 995, but a lot of internal/DMZ servers in 10.1.1.0/24 cannot connect to mail server on the port. I want to configure iptable server to play the NAT proxy to relay the traffic from 10.1.1.0/24 to 1.1.2.3:995.
When I configured the iptables on centos 6.9 with the below rules：
iptables -t nat -A PREROUTING -s 10.1.1.0/24 -i eth0 -p tcp -m tcp --dport 995 -j DNAT --to-destination 10.1.2.3:995
iptables -t nat -A POSTROUTING -s 10.1.1.0/24 -p tcp -m tcp --dport 995 -j MASQUERADE
I really succeeded in the network forwarding.
But when we upgrade the iptable server and internal/DMZ server to centos7.4, it cannot work well under the rule configuration.
The internal server's connecting to mail server will give the error message out like "bad file descriptor（connect:errno=9)".
The ipv4 forwarding is enabled in kernel, selinux is set to permissive.
linux iptables-redirect
asked 3 mins ago
YanedannyYanedanny
1
New contributor
Yanedanny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
The basic requirement: The iptable server can connect to mail server 10.1.2.3 on pop3s port 995, but a lot of internal/DMZ servers in 10.1.1.0/24 cannot connect to mail server on the port. I want to configure iptable server to play the NAT proxy to relay the traffic from 10.1.1.0/24 to 1.1.2.3:995.
When I configured the iptables on centos 6.9 with the below rules：
iptables -t nat -A PREROUTING -s 10.1.1.0/24 -i eth0 -p tcp -m tcp --dport 995 -j DNAT --to-destination 10.1.2.3:995
iptables -t nat -A POSTROUTING -s 10.1.1.0/24 -p tcp -m tcp --dport 995 -j MASQUERADE
I really succeeded in the network forwarding.
But when we upgrade the iptable server and internal/DMZ server to centos7.4, it cannot work well under the rule configuration.
The internal server's connecting to mail server will give the error message out like "bad file descriptor（connect:errno=9)".
The ipv4 forwarding is enabled in kernel, selinux is set to permissive.
linux iptables-redirect
asked 3 mins ago
YanedannyYanedanny
1
New contributor
Yanedanny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
The basic requirement: The iptable server can connect to mail server 10.1.2.3 on pop3s port 995, but a lot of internal/DMZ servers in 10.1.1.0/24 cannot connect to mail server on the port. I want to configure iptable server to play the NAT proxy to relay the traffic from 10.1.1.0/24 to 1.1.2.3:995.
When I configured the iptables on centos 6.9 with the below rules：
iptables -t nat -A PREROUTING -s 10.1.1.0/24 -i eth0 -p tcp -m tcp --dport 995 -j DNAT --to-destination 10.1.2.3:995
iptables -t nat -A POSTROUTING -s 10.1.1.0/24 -p tcp -m tcp --dport 995 -j MASQUERADE
I really succeeded in the network forwarding.
But when we upgrade the iptable server and internal/DMZ server to centos7.4, it cannot work well under the rule configuration.
The internal server's connecting to mail server will give the error message out like "bad file descriptor（connect:errno=9)".
The ipv4 forwarding is enabled in kernel, selinux is set to permissive.
linux iptables-redirect
linux iptables-redirect
asked 3 mins ago
YanedannyYanedanny
1
New contributor
Yanedanny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
YanedannyYanedanny
1
New contributor
Yanedanny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
YanedannyYanedanny
1
New contributor
Yanedanny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
YanedannyYanedanny
1
asked 3 mins ago
YanedannyYanedanny
1
1
New contributor
Yanedanny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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New contributor
Yanedanny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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