firewalld configuration to make EC2 Amazon Linux 2 a NATHow to configure a custom NAT for use in Amazon VPCCentOS iptables NAT, client cannot connect to WAN from LANAmazon VPC NAT not workingMake CentOS 6.x a port forwarding NAT deviceNAT doesnt work on CentOS 7(Firewalld)CentOS 7 firewall-cmd not foundAmazon Linux - iptables NAT rules not matching GRE trafficSetting up NAT with firewalld on Centos 7ssh port forwarding with firewall-cmdfirewalld port forwarding not working in centOSNeed correct iptable rules for NAT instance to prevent loop back for private subnet EC2 instance outgoing trafficLinux firewalld - I can hit port 4506, but my configuration shouldn't let me
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firewalld configuration to make EC2 Amazon Linux 2 a NAT
How to configure a custom NAT for use in Amazon VPCCentOS iptables NAT, client cannot connect to WAN from LANAmazon VPC NAT not workingMake CentOS 6.x a port forwarding NAT deviceNAT doesnt work on CentOS 7(Firewalld)CentOS 7 firewall-cmd not foundAmazon Linux - iptables NAT rules not matching GRE trafficSetting up NAT with firewalld on Centos 7ssh port forwarding with firewall-cmdfirewalld port forwarding not working in centOSNeed correct iptable rules for NAT instance to prevent loop back for private subnet EC2 instance outgoing trafficLinux firewalld - I can hit port 4506, but my configuration shouldn't let me
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Short question:
I'm trying to configure my own NAT instance on AWS, starting with a standard AWS Linux 2 instance, and it seems the new "right" way to configure things is with firewalld instead of iptables, so I'm looking for the equivalent to the answer to this question, but with firewalld.
Longer description:
I'm 99% sure I have my VPC, subnets, and routing tables configured correctly. On the ec2 instance, I've enabled IP4 forwarding, disabled ICMP forwarding, and disabled source/destination check.
I believe the only step I'm missing is that the old, community NAT Instance AMIs run a script on startup that does this:
(iptables -t nat -C POSTROUTING -o eth0 -s $VPC_CIDR_RANGE -j MASQUERADE 2> /dev/null ||
iptables -t nat -A POSTROUTING -o eth0 -s $VPC_CIDR_RANGE -j MASQUERADE ) ||
die
Based on this how-to, I'm attempting to replicate the same functionality with firewalld, and I've done
firewall-cmd --zone=internal --add-source=10.0.4.0/22
firewall-cmd --zone=external --add-interface=eth0
firewall-cmd --direct --passthrough ipv4 -t nat -I POSTROUTING -o eth0 -j MASQUERADE -s 10.0.4.0/22
I've also attempted to allow ping for testing purposes, with
firewall-cmd --permanent --direct --add-rule ipv4 filter INPUT 0 -p icmp -s 0.0.0.0/0 -d 0.0.0.0/0 -j ACCEPT
I can successfully ssh to the NAT Instance, I can ping the outside world from it, and I can ping it from the private subnet, but I can't ping the outside world from the private subnet. I suspect there's something wrong with my understanding of firewalld works when there's only one PHY (eth0), but ... I'm stuck. So,
a) is my base assumption that I should be using firewalld instead of iptables correct?
b) if so, how do I get NAT working with it on a single interface?
Thanks!
amazon-ec2 nat firewalld
asked May 27 at 6:05
philolegeinphilolegein
134
add a comment |
Short question:
I'm trying to configure my own NAT instance on AWS, starting with a standard AWS Linux 2 instance, and it seems the new "right" way to configure things is with firewalld instead of iptables, so I'm looking for the equivalent to the answer to this question, but with firewalld.
Longer description:
I'm 99% sure I have my VPC, subnets, and routing tables configured correctly. On the ec2 instance, I've enabled IP4 forwarding, disabled ICMP forwarding, and disabled source/destination check.
I believe the only step I'm missing is that the old, community NAT Instance AMIs run a script on startup that does this:
(iptables -t nat -C POSTROUTING -o eth0 -s $VPC_CIDR_RANGE -j MASQUERADE 2> /dev/null ||
iptables -t nat -A POSTROUTING -o eth0 -s $VPC_CIDR_RANGE -j MASQUERADE ) ||
die
Based on this how-to, I'm attempting to replicate the same functionality with firewalld, and I've done
firewall-cmd --zone=internal --add-source=10.0.4.0/22
firewall-cmd --zone=external --add-interface=eth0
firewall-cmd --direct --passthrough ipv4 -t nat -I POSTROUTING -o eth0 -j MASQUERADE -s 10.0.4.0/22
I've also attempted to allow ping for testing purposes, with
firewall-cmd --permanent --direct --add-rule ipv4 filter INPUT 0 -p icmp -s 0.0.0.0/0 -d 0.0.0.0/0 -j ACCEPT
I can successfully ssh to the NAT Instance, I can ping the outside world from it, and I can ping it from the private subnet, but I can't ping the outside world from the private subnet. I suspect there's something wrong with my understanding of firewalld works when there's only one PHY (eth0), but ... I'm stuck. So,
a) is my base assumption that I should be using firewalld instead of iptables correct?
b) if so, how do I get NAT working with it on a single interface?
Thanks!
amazon-ec2 nat firewalld
asked May 27 at 6:05
philolegeinphilolegein
134
serverfault.com/a/939478/126632
– Michael Hampton♦
May 27 at 6:29
a) cool. But b) those instructions say "You also need to assign the internal interface to a different zone other thanpublic. But there's only one interface. Do I assign it to "internal"?
– philolegein
May 27 at 7:01
1
Having a zone defined from a source ought to be OK, but you really should have two interfaces, one on a separate private network. Otherwise nothing prevents all your other instances from accessing the Internet directly.
– Michael Hampton♦
May 27 at 7:05
FYI, I've confirmed this works. Thanks!
– philolegein
May 27 at 13:35
add a comment |
Short question:
I'm trying to configure my own NAT instance on AWS, starting with a standard AWS Linux 2 instance, and it seems the new "right" way to configure things is with firewalld instead of iptables, so I'm looking for the equivalent to the answer to this question, but with firewalld.
Longer description:
I'm 99% sure I have my VPC, subnets, and routing tables configured correctly. On the ec2 instance, I've enabled IP4 forwarding, disabled ICMP forwarding, and disabled source/destination check.
I believe the only step I'm missing is that the old, community NAT Instance AMIs run a script on startup that does this:
(iptables -t nat -C POSTROUTING -o eth0 -s $VPC_CIDR_RANGE -j MASQUERADE 2> /dev/null ||
iptables -t nat -A POSTROUTING -o eth0 -s $VPC_CIDR_RANGE -j MASQUERADE ) ||
die
Based on this how-to, I'm attempting to replicate the same functionality with firewalld, and I've done
firewall-cmd --zone=internal --add-source=10.0.4.0/22
firewall-cmd --zone=external --add-interface=eth0
firewall-cmd --direct --passthrough ipv4 -t nat -I POSTROUTING -o eth0 -j MASQUERADE -s 10.0.4.0/22
I've also attempted to allow ping for testing purposes, with
firewall-cmd --permanent --direct --add-rule ipv4 filter INPUT 0 -p icmp -s 0.0.0.0/0 -d 0.0.0.0/0 -j ACCEPT
I can successfully ssh to the NAT Instance, I can ping the outside world from it, and I can ping it from the private subnet, but I can't ping the outside world from the private subnet. I suspect there's something wrong with my understanding of firewalld works when there's only one PHY (eth0), but ... I'm stuck. So,
a) is my base assumption that I should be using firewalld instead of iptables correct?
b) if so, how do I get NAT working with it on a single interface?
Thanks!
amazon-ec2 nat firewalld
asked May 27 at 6:05
philolegeinphilolegein
134
Short question:
I'm trying to configure my own NAT instance on AWS, starting with a standard AWS Linux 2 instance, and it seems the new "right" way to configure things is with firewalld instead of iptables, so I'm looking for the equivalent to the answer to this question, but with firewalld.
Longer description:
I'm 99% sure I have my VPC, subnets, and routing tables configured correctly. On the ec2 instance, I've enabled IP4 forwarding, disabled ICMP forwarding, and disabled source/destination check.
I believe the only step I'm missing is that the old, community NAT Instance AMIs run a script on startup that does this:
(iptables -t nat -C POSTROUTING -o eth0 -s $VPC_CIDR_RANGE -j MASQUERADE 2> /dev/null ||
iptables -t nat -A POSTROUTING -o eth0 -s $VPC_CIDR_RANGE -j MASQUERADE ) ||
die
Based on this how-to, I'm attempting to replicate the same functionality with firewalld, and I've done
firewall-cmd --zone=internal --add-source=10.0.4.0/22
firewall-cmd --zone=external --add-interface=eth0
firewall-cmd --direct --passthrough ipv4 -t nat -I POSTROUTING -o eth0 -j MASQUERADE -s 10.0.4.0/22
I've also attempted to allow ping for testing purposes, with
firewall-cmd --permanent --direct --add-rule ipv4 filter INPUT 0 -p icmp -s 0.0.0.0/0 -d 0.0.0.0/0 -j ACCEPT
I can successfully ssh to the NAT Instance, I can ping the outside world from it, and I can ping it from the private subnet, but I can't ping the outside world from the private subnet. I suspect there's something wrong with my understanding of firewalld works when there's only one PHY (eth0), but ... I'm stuck. So,
a) is my base assumption that I should be using firewalld instead of iptables correct?
b) if so, how do I get NAT working with it on a single interface?
Thanks!
amazon-ec2 nat firewalld
amazon-ec2 nat firewalld
asked May 27 at 6:05
philolegeinphilolegein
134
asked May 27 at 6:05
philolegeinphilolegein
134
asked May 27 at 6:05
philolegeinphilolegein
134
asked May 27 at 6:05
philolegeinphilolegein
134
asked May 27 at 6:05
philolegeinphilolegein
134
134
serverfault.com/a/939478/126632
– Michael Hampton♦
May 27 at 6:29
a) cool. But b) those instructions say "You also need to assign the internal interface to a different zone other thanpublic. But there's only one interface. Do I assign it to "internal"?
– philolegein
May 27 at 7:01
1
Having a zone defined from a source ought to be OK, but you really should have two interfaces, one on a separate private network. Otherwise nothing prevents all your other instances from accessing the Internet directly.
– Michael Hampton♦
May 27 at 7:05
FYI, I've confirmed this works. Thanks!
– philolegein
May 27 at 13:35
add a comment |
serverfault.com/a/939478/126632
– Michael Hampton♦
May 27 at 6:29
a) cool. But b) those instructions say "You also need to assign the internal interface to a different zone other thanpublic. But there's only one interface. Do I assign it to "internal"?
– philolegein
May 27 at 7:01
1
Having a zone defined from a source ought to be OK, but you really should have two interfaces, one on a separate private network. Otherwise nothing prevents all your other instances from accessing the Internet directly.
– Michael Hampton♦
May 27 at 7:05
FYI, I've confirmed this works. Thanks!
– philolegein
May 27 at 13:35
serverfault.com/a/939478/126632
– Michael Hampton♦
May 27 at 6:29
serverfault.com/a/939478/126632
– Michael Hampton♦
May 27 at 6:29
a) cool. But b) those instructions say "You also need to assign the internal interface to a different zone other than
public. But there's only one interface. Do I assign it to "internal"?– philolegein
May 27 at 7:01
a) cool. But b) those instructions say "You also need to assign the internal interface to a different zone other than
public. But there's only one interface. Do I assign it to "internal"?– philolegein
May 27 at 7:01
1
1
Having a zone defined from a source ought to be OK, but you really should have two interfaces, one on a separate private network. Otherwise nothing prevents all your other instances from accessing the Internet directly.
– Michael Hampton♦
May 27 at 7:05
Having a zone defined from a source ought to be OK, but you really should have two interfaces, one on a separate private network. Otherwise nothing prevents all your other instances from accessing the Internet directly.
– Michael Hampton♦
May 27 at 7:05
FYI, I've confirmed this works. Thanks!
– philolegein
May 27 at 13:35
FYI, I've confirmed this works. Thanks!
– philolegein
May 27 at 13:35
add a comment |
1 Answer
1
active
oldest
votes
On EC2 you need, besides proper iptable/nftable setup, to make sure that source destination checks are disabled on EC2 level.
https://docs.aws.amazon.com/vpc/latest/userguide/VPC_NAT_Instance.html#EIP_Disable_SrcDestCheck
answered May 27 at 7:15
harguthargut
1,80717
add a comment |
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On EC2 you need, besides proper iptable/nftable setup, to make sure that source destination checks are disabled on EC2 level.
https://docs.aws.amazon.com/vpc/latest/userguide/VPC_NAT_Instance.html#EIP_Disable_SrcDestCheck
answered May 27 at 7:15
harguthargut
1,80717
add a comment |
On EC2 you need, besides proper iptable/nftable setup, to make sure that source destination checks are disabled on EC2 level.
https://docs.aws.amazon.com/vpc/latest/userguide/VPC_NAT_Instance.html#EIP_Disable_SrcDestCheck
answered May 27 at 7:15
harguthargut
1,80717
add a comment |
On EC2 you need, besides proper iptable/nftable setup, to make sure that source destination checks are disabled on EC2 level.
https://docs.aws.amazon.com/vpc/latest/userguide/VPC_NAT_Instance.html#EIP_Disable_SrcDestCheck
answered May 27 at 7:15
harguthargut
1,80717
On EC2 you need, besides proper iptable/nftable setup, to make sure that source destination checks are disabled on EC2 level.
https://docs.aws.amazon.com/vpc/latest/userguide/VPC_NAT_Instance.html#EIP_Disable_SrcDestCheck
answered May 27 at 7:15
harguthargut
1,80717
answered May 27 at 7:15
harguthargut
1,80717
answered May 27 at 7:15
harguthargut
1,80717
answered May 27 at 7:15
harguthargut
1,80717
1,80717
add a comment |
add a comment |
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serverfault.com/a/939478/126632
– Michael Hampton♦
May 27 at 6:29
a) cool. But b) those instructions say "You also need to assign the internal interface to a different zone other than
public. But there's only one interface. Do I assign it to "internal"?– philolegein
May 27 at 7:01
1
Having a zone defined from a source ought to be OK, but you really should have two interfaces, one on a separate private network. Otherwise nothing prevents all your other instances from accessing the Internet directly.
– Michael Hampton♦
May 27 at 7:05
FYI, I've confirmed this works. Thanks!
– philolegein
May 27 at 13:35