All Questions
Tagged with amazon-vpc iptables
13
questions
0
votes
1
answer
535
views
Creating Subnet IP address : IPv4 block sizes must be between a /16 netmask and /28 netmask
I'm new to AWS and I'm looking to create a subnet. Whenever I try the defaults subnets under I get either the error message "IPv4 block sizes must be between a /16 netmask and /28 netmask." ...
3
votes
1
answer
1k
views
Do AWS Security Groups and rules and Network ACLs REJECT or DROP traffic?
AWS Security groups and AWS VPC Network ACLs are 2 solutions for controlling traffic in VPCs.
When rules in either deny an IP packet, do they REJECT or DROP (in the iptables sense)?
That is: are ...
- 313
1
vote
3
answers
4k
views
Public and private subnet in VPC
IANA established certain blocks of IP as private IP range(shown below)
10.0.0.0 – 10.255.255.255 (255.0.0.0)
172.16.0.0 – 172.31.255.255 (255.255.0.0)
192.168.0.0 – 192.168.255.255 (...
- 121
2
votes
1
answer
454
views
NAT setup on AWS
This might sound ridiculous for some, but am trying to setup NAT on lightsail so that I can access my private ec2 instances which are connected using VPC peering.
Suppose if 172.31.x.x is my ...
- 21
1
vote
1
answer
3k
views
Instance in private subnet can connect internet but can't ping/traceroute
I have an AWS VPC with some public subnets and a private subnet, like the image below.
Both instances can connect to the internet (INSTANCE A connects through NAT GATEWAY instance)
NAT GATEWAY can ...
- 327
1
vote
1
answer
283
views
Unable to connect to a member server within a vpn network or vice versa, but why?
I've created a test VPC in AWS for an OpenVPN proof of concept.
In this VPC I've lunched a linux member server and an OpenVPN server AMI from AWS Marketplace, installed it and configured it.
As a ...
- 10.9k
1
vote
0
answers
403
views
Unable to connect to web server hosted in private subnet of VPC via NAT hosted in public subnet
I have hosted my android/web application on a EC2 instance in the private subnet (10.0.1.0) of my VPC. This instance has apache-tomcat installed on it, but does not have a public IP.
I also have a ...
- 11
3
votes
1
answer
3k
views
Port 53 in Amazon Security Group
Everything works as expected. This question is for learning purposes only.
Using Amazon Security Groups in a VPC. Outbound rules are:
0.0.0.0/0 Port 80
0.0.0.0/0 Port 443
Iptables allows OUTPUT ...
- 1,605
10
votes
4
answers
16k
views
AWS VPC + IPtables + NAT: Port Forwarding is not working
Yesterday, I posted a question here but I think was not clear enough in my words. BTW, This question is not a duplicate.
I have AWS VPC Setup as below.
GOAL/PROBLEM: SSH to Server A from internet. ...
- 504
4
votes
2
answers
16k
views
port forwarding through AWS VPC NAT
Yes, I have already scoured the internet and read most of the popular IPTables / DNAT guides / pages / posts.
My Problem
Summary
I have a VPC with several subnets. One subnet in particular requires ...
- 43
12
votes
2
answers
17k
views
How to persist iptables configuration on Amazon EC2 VPC NAT Ami? [duplicate]
I have a small script like this to configure the iptables:
#!/bin/bash
PRE_STR="iptables -t nat -A PREROUTING -p tcp -j DNAT"
FOR_STR="iptables -A FORWARD -p tcp -j ACCEPT"
#########################...
- 223
3
votes
2
answers
4k
views
VPC SSH port forward into private subnet
Ok, so I've been racking my brain for DAYS on this dilema. I have a VPC setup with a public subnet, and a private subnet. The NAT is in place of course. I can connect from SSH into a instance in the ...
- 189
0
votes
1
answer
2k
views
iptables redirect UDP packet to multiple destinations [duplicate]
Possible Duplicate:
How to Tee udp packets onto a different host
I'm running some instances in Amazon's Virtual Private Cloud. One instance is inside a VPN only subnet (10.128.1.0/24) connected ...
- 151