0
votes
1answer
123 views

Can't obtain ip-addres from my DHCP server

I can't obtain a ip-addres from my dhcp-server and it's going trough a firewall (pfsense), The firewall(pfsense) and DHCP server are two virtual machines on my physical server(ESXI). As rules i use ...
4
votes
4answers
1k views

Making iptables easier to maintain

My network is completely locked down except for a few sites which are whitelisted. This is all done through iptables, which looks something like this: # Allow traffic to google.com iptables -A ...
3
votes
6answers
2k views

How reliable are IP address-based firewall restrictions?

On some of my production systems that need to be accessible outside of the LAN I will sometimes add a firewall restriction at the edge to only permit traffic on, say, RDP from a specific origin IP ...
0
votes
2answers
129 views

Should I ever configure a host with a public IP address to accept traffic from a private IP address?

I connect the 'net with a public static IP (my router's IP address for NAT) and a /29 subnet (for machines behind the router). On my router, I have: #sh ip route | inc x.x x.x.0.0/16 is ...
1
vote
3answers
2k views

What could prevent one Amazon EC2 instance from pinging another instance's Private IP?

I have multiple Amazon EC2 instances which need to communicate using private IPs. However, so far I've been unable to ping one instance's private IP from another instance. I can ping external ...
2
votes
1answer
523 views

Grant access rights to a MySQL instance based on hostname instead of IP address?

I have a MySQL database that I would like to remotely access from Windows Azure which does not provide fixed IP addresses at this point. Instead of white-listing a very large IP range to cover the ...
3
votes
4answers
3k views

how can 192.168.2.10 talk to 172.18.156.65?

from what i understand, all computers need to be in the same subnet /24 so how would i get a computer to be able to connect to another computer that is set as 172 ? one computer is behind a firewall, ...