1. You have decided to use SNAT and PAT on your small office network. At minimum,
how many IP addresses must you obtain from your ISP for all five clients in your office
to be able to access servers on the Internet?
To determine the minimum number of IP addresses required for all five clients in your office to access servers on the Internet using SNAT and PAT, you need to consider the following:
1. SNAT (Source Network Address Translation) allows multiple devices in a private network to share a single public IP address when communicating with the Internet. This is typically used for outbound connections.
2. PAT (Port Address Translation) allows multiple devices in a private network to share a single public IP address by using unique port numbers for each communication session. This is typically used for inbound connections.
Assuming that all five clients will be accessing servers on the Internet simultaneously, each client will require a unique source port number when communicating with the servers. Therefore, when using PAT, you will need to allocate a range of unique port numbers for each client.
In this scenario, you will need a minimum of:
- 5 IP addresses for each client to have a unique source IP address when communicating with servers on the Internet using SNAT.
- A range of unique port numbers for each client when using PAT.
So, the minimum number of IP addresses you must obtain from your ISP for all five clients to access servers on the Internet would be 5.
To calculate the minimum number of IP addresses you need from your ISP, you need to consider the total number of clients and the network address translation (NAT) methods used.
SNAT (Source Network Address Translation) and PAT (Port Address Translation) both allow multiple devices to access the internet using a single public IP address.
In this case, let's assume that all five clients in your office will be using the internet simultaneously.
To accommodate all five clients to access servers on the internet, you need to reserve IP addresses for the clients and have an extra IP address for the SNAT/PAT translations.
Here's the breakdown:
- 5 IP addresses: One IP address for each client (assuming each client needs a separate IP address).
- 1 extra IP address: This IP address will be used for SNAT/PAT translation, allowing multiple clients to share the same public IP address.
Therefore, you will need a minimum of 6 IP addresses from your ISP.