Contents
How is SNAT different than NAT?
SNAT changes the private IP address of the source host to public IP address. It may also change the source port in the TCP/UDP headers. Destination NAT changes the destination address in IP header of a packet. It may also change the destination port in the TCP/UDP headers.
What is the difference between source NAT Destination NAT and masquerading?
The typical usage of this is to redirect incoming packets with a destination of a public address/port to a private IP address/port inside your network. Masquerading is a special form of Source NAT where the source address is unknown at the time the rule is added to the tables in the kernel.
What is masquerade used for?
Masquerade NAT allows you to translate multiple IP addresses to another single IP address. You can use masquerade NAT to hide one or more IP addresses on your internal network behind an IP address that you want to make public.
What is the purpose of SNAT?
A SNAT can be used by itself to pass traffic that is not destined for a virtual server. For example, you can use a SNAT object to pass certain traffic (such as DNS requests) from an internal network to an external network where your DNS server resides.
Why do we need Destination NAT?
Destination NAT translates the destination addresses and ports of packets. Source NAT translates private IP addresses into public IP addresses so that users on an intranet can use public IP addresses to access the Internet.
What is the use of IP masquerade how it is implemented?
IP masquerading is a process where one computer acts as an IP gateway for a network. All computers on the network send their IP packets through the gateway, which replaces the source IP address with its own address and then forwards it to the internet.
Which is faster, SNAT or masquerade and why?
MASQUERADE does NOT require –to-source as it was made to work with dynamically assigned IP addresses. SNAT works with static IP addresses. MASQUERADE has extra overhead and is slower than SNAT because each time the MASQUERADE target gets hit by a packet, it has to check for the IP address to use.
Do you need–to-Source NAT in Masquerade?
Both targets do source NAT (or SNAT) in the POSTROUTING chain in the nat table. MASQUERADE does NOT require –to-source as it was made to work with dynamically assigned IP addresses. SNAT works with static IP addresses.
When to use Masq or Snat in a firewall?
If your outgoing interface has a address that is static, then you don’t need to use MASQ and can use SNAT which will be a little faster since it doesn’t need to figure out what the external IP is every time. Thanks for contributing an answer to Server Fault!
Is it possible to use Masquerade with static IP?
SNAT works with static IP addresses. MASQUERADE has extra overhead and is slower than SNAT because each time the MASQUERADE target gets hit by a packet, it has to check for the IP address to use. IMPORTANT: It is still possible to use MASQUERADE target with static IP.