At Cronos, we believe that every single server should be protected by an enterprise firewall. To achieve this we have harnessed the power of VMware's enterprise security product: vCloud Networking and Security (VCNS).
VCNS runs directly on the hypervisors which guarantees the very best performance and throughput available. Transfer rates of up to 10Gbit are possible should that be required and will not require any resource from servers.
Click here for a comparison of performance between VCNS and hardware firewalls.
An external dedicated firewall offers many advantages over built-in software firewalling:
Comparing dedicated firewalling with built-in software firewalling
||Built-in Software Firewalling
|Hardened “made for purpose” device
||Sits alongside the OS and is subject to attack itself
|Cannot be disabled by a webserver hack/vulnerability
||Should a hacker exploit a vulnerability on the server, the firewall can simply be turned off leaving you exposed to further backdoor or remote shell exploits
|Attacks are mitigated, allowing protected servers to continue functioning as normal
||Attacks can saturate the networking stack of the server, preventing normal operations
|Offload of processor and network
||Servers may experience slowdown or denial of service if an attack is made
|Superior configuration, management and audit
||Sometimes system admins temporarily disable firewalls for debugging purposes and forget to re-enable them
|Easy to read firewall rules ensures good security
||Arcane config can lead to accidental holes
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