topic Bandwidth Requirement for VPN in SASE and Remote Access

Bandwidth Requirement for VPN

Fabz — Wed, 11 Oct 2023 15:53:54 GMT

Hi Checkmates,

i have an issue with one of a staff who working from the mining site (limited internet connextion) when trying to connect VPN to HQ. RAVPN connection is not stable,

Just checking the guide but im not find anything related to the minimum and recommendation BW requirement for VPN.

Had checking with ISP team who created the satelite connection, the want to know the jitter and latency as well to have stable connection to the VPN.

Does anyone has the infromation or docs about that? Thankyou!

Re: Bandwidth Requirement for VPN

PhoneBoy — Wed, 11 Oct 2023 17:19:47 GMT

The answer to the question depends entirely on the applications being used.
IPsec itself adds latency and packet overhead, depending on the configuration.
You can assume at least 10% packet overhead for IPsec, though as the IPsec overhead calculator from Cisco shows, it varies based on your actual configuration.
Exact latency will depend on your configuration settings.

Re: Bandwidth Requirement for VPN

the_rock — Wed, 11 Oct 2023 17:24:28 GMT

I agree with Phoneboy, it definitely depends on multiple factors.

Andy

Re: Bandwidth Requirement for VPN

Fabz — Thu, 12 Oct 2023 05:06:18 GMT

could you help to list the multiple factors? will use it for internal discussion with isp team

Re: Bandwidth Requirement for VPN

Fabz — Thu, 12 Oct 2023 05:10:47 GMT

configuration settings is more like in CP VPN?

so from CP admin guide, there is no information?

Re: Bandwidth Requirement for VPN

the_rock — Thu, 12 Oct 2023 10:27:24 GMT

Things like enc methods used, amount of traffic, etc

https://www.zenarmor.com/docs/network-security-tutorials/what-causes-vpn-to-be-slow

Re: Bandwidth Requirement for VPN

PhoneBoy — Thu, 12 Oct 2023 15:52:24 GMT

It's the applications you use over the VPN that determines the bandwidth requirements.
VPN adds packet overhead and latency that you will have to account for.
MTU/Fragmentation issues can sometimes occur when traffic traverses a VPN.