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New Member

Certain websites over MPLS

We currently connect our remote sites over an ISP's hosted MPLS network. Occasionally we run into a website not working and all signs point to the MPLS network. I've seen this problem before with IPSEC VPN tunnels but not across the MPLS connections. Has anyone experienced similar issues?

2 REPLIES
New Member

Re: Certain websites over MPLS

Yes, definitely if your provider has links with mtu's say set to 1500. The mpls label is 4 byte's causing websites that set the do not fragment bit to be dropped while traversing those links. This would cause some sites to work and some not.

Thanks

New Member

Re: Certain websites over MPLS

Hi

You would experience MTU issue more in case of IPSEC VPN since it carries more overhead compare to MPLS VPN. IPSEC overhead is 46bytes while MPLS is 4bytes.

Also requires your ISP to set higher mtu > 1500 size across the path.

Thanks

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