[AusNOG] Packet loss on link - multiple providers

[Peter Tiggerdine]

Fairly standard for the world of vpns.

Given you have no echo  or reply at the azure gateway I'm guessing icmp
codes for negotiating mtu probably don't exist either.

Lower the mtu om the vpn add see if the problem changes.

Regards,

Peter Tiggerdine



On Fri, Aug 3, 2018, 12:18 Daniel Bartlett <dan at thecloudmode.com> wrote:

> Hi All,
>
>
>
> We have a customer that is experiencing packet loss on a VPN connection.
>
> The connection is between their on-prem (colo datacentre) and Azure.
>
> Their firewall is managed by Vendor A (customer owned device).
>
> The ISP is Vendor B.
>
>
>
> We have been getting bounced around between Microsoft support, Vendor A
> (FW Support), Fortinet (FW Vendor support) and Vendor B (ISP) – all
> claiming no fault.
>
> Our monitoring (from on-prem servers to Azure servers) shows consistent
> packet loss of 2-3% - peaking at 8-9% between Azure and on-prem.
>
>
>
> Packet captures run end-to-end show the loss to be occurring between the
> on-prem FW and the Azure VPN GW.
>
>
>
> We are having a hard time convincing the ISP of the issue – they have been
> unable to find any fault in their network.
>
> The ISP support is finding it hard to troubleshoot being that the Azure
> VPN GW does not respond to ping (by design – and we cannot change this).
>
>
>
> Monitoring in place on the same link to internet site (google.com) shows
> 0% packet loss. We are only loosing packets on the VPN.
>
>
>
> Just putting this out there for any suggestions on how we can assist the
> ISP to determine the root cause? Or for any other suggestions?
>
>
>
> Thanks
>
> Dan
>
>
>
> *Daniel Bartlett* / Technology Architect
> dan at thecloudmode.com / 0407 176 755
>
> Lvl 17 / 31 Queen St
> Melbourne Victoria Australia 3000
> www.thecloudmode.com
>
>
>
> _______________________________________________
> AusNOG mailing list
> AusNOG at lists.ausnog.net
> http://lists.ausnog.net/mailman/listinfo/ausnog
>
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