Recent high latency to my vpn provider that uses azure nodes.

MK 20 Reputation points
2023-02-26T19:01:39.5466667+00:00

Hello, I started having issues recently with network latency to certain applications that I believe specifically use azure services. For instance my VPN has increased its latency by approximately +20-40ms on all azure nodes. Attached below displays the RTT which is the latency.

User's image

Which is very weird because when I look at other nodes that are hosted in Amsterdam by other cloud providers I get a lot less latency. Attached below.User's image

So the obvious solution would be to use another node to connect directly. However, the main problem is I use my VPN to reduce my latency (yes it works because it gives a better route to the servers than my isp) in a video game which also happens to be hosted on azure. So previously I used to get approximately 50ms to the game servers hosted on azure and now I am at to 90ms on a good day and 120+ on a bad day. I called my isp and they said the issue was not on their side and refused to help any further.

So I ran a traceroute and I am not sure how to proceed any further to fix my issue. Please note that the latency never used be this high. Thank you.

Tracing route to 52.236.155.161 over a maximum of 30 hops

  1    <1 ms    <1 ms    <1 ms  192.168.3.1
  2     1 ms    <1 ms    <1 ms  192.168.100.1
  3     9 ms     9 ms     9 ms  196.70.144.1
  4     8 ms     8 ms     9 ms  adsl-118-85-192-81.adsl2.iam.net.ma [81.192.85.118]
  5     9 ms     8 ms     8 ms  adsl-121-85-192-81.adsl2.iam.net.ma [81.192.85.121]
  6     8 ms     8 ms    16 ms  105.73.30.248
  7    11 ms    10 ms    10 ms  inwi.ier02.rba30.ntwk.msn.net [104.44.196.73]
  8    11 ms    11 ms    11 ms  ae20-0.ier01.rba30.ntwk.msn.net [104.44.40.175]
  9    67 ms    67 ms    67 ms  ae22-0.ear01.bio70.ntwk.msn.net [104.44.42.125]
 10    86 ms    86 ms    86 ms  be-20-0.ibr01.bio70.ntwk.msn.net [104.44.22.107]
 11    85 ms    85 ms    85 ms  be-7-0.ibr01.par30.ntwk.msn.net [104.44.29.152]
 12    85 ms    85 ms    85 ms  be-9-0.ibr02.pnq01.ntwk.msn.net [104.44.16.145]
 13    93 ms    86 ms    84 ms  ae102-0.icr02.ams30.ntwk.msn.net [104.44.22.216]
 14     *        *        *     Request timed out.
 15     *        *        *     Request timed out.
 16     *        *        *     Request timed out.
 17     *        *        *     Request timed out.
 18     *        *        *     Request timed out.
 19     *        *        *     Request timed out.
 20     *        *        *     Request timed out.
 21     *        *        *     Request timed out.
 22     *        *        *     Request timed out.
 23     *        *        *     Request timed out.
 24    84 ms    84 ms    84 ms  52.236.155.161

Trace complete.
Azure VPN Gateway
Azure VPN Gateway
An Azure service that enables the connection of on-premises networks to Azure through site-to-site virtual private networks.
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Azure Virtual Network
Azure Virtual Network
An Azure networking service that is used to provision private networks and optionally to connect to on-premises datacenters.
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Accepted answer
  1. risolis 8,701 Reputation points
    2023-02-26T20:12:58.93+00:00

    Hello @MK

    Thank you for posting this concern on this community space.

    I have read your case scenario description and I would like to gather or share my 2 cents here below:

    1-For instance, I have faced the same issue with latency as well. On the output, you will see that I have a P2S VPN and I found that the MTU value configured is not the standard which is 1500.

    Adapter info below:
    
    PPP adapter vnet-southcentralus-xxxxx-xxx-001:
    
       Connection-specific DNS Suffix  . :
       IPv4 Address. . . . . . . . . . . : 192.168.254.2
       Subnet Mask . . . . . . . . . . . : 255.255.255.255
       Default Gateway . . . . . . . . . :
    
    

    2-Then, you can look at the MTU value:

    User's image

    3- As per public documentation, there is a default behavior that is relevant to know which is:

    • All data packets will be fragmented at 1400 as MTU value permitted.
    • If on TCP session is observed TCP-Out-of-Orders packets sequence, Port Reused behavior and so on... Well, they will be dropped.
    • If you want to enhance or speed up your data session, you can either use an NVA (Network Virtual Appliance) or work on the MSS value on TCP sessions.
    • You can modify the MTU value along the routing path.
    • Please direct your self to the following URL: https://learn.microsoft.com/en-us/azure/virtual-network/virtual-network-tcpip-performance-tuning    
    • You can change the listening ports and among others.
    • Furthermore, review the MTU value at the OS level on your server/vm.
    • Finally, you can reset the VPN gateway and get better results with your latency concern.

    Looking forward to your feedback,

    Cheers,

    Please "Accept the answer" if the information helped you. This will help us and others in the community as well.

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