Wireguard packet loss

Much more information may be found in the technical whitepaper. Any secure protocol require some state to be kept, so there is an initial very simple handshake that establishes symmetric keys to be used for data transfer. This handshake occurs every few minutes, in order to provide rotating keys for perfect forward secrecy.


It is done based on time, and not based on the contents of prior packets, because it is designed to deal gracefully with packet loss. There is a clever pulse mechanism to ensure that the latest keys and handshakes are up to date, renegotiating when needed, by automatically detecting when handshakes are out of date. It uses a separate packet queue per host, so that it can minimize packet loss during handshakes while providing steady performance for all clients.

In other words, you bring the device up, and everything else is handled for you automatically. You don't need to worry about asking it to reconnect or disconnect or reinitialize, or anything of that nature.

After a handshake is completed, with a message from initiator to responder and then responder back to initiator, the initiator may then send encrypted session packets, but the responder cannot. The responder must wait to use the new session until it has recieved one encrypted session packet from the initiator, in order to provide key confirmation.

Thus, until the responder receives that first packet using the newly established session, it must either queue up packets to be sent later, or use the previous session, if one exists and is valid. Therefore, after the initiator receives the response from the responder, if it has no data packets immediately queued up to send, it should send en empty packet, so as to provide this confirmation.

Very high (80-90%) packet loss on wireguard VPN

All packets are sent over UDP. If an additional layer of symmetric-key crypto is required for, say, post-quantum resistanceWireGuard also supports an optional pre-shared key that is mixed into the public key cryptography.

wireguard packet loss

When pre-shared key mode is not in use, the pre-shared key value used below is assumed to be an all-zero string of bytes. When the responder receives this message, he decrypts and does all the above operations in reverse, so that the state is identical.

The responder sends this message, after processing the first message above and applying the same operations to arrive at an identical state:. When the initiator receives this message, he decrypts and does all the above operations in reverse, so that the state is identical. After the above two messages have been exchanged, keys are calculated by the initiator and responder for sending and receiving data:. We require authentication in the first handshake message sent because it does not require allocating any state on the server for potentially unauthentic messages.

In fact, the server does not even respond at all to an unauthorized client; it is silent and invisible. The handshake avoids a denial of service vulnerability created by allowing any state to be created in response to packets that have not yet been authenticated.

This, however, introduces the issue of having authentication in the first packet: it is always open to a replay attack. An attacker could replay initial handshake messages to trick the server into regenerating its ephemeral key, thereby disconnecting the legitimate client connection though not affecting the security of any messages.

For that reason, we include a TAI64N timestamp in the first message. The server keeps track of the greatest timestamp received per client and discards packets containing timestamps less than or equal to it. If the server restarts and loses this state, that is not a problem: an initial packet from earlier can be replayed, but it could not possibly disrupt any ongoing sessions, since the server has just restarted. Once clients reconnect to the server after its restart, they will be using greater timestamps, invalidating the previous ones.

This timestamp ensures that an attacker can't disrupt a current session between client and server. In order to fend off a CPU-exhaustion attack, if the server is under load, it may choose to not process handshake messages, but instead respond with a cookie reply packet.

In order for the server to remain silent unless it receives a valid packet, while under load, all messages are required to have a MAC that combines the receiver's public key and optionally the PSK as the MAC key.

When the server is under load, it will only accept packets that additionally have a second MAC of the prior bytes of the message that utilize the cookie as the MAC key. We therefore compute msg. This allows for proof of IP ownership, which can then be rate limited properly. The server, after computing these MACs as well and comparing them to the supersport 4 football schedule received in the message, must reject messages with an invalid msg.

As mentioned above, when a message with a valid msg. Nonces are never reused. A 64bit counter is used, and cannot be wound backward. UDP, however, sometimes delivers messages out of order.Packet Loss Unfortunately not all networks are perfect. This is especially true for the RealWorldand that means that sometimes packets sent by the network will never arrive at the proper destination.

Even worse, sometimes packets will be reordered by the network, or even duplicated by the network. This is no biggie for network protocols however since it is all based on "Duh, the network is supposed to be lossy. Deal with it or suffer".

wireguard packet loss

In some situations when Packet Loss occurs there can be a significant performance degradation and thus it might be interesting to us to try to minimize the amount of packetloss occuring.

Which is easy once one has figured out WHY the packets are being lost, and where they are lost The art of determining this information is often seen as BlackMagic ConnectionOrientedProtocols such as TCP will detect a packet loss, and try to Retransmit the packet data.

ConnectionlessProtocols such as UDP won't detect a packet loss, the data in that packet will simply be lost. Protocols above UDP would be the ones whose implementations detect packet loss and retransmit packets. Reasons For most networks, packet loss is a typical behaviour, e.

How to Use the Linux Traffic Control

Troubleshooting If the network is configured correctly, there's not much that can be done against packet loss as this is a somewhat "intended" behaviour. For TCP based protocols this is often reasonably easy to detect and analysis of PacketLossPattern s can often give a hint of what is causing the problem.

Common reasons are DuplexMismatch es or Congestion. Great resources on Congestion can be found by googling for Sally Floyd. PacketLoss last edited by localhost. See the License page for details. Powered by MoinMoin and Python. Please don't pee in the pool.As mentioned in my post about using nsupdate and bind to set up dynamic DNSI have a home server which I use to store several things. I then use an nginx-proxy from my main server to reach these things. The problem with using a dynamic DNS to reach the server, is that I need to restart nginx every time the address changes.

My plan here is to set up a VPN between these machines, so that I can reach my home server from my main server using a static address. To achieve this, my home server will connect to my main server using WireGuard. This post is mainly written so I can remember what I did in the future. Going forward my home server will be the clientand my main server will be the server.

Wireguard provides a PPA for Ubuntu, and is quite easy to install. Just run the following commands on both server and client. The addresses are just randomly chosen private addresses. Please note that the PublicKey under [Peer] should be the clients public key. I have decided to comment out the SaveConfig -option. This option will save any changes you make to the live VPN-connection using wg to the config-file.

This is nice if you actually make changes live. I prefer to update config-files. So, I wish to route all my IPv6 packets through the server. And, lastly, let us try to ping google with IPv6, to see if my client can reach the world using Ipv6.Jim Aragon 7. Hello Jim, When you said : then you could display that number in a custom column and manually look for missing numbers.

Can you explain to me how can I do or where in Wireshark? Thanks for all the answers!

Installing and Configuring WireGuard® on Linux as a VPN server

First, there must be a dissector for the higher-level protocol so that Wireshark puts the unique number into its own field. If so, in the Packet Details pane, right-click on the field you want to use and select "Apply as Column. Which is unfortunate. It would be nice if [t Wire]shark supported being able to display the hex bytes from a display filter expression such as "frame[n:m]". If it did, then you wouldn't necessarily need to have a higher-level protocol with a registered field.

What is WireGuard protocol?

Well, in the absence of a higher-level protocol and the above feature, it may also be possible to achieve this with Luaalthough I have no experience with it so I can't offer much help there.

Short answer: You don't. There's an easier way; merge 2 packet captures together in Wireshark, if you looking for dropped UDP packets say between 2 routers for example. There may be a way if there's nothing in a higher protocol for you to use, but it's fairly implementation specific.

When I was developing a new piece of network hardware, I noticed that Linux sends out all IP packets with an incrementing identification field in their header, so if you're capturing packets that have been sent out by Linux then you've got a chance. I'm not sure how the Windows or Unix Stacks handle the ident field and not every version of Linux uses the standard stack, so you'll need to check to see if this is happening first.

Another down side to this is it's the protocol below UDP that's giving you this trackable sequence, which means that even if you suspect a packet has been dropped, there's no way to know whether it was UDP or another protocol. I should also mention that if the NIC is using a hardware TSO then the Ident field might not be entirely predictable even with Linux, some TSO engines don't bother to update it as most network stacks ignore this field.

The Identity field in the IP header does indeed increase monotonously. However, it does so for all connections. So yes, if the linux box is not sending out other IP traffic watching the ip. But if you miss a particular value for the ip. Also, there are some stack implementations that do not increase the IP ID, but use a value of 0 unless fragmentation happens OpenBSD, for security reasons. Well, if the protocol running atop UDP is "predictable", with every request packet resulting in a fixed number of response packets or vice versathen you might be able to count the total number of requests and compare it to the total number of responses.

If the values don't correlate, then you can reasonably conclude that some packet loss occurred.They provide 1 Ethernet jack per person per room. I have multiple wired devices, so at the very least I needed a switch, but I also wanted all the devices to be able to talk to everything back on my home network.

wireguard packet loss

The best way to do this is with a site to site VPN. This lets devices on each end of the VPN tunnel communicate with each other as if they were directly on the same network. Originally I was going to use a Cisco Meraki MX64 firewall get one for free here at my dorm as my router, but the functionality is somewhat limited for my uses and I prefer the EdgeRouters, so I got a cheap EdgeRouter X off of eBay college budget life and went to work.

wireguard packet loss

Both EdgeRouters have hardware offloading for the encryption used in typical IPSEC configurations, so this seemed like a good high performance option. Finally, Plan C was to use WireGuard. The details on how to set it up in on my hardware though were somewhat lacking, and it took quite a few hours to get it actually functional. Find the download URL for your router and copy and paste it on line 3.

Generate public and private keys on each router. Copy and paste the output into a text file for convenience. Top line of output is the private key, the bottom line is the public key. Configure the home router. I used Set up the other router peer on each router. Skip line 2 on the side with port forwarding only useful on the side that can reach out to the other side with port forwardingor run it on both sides if there is. Must be run on at least one side. Edit the ruleset configuration and add a new rule.

You should also see a new wg0 interface in the dashboard, possibly with traffic going over it already. This is so that your routers know about the networks on the other end and can direct traffic accordingly. This should do the trick, on each end type this with the relevant info:.

Try pinging a device on the other end, from either end. If it comes back with a response, you should be all done! Assuming all went well, that should be it. Hi thanks for the tutorial! Everything is working for me bar the final step… pinging!! I lose all internet access once I start wireguard on the client!

Hi, it sounds to me like you have some routing set up on the client side so that everything goes over the wireguard tunnel. Can you ping from the client to the server? Thanks for your comment! I firsy try to use allowed-ips I have to manually add static router in both routers left site: ip route add Hi there. I believe putting the 99 in there is upsetting it. The is upsetting it there. I think if you put in Your email address will not be published.This guy is looking at pictures of my wife, probably.

I sync photos of my friends and family to Amazon Photos, blast my private data off to Microsoft OneDrive, give my passwords to 1password, and trust my web hosting provider not to run away with my data. Amazon Photos, for example, has started using machine learning to identify the people in my photos. I want the bits and bytes that describe the intimate details of my life to live around under my own roof and only escape to the Internet with my permission.

Also, my Internet service provider does not explicitly allow server hosting, so excess incoming Internet traffic might get me in trouble. The solution comes in the form of an Internet-facing server with a static IP.

That server will receive requests and forward them to the LAN server through an encrypted, performant WireGuard tunnel:.

I chose WireGuard over other VPN candidates because of the simplicity of configuration and low server overhead. When choosing a server provider for your Internet-facing server, make sure to choose one with low latency to your home network, since that latency will be added to every request you make.

If the provider has test servers listed on their website, you can ping them from your home network to make an estimate of the round-trip-time that will be added to each request. This will be the only real expense of this project. I installed CentOS on my Internet-facing server, but WireGuard is compatible with a wide variety of operating systems. Your Internet-facing server is now set up to act as a WireGuard host. At this point, you should be able to do ping With both of these methods, keep in mind that the IP of the original client will be obscured by the reverse proxy.

Now you can start moving all of the services you want to self-host under your own roof! In future articles, I will discuss setting up your own self-hosted photo storage, continuous integration pipelines, web hosting, and others. You can use the VPN to access it instead. The official WireGuard distribution comes as a kernel mod.Hi All, This has been an ongoing problem for me for a few weeks and i've been really pulling my hair out.

We have an issue with packets of data from our LAN to our router being dropped by what i suspect is one of our switches. Some examples of things upgraded include moving the phone system and camera system over to IP meaning the need for an additional switch.

We now have 3 x port switches in the rack the CCTV system has it's own PoE switch in the back and isolates the cameras on their own LAN which are daisychained together via one of their ethernet ports and are pretty much all completely full. Whilst none of the devices connected up should be using too much data is this overkill? I have just ordered a ubiquiti USW to try and consolidate our switches but if that doesn't fix it i'm unsure what to do other than start unplugging things one at a time to see if a device on the network could be causing the issue?

I'm unsure whether this is the right path to go down so was wondering what you Spiceheads think. I would treat it as a broadcast storm even though it may not be. Start isolating switches and disconnecting equipment until you stop dropping packets.

You should see ping return times of 1ms on your LAN and never drop a packet anything higher then that and there is an issue with a switch, device or your over saturating the connection. When I logged into the router I could see IP allocation table that listed all devices and the IP addresses that I'm assuming have been allocated.

I could even see my personal computer that was connected to Wifi. Yes, call them! When I replaced a switch at home I had to call them to reset the MAC table for the new switch before everything started working. This would be why the phones are still good and when the old ones are added back in it would work. I'll bet if you connect the new hub through one of the old ones it will work because the old MAC registration is programmed into the modem. I'm guessing if you did not restart the devices they still have the old ARP table and wont know about the new switch.

It could be a multitude of things causing this issue. If you can get a netscout linkrunner or another fluke and test all of the drops that are experiencing this problem. If the netgear is new you could wait until after hrs and pull it to see if it is causung the issue. You could set up vlans and isolate your devices on different networks and see if the issue occurs on all networks. You could take your laptop unplug everything except for switch to router and plug the lappy in at every drop and see if you get the loss from every location.

If you don't you could add one device at a time to try to isolate it. You could log into the switches and look for errors on each port.

You could be having collisions do to a bad nic in a device If it where me, is it a managed switch? In that case you may be able to check the logs or use other diagnostic tools to find the reason for the dropped packets. That's what I would do. Check interface stats on your router. Check Interface utilization. Is your router routing point between some vlan's? Why - it is developed with same vendor standards. Each vendor makes its own deployments and ensures maximum compatibility to it own models.

We spent a ton of time trying to set redundant 10G link between Cisco and Netgear. That was such a waste of time.