Modify multicast in optical modem to less desync and hitreg

[Syykfk]

I saw a post like this in this forum, he said that the settings about IGMPv3 alleviated his desync,

I was looking at options on my router and tweaking some without improvement, until I found something called IGMP in the multicast section. For some reason, the IP linked to my internet was set to automatic. I changed it to an option called IGMPv3, and it greatly improved my online gameplay. I've been testing it for a few days now

viewtopic.php?f=10&t=13801
so I tried it,
This is my optical modem settings interface, I tried changing the options in three parts,
1, PPPoE routing WAN Proxy mode: IPoE (default: PPPoE)
2, Multicast PROXY version: V3 (default: V2)
3, All options in box 3,

Let me describe my feelings,
1, Switching between PPPoE and IPoE and passing the DW test, the default will increase my desync and cause very slow hitreg
IPoE will fix these, hitreg is very good and very fast, and the desync is slightly fixed.

2. V3 / V2（Need more testing）

3. I tried to change all the values ​​in box 3 to the maximum value, in valorant I saw enemies flashing and desync, changed them to the minimum allowed value, and the enemies no longer flashed.

Summary: I am not sure what the best value in box 3 is yet, but the minimum value is definitely much better than the maximum value.
The feeling brought by the whole adjustment is obvious to me, especially the hitreg, and it also reduced my desync, but not completely eliminated it.

屏幕截图 2025-05-12 155948.png (65.74 KiB) Viewed 5409 times

In addition, I found an article that mentioned older C++ could cause desync issues and provided a tutorial. In the comments section, some people gave positive feedback after trying it. I also tried it, and it did have a positive effect, but it wasn't very obvious.
https://www.reddit.com/r/ValorantTechSu ... input_lag/

[Syykfk]

If there are any other settings in routers and optical modems that can mitigate desync, please let me know and I will test and report back.


Anyone who has researched desync can add my WeChat: mmmmsama, we can share settings with each other. I have researched desync a lot.

[Syykfk]

When the synchronization error disappears, I can kill anyone.

屏幕截图 2025-05-13 111653.png (873.15 KiB) Viewed 5189 times

In the past two days, I have been testing MSI mode and MSI limit, and I can say with 100% certainty that GPU MSI mode causes desync and hit registration issues on my computer. As for the limit, I am still looking for the correct values.I believe that desync exists in the network/NIC/MSI mode and also comes from some settings on the computer, and there are many settings that need adjustment.

屏幕截图 2025-05-13 111749.png (14.18 KiB) Viewed 5189 times

Are there any other settings that can alleviate the sync issues? Feel free to share.

[JimCarry]

I saw a post like this in this forum, he said that the settings about IGMPv3 alleviated his desync,

I was looking at options on my router and tweaking some without improvement, until I found something called IGMP in the multicast section. For some reason, the IP linked to my internet was set to automatic. I changed it to an option called IGMPv3, and it greatly improved my online gameplay. I've been testing it for a few days now

viewtopic.php?f=10&t=13801
so I tried it,
This is my optical modem settings interface, I tried changing the options in three parts,
1, PPPoE routing WAN Proxy mode: IPoE (default: PPPoE)
2, Multicast PROXY version: V3 (default: V2)
3, All options in box 3,

Let me describe my feelings,
1, Switching between PPPoE and IPoE and passing the DW test, the default will increase my desync and cause very slow hitreg
IPoE will fix these, hitreg is very good and very fast, and the desync is slightly fixed.

2. V3 is better than V2

3. I tried to change all the values ​​in box 3 to the maximum value, in valorant I saw enemies flashing and desync, changed them to the minimum allowed value, and the enemies no longer flashed.

Summary: I am not sure what the best value in box 3 is yet, but the minimum value is definitely much better than the maximum value.
The feeling brought by the whole adjustment is obvious to me, especially the hitreg, and it also reduced my desync, but not completely eliminated it.


屏幕截图 2025-05-12 155948.png

hi

[JimCarry]

When the synchronization error disappears, I can kill anyone.
屏幕截图 2025-05-13 111653.png
In the past two days, I have been testing MSI mode and MSI limit, and I can say with 100% certainty that GPU MSI mode causes desync and hit registration issues on my computer. As for the limit, I am still looking for the correct values.I believe that desync exists in the network/NIC/MSI mode and also comes from some settings on the computer, and there are many settings that need adjustment.
屏幕截图 2025-05-13 111749.png


Are there any other settings that can alleviate the sync issues? Feel free to share.

[Syykfk]

hi i am from europe and by your screen i think i did it what do you think ?

From your screenshot, it looks like you have made the settings I mentioned. You can also try other values in here to see which one suits you better. For me, my settings are currently the most suitable for me.

i also think msi off is better for the nic if you have on board,but now i am using usb external so this is how my msi looks like what should i turn off in your opinion also this is all my advanced nic options?

I am still testing the content inside the MSI, but I think the settings in the MSI in my screenshot are good.

I think the best settings for MSI vary greatly for everyone, but it's certain that MSI affects desync. You can try setting both the GPU and NIC to not be in MSI mode, and then remove the limit or set it to 1.

You should mainly test the MSI mode and limits of the NIC and GPU to find the most suitable for yourself. This will take some time, but not too long.I feel that testing the SDD seems to have no impact on my desync.The main focus is still on the NIC and GPU.
When USB is not in MSI mode, the mouse will be more flexible and faster, but its IRQ will become 16, which conflicts with the GPU's IRQ, so I set USB to MSI mode.

I have turned off all power saving features for the NIC and disabled all offloading (I believe offloading may cause desync).
I tried setting the MTU to 9000 and the jumbo frames to 9014; this seems to have a slight impact on desync, you can test this.
Buffers has a significant impact on desync and hitreg ; at 0, hit registration is good, but desync is bad. It seems that the best buffering value varies in every match of the game, so I set it to the midpoint value: 1024, 1024. You can also try rx4096, tx8.

屏幕截图 2025-05-13 143529.png (39.79 KiB) Viewed 5123 times

[JimCarry]

hi i am from europe and by your screen i think i did it what do you think ?

From your screenshot, it looks like you have made the settings I mentioned. You can also try other values in here to see which one suits you better. For me, my settings are currently the most suitable for me.

i also think msi off is better for the nic if you have on board,but now i am using usb external so this is how my msi looks like what should i turn off in your opinion also this is all my advanced nic options?

I am still testing the content inside the MSI, but I think the settings in the MSI in my screenshot are good.

I think the best settings for MSI vary greatly for everyone, but it's certain that MSI affects desync. You can try setting both the GPU and NIC to not be in MSI mode, and then remove the limit or set it to 1.

You should mainly test the MSI mode and limits of the NIC and GPU to find the most suitable for yourself. This will take some time, but not too long.I feel that testing the SDD seems to have no impact on my desync.The main focus is still on the NIC and GPU.
When USB is not in MSI mode, the mouse will be more flexible and faster, but its IRQ will become 16, which conflicts with the GPU's IRQ, so I set USB to MSI mode.

I have turned off all power saving features for the NIC and disabled all offloading (I believe offloading may cause desync).
I tried setting the MTU to 9000 and the jumbo frames to 9014; this seems to have a slight impact on desync, you can test this.
Buffers has a significant impact on desync and hitreg ; at 0, hit registration is good, but desync is bad. It seems that the best buffering value varies in every match of the game, so I set it to the midpoint value: 1024, 1024. You can also try rx4096, tx8.

屏幕截图 2025-05-13 143529.png

Ok

[Hyote]

Again, please don't blindly recommend people to turn off MSI Mode for their NIC, as it can make the computer unbootable.

[JimCarry]

Again, please don't blindly recommend people to turn off MSI Mode for their NIC, as it can make the computer unbootable.

[Asesino34]

I've been researching a lot about my router. A few weeks ago, I realized that if I turned the router off and on, the desync would disappear, but only for about 20–30 minutes. So I started tweaking all the settings with the help of ChatGPT. Eventually, I switched to using IGMPv2 some time ago.

But everything remains pretty much the same, or almost. I changed my MTU to 1492 because I use PPPoE.
I disabled several options on my NIC and managed to set the buffers to values of 8 and 4, which actually improved things quite a bit, at least in shooters.

Although the sluggishness in games is still there, in my opinion, it’s due to the Ethernet cable. I’ve tested this mostly in offline football games, where it’s easier to notice the difference.

With the Ethernet cable connected, the players respond in a sluggish and weird way. If the AI runs well, it ends up beating me. Without the cable, the players respond more automatically.
Although if I play online games using Wi-Fi or mobile data, the desync is still there — but not the sluggishness. I've never tried using my mobile internet directly, only Wi-Fi from my routers with the same provider.