Modify multicast in optical modem to less desync and hitreg

[JimCarry]

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.

[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.

i have cat8 cabble i dont have wifi to test if its from the cabble,my usb nic is like yours 8and 4 and its from 2015,this is the default,so you are saying that me and op and anyone here must be using v2 not v3 ?

I think everyone should test and check things for themselves. Personally, I've been using IGMPv2 for a while now, and regarding the Ethernet cable — mine is just a regular, low-quality Cat 5e cable, around 20 meters long

For quite a long time, maybe a year, I had a 1-meter Cat 8 connection, and it was unplayable. I don’t remember now if the sluggish feeling was the same.

In my opinion, everything comes down to a good ground connection (since I’ve read several times here that it’s the only real solution), or something related to the router. That said, I think the best thing to do for now is to change the NIC buffer settings — at least that’s what worked best for me so far

[JimCarry]

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.

i have cat8 cabble i dont have wifi to test if its from the cabble,my usb nic is like yours 8and 4 and its from 2015,this is the default,so you are saying that me and op and anyone here must be using v2 not v3 ?

I think everyone should test and check things for themselves. Personally, I've been using IGMPv2 for a while now, and regarding the Ethernet cable — mine is just a regular, low-quality Cat 5e cable, around 20 meters long

For quite a long time, maybe a year, I had a 1-meter Cat 8 connection, and it was unplayable. I don’t remember now if the sluggish feeling was the same.

In my opinion, everything comes down to a good ground connection (since I’ve read several times here that it’s the only real solution), or something related to the router. That said, I think the best thing to do for now is to change the NIC buffer settings — at least that’s what worked best for me so far

change them to what ?

how can i know is v2 is better then v3 ?

[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.

i have cat8 cabble i dont have wifi to test if its from the cabble,my usb nic is like yours 8and 4 and its from 2015,this is the default,so you are saying that me and op and anyone here must be using v2 not v3 ?

I think everyone should test and check things for themselves. Personally, I've been using IGMPv2 for a while now, and regarding the Ethernet cable — mine is just a regular, low-quality Cat 5e cable, around 20 meters long

For quite a long time, maybe a year, I had a 1-meter Cat 8 connection, and it was unplayable. I don’t remember now if the sluggish feeling was the same.

In my opinion, everything comes down to a good ground connection (since I’ve read several times here that it’s the only real solution), or something related to the router. That said, I think the best thing to do for now is to change the NIC buffer settings — at least that’s what worked best for me so far

change them to what ?

how can i know is v2 is better then v3 ?

I haven’t changed many settings:

Speed and duplex set to 2.5 Gb

Flow control: off

Interrupt moderation: off

Checksum offloading: off

Chimney offload: off

LSO: off

Receive segment coalescing: off

Transmit buffer: 8

Receive buffer: 4

MTU set to 1492
MSI limit set to 1, with MSI option ON and priority set to High

As for IGMP, it’s really a matter of trial and error. I left it that way because, I don’t know, I feel like it can’t get any better than how it’s working now. I don’t have hit registration issues, but I do still have some desync — although not as much since I changed the buffer settings

[JimCarry]

i have cat8 cabble i dont have wifi to test if its from the cabble,my usb nic is like yours 8and 4 and its from 2015,this is the default,so you are saying that me and op and anyone here must be using v2 not v3 ?

I think everyone should test and check things for themselves. Personally, I've been using IGMPv2 for a while now, and regarding the Ethernet cable — mine is just a regular, low-quality Cat 5e cable, around 20 meters long

For quite a long time, maybe a year, I had a 1-meter Cat 8 connection, and it was unplayable. I don’t remember now if the sluggish feeling was the same.

In my opinion, everything comes down to a good ground connection (since I’ve read several times here that it’s the only real solution), or something related to the router. That said, I think the best thing to do for now is to change the NIC buffer settings — at least that’s what worked best for me so far

change them to what ?

how can i know is v2 is better then v3 ?

I haven’t changed many settings:

Speed and duplex set to 2.5 Gb

Flow control: off

Interrupt moderation: off

Checksum offloading: off

Chimney offload: off

LSO: off

Receive segment coalescing: off

Transmit buffer: 8

Receive buffer: 4

MTU set to 1492
MSI limit set to 1, with MSI option ON and priority set to High

As for IGMP, it’s really a matter of trial and error. I left it that way because, I don’t know, I feel like it can’t get any better than how it’s working now. I don’t have hit registration issues, but I do still have some desync — although not as much since I changed the buffer settings

can you read this topic from the start ?

[Syykfk]

Ok so in the end i change some settings to work,but it looks like yours on screenshot, thanks for sharing is there any other settings in the router,because we must have the same router right? mine menu and yours are exactly the same only the language is different? also you did not ask me about my receive / transmit because they are not visible in the screen,i dont know why it does not show them but they are 8 and 4 maybe you try them ? because i tried everthing from 4 to 6144,1024,4096 etc,pretty much all values.
Also i cant untick msi mode for my nic now,as i show in the picture, and you cant even see it becase my nic is now in the usb,but for gpu i can.

I turned off UPNP and IPV6 in the optical modem, set my IP to DMZ, enabled NAT, and configured the NAT type to: full cone NAT.

I think rb tb 1024 1024 is more suitable for me right now, but I will try other values later. I tried 8 4 today, and it wasn't very good.

Regarding the MSI mode of the NIC, I saw some people say that disabling the MSI mode of the NIC greatly improved their shooting experience in the game. However, after testing it myself, I didn't notice much difference, so I decided to keep it in MSI mode.
The MSI mode of the GPU is very obvious to me. When my GPU is in MSI mode, my hit registration is very poor, and I encounter desync much more frequently, so I have set it to no MSI mode.

Currently, everything about MSI is still the same as the screenshots at the beginning of this article, nothing has changed.

[JimCarry]

Ok so in the end i change some settings to work,but it looks like yours on screenshot, thanks for sharing is there any other settings in the router,because we must have the same router right? mine menu and yours are exactly the same only the language is different? also you did not ask me about my receive / transmit because they are not visible in the screen,i dont know why it does not show them but they are 8 and 4 maybe you try them ? because i tried everthing from 4 to 6144,1024,4096 etc,pretty much all values.
Also i cant untick msi mode for my nic now,as i show in the picture, and you cant even see it becase my nic is now in the usb,but for gpu i can.

I turned off UPNP and IPV6 in the optical modem, set my IP to DMZ, enabled NAT, and configured the NAT type to: full cone NAT.

I think rb tb 1024 1024 is more suitable for me right now, but I will try other values later. I tried 8 4 today, and it wasn't very good.

Regarding the MSI mode of the NIC, I saw some people say that disabling the MSI mode of the NIC greatly improved their shooting experience in the game. However, after testing it myself, I didn't notice much difference, so I decided to keep it in MSI mode.
The MSI mode of the GPU is very obvious to me. When my GPU is in MSI mode, my hit registration is very poor, and I encounter desync much more frequently, so I have set it to no MSI mode.

Currently, everything about MSI is still the same as the screenshots at the beginning of this article, nothing has changed.

ok thanks so mine msi is almost the same like yours i turn off msi mode for gpu,yours is high and your nic is low why ? and thanks for sharing the router options i will try them today later.

[JimCarry]

Regarding the MSI mode of the NIC, I saw some people say that disabling the MSI mode of the NIC greatly improved their shooting experience in the game. However, after testing it myself, I didn't notice much difference, so I decided to keep it in MSI mode.

yes

[JimCarry]

I turned off UPNP and IPV6 in the optical modem, set my IP to DMZ, enabled NAT, and configured the NAT type to: full cone NAT.

ok my UPNP is off too,i cant find:

"IPV6 in the optical modem"
"set my IP to DMZ"
" enabled NAT"
"configured the NAT type to: full cone NAT"

can you help me ?

[Syykfk]

ok my UPNP is off too,i cant find:

"IPV6 in the optical modem"
"set my IP to DMZ"
" enabled NAT"
"configured the NAT type to: full cone NAT"

can you help me ?

In this WAN configuration, DMZ is not important; NAT will replace it.

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屏幕截图 2025-05-14 172207.png (17.44 KiB) Viewed 1990 times

Additionally, I want to ask you,
“my case on board realtek 2.5gb msi mode off is better and from high priority to undefined it fixes peeking."
why are you still switching to a new USB NIC?


I just tried it again, and for me, disabling the NIC's MSI mode makes it worse; the desync is more pronounced than when MSI mode is enabled,But their gap is not very large.
I don't know why this is the case. I noticed from others' reports that usually, disabling the NIC's MSI mode lessens the desync, but I experience the opposite.