[GH-ISSUE #323] Network Condition: Network Logic #3 #324

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opened 2026-03-03 19:49:52 +03:00 by kerem · 2 comments

kerem commented

2026-03-03 19:49:52 +03:00

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Originally created by @NghiaTranUIT on GitHub (Oct 30, 2023).
Original GitHub issue: https://github.com/ProxymanApp/proxyman-windows-linux/issues/323

Originally assigned to: @kics223w1 on GitHub.

Description

It's time to implement the Network Condition. It's quite tricky because I haven't found any reliable npm package (with a high download number and active maintenance).

Some examples (not reliable):

https://github.com/bcoe/crapify
https://github.com/derhuerst/simulate-network-conditions
https://github.com/h2non/toxy/tree/master/lib/poisons (We can read this code and reuse it on Proxyman)

Acceptance Criteria

Find a npm package that can help implement the Network Condition
Or read some code and bring it Proxyman (e.g toxy library)
Implement the logic to simulate: Upload = Client -> Proxyman -> Server. Download = Server -> Proxyman -> Client
Download Bandwidth
Download Package Drop Rate
Download delay (latency)
Upload Bandwidth
Upload Package Drop Rate
Upload delay (latency)

NOTE

If a connection is matched with a Network Condition Rule -> It should be handled by the Network Condition.
Other connections (don't match the network) -> It works as normal.
If the Wide-System rule is activated -> ALL traffic is affected

Originally created by @NghiaTranUIT on GitHub (Oct 30, 2023). Original GitHub issue: https://github.com/ProxymanApp/proxyman-windows-linux/issues/323 Originally assigned to: @kics223w1 on GitHub. ## Description It's time to implement the Network Condition. It's quite tricky because I haven't found any reliable npm package (with a high download number and active maintenance). Some examples (not reliable): - https://github.com/bcoe/crapify - https://github.com/derhuerst/simulate-network-conditions - https://github.com/h2non/toxy/tree/master/lib/poisons (We can read this code and reuse it on Proxyman) ## Acceptance Criteria - [x] Find a npm package that can help implement the Network Condition - [x] Or read some code and bring it Proxyman (e.g toxy library) - Implement the logic to simulate: Upload = `Client -> Proxyman -> Server`. Download = `Server -> Proxyman -> Client` - [x] Download [Bandwidth](https://github.com/h2non/toxy/blob/master/lib/poisons/bandwidth.js) - [x] Download Package Drop Rate - [x] Download [delay (latency)](https://github.com/h2non/toxy/blob/master/lib/poisons/latency.js) - [x] Upload [Bandwidth](https://github.com/h2non/toxy/blob/master/lib/poisons/bandwidth.js) - [x] Upload Package Drop Rate - [x] Upload [delay (latency)](https://github.com/h2non/toxy/blob/master/lib/poisons/latency.js) ### NOTE - If a connection is matched with a Network Condition Rule -> It should be handled by the Network Condition. - Other connections (don't match the network) -> It works as normal. - If the Wide-System rule is activated -> ALL traffic is affected

kerem added the

✅ Done

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2026-03-03 19:49:52 +03:00

kerem commented

2026-03-03 19:49:53 +03:00

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@NghiaTranUIT commented on GitHub (Oct 30, 2023):

How to test:

Case 1: Happy Case

Create a new Network Condition Rule -> Tick System-Wide -> Select 4G profile
Open https://fast.com/ and confirm that Bandwidth matches with 4G profile
Open Youtube or some website -> Notice the internet speed is slow as intended
Repeat with 3G profile and confirm the speed is slower
Disable the Rule or Tool
Confirm all network backs to normal

Case 2: Enable 1 rule

Create a new Network Condition Rule -> Host = fast.com -> Select 4G profile
Open https://fast.com/ and confirm that Bandwidth matches with 4G profile
Open https://www.speedtest.net/ -> Confirm it has full speed because we only apply Network Condition to fast.com
Open Rule view -> Disable it
Confirm fast.com runs as normal speed.

@NghiaTranUIT commented on GitHub (Oct 30, 2023): ### How to test: #### Case 1: Happy Case 1. Create a new Network Condition Rule -> Tick `System-Wide` -> Select 4G profile 2. Open https://fast.com/ and confirm that Bandwidth matches with 4G profile 3. Open Youtube or some website -> Notice the internet speed is slow as intended 4. Repeat with 3G profile and confirm the speed is slower 5. Disable the Rule or Tool 6. Confirm all network backs to normal #### Case 2: Enable 1 rule 1. Create a new Network Condition Rule -> Host = `fast.com` -> Select 4G profile 2. Open https://fast.com/ and confirm that Bandwidth matches with 4G profile 3. Open `https://www.speedtest.net/` -> Confirm it has full speed because we only apply Network Condition to `fast.com` 4. Open Rule view -> Disable it 5. Confirm fast.com runs as normal speed.

kerem commented

2026-03-03 19:49:53 +03:00

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@NghiaTranUIT commented on GitHub (Oct 30, 2023):

Case 3: 100% loss

Create a new Network Condition Rule -> Wide-System rule -> Select 100% loss
Open any website -> Confirm all connections are waiting forever -> It doesn't close the connection.
Open Rule view -> Disable it
Confirm all websites just works fine

@NghiaTranUIT commented on GitHub (Oct 30, 2023): #### Case 3: 100% loss 1. Create a new Network Condition Rule -> Wide-System rule -> Select `100% loss` 2. Open any website -> Confirm all connections are waiting forever -> It doesn't close the connection. 4. Open Rule view -> Disable it 5. Confirm all websites just works fine