[GH-ISSUE #1921] Docker Client fails to create iptables Forward rules and DNS probing on Synology. #3716

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saavagebueno · 2026-08-05T00:53:56-04:00

saavagebueno commented

2026-08-05 00:53:56 -04:00

Originally created by @zzecool on GitHub (May 4, 2024).
Original GitHub issue: https://github.com/netbirdio/netbird/issues/1921

Describe the problem
Running Docker Client version 0.27.4 and getting the following errors :

024-05-04T15:43:42.465646724Z 2024-05-04T15:43:42Z ERRO client/internal/routemanager/server_nonandroid.go:66: Unable to add route copsvubnabic73cqrb2g from server, got: insert routing rules: error while adding new forwarding rule for 10.0.0.0/24: running [/sbin/iptables -t filter -I NETBIRD-RT-FWD 1 -s 100.110.0.0/16 -d 10.0.0.0/24 -j ACCEPT -m comment --comment netbird-fwd-copsvubnabic73cqrb2g --wait]: exit status 1: Warning: Extension comment revision 0 not supported, missing kernel module?
2024-05-04T15:43:42.466373439Z iptables: No chain/target/match by that name.
2024-05-04T15:43:42.466462423Z 
2024-05-04T15:43:42.466507482Z 2024-05-04T15:43:42Z INFO client/internal/acl/manager.go:52: ACL rules processed in: 34.549µs, total rules count: 2
2024-05-04T15:43:44.466974354Z 2024-05-04T15:43:44Z WARN client/internal/dns/upstream.go:185: probing upstream nameserver 1.1.1.1:53: read udp 172.23.0.2:43795->1.1.1.1:53: i/o timeout
2024-05-04T15:43:44.467586003Z 2024-05-04T15:43:44Z WARN client/internal/dns/upstream.go:185: probing upstream nameserver 1.0.0.1:53: read udp 172.23.0.2:48481->1.0.0.1:53: i/o timeout
2024-05-04T18:36:33.561437284Z 2024-05-04T18:36:33Z WARN client/internal/engine.go:512: running SSH server is not permitted
2024-05-04T18:36:33.566448223Z 2024-05-04T18:36:33Z ERRO client/internal/routemanager/server_nonandroid.go:66: Unable to add route copsvubnabic73cqrb2g from server, got: insert routing rules: error while adding new forwarding rule for 10.0.0.0/24: running [/sbin/iptables -t filter -I NETBIRD-RT-FWD 1 -s 100.110.0.0/16 -d 10.0.0.0/24 -j ACCEPT -m comment --comment netbird-fwd-copsvubnabic73cqrb2g --wait]: exit status 1: Warning: Extension comment revision 0 not supported, missing kernel module?

As you can see server is telling this client that he is a routing peer for 10.0.0.0/24 but the client fails to apply the iptable rule to make the routing work.

The server where the Docker Client is running is a Synology one and the problem is the iptables version:

If i try the same rule directly on the Host :

iptables v1.8.3 (legacy): Couldn't load match comment':No such file or directory

To avoid this problem a simple solution would be to implement a "iptables --version" check ( clean )
Or to just retry without commenting ( dirty )

Even without the comment in this version of iptable you need to create the Chain before hand like this :

Another problem which i dont understand is this :

2024-05-04T15:43:44.466974354Z 2024-05-04T15:43:44Z WARN client/internal/dns/upstream.go:185: probing upstream nameserver 1.1.1.1:53: read udp 172.23.0.2:43795->1.1.1.1:53: i/o timeout
2024-05-04T15:43:44.467586003Z 2024-05-04T15:43:44Z WARN client/internal/dns/upstream.go:185: probing upstream nameserver 1.0.0.1:53: read udp 172.23.0.2:48481->1.0.0.1:53: i/o timeout

Cause if i connect in the container with a console i can resolve just fine

Same results for 1.0.0.1

Please help me fix this as your native linux app fails to install as well in Synology, but this is for another issue.

Thanks in advance.

Originally created by @zzecool on GitHub (May 4, 2024). Original GitHub issue: https://github.com/netbirdio/netbird/issues/1921 **Describe the problem** Running Docker Client version 0.27.4 and getting the following errors : ``` 024-05-04T15:43:42.465646724Z 2024-05-04T15:43:42Z ERRO client/internal/routemanager/server_nonandroid.go:66: Unable to add route copsvubnabic73cqrb2g from server, got: insert routing rules: error while adding new forwarding rule for 10.0.0.0/24: running [/sbin/iptables -t filter -I NETBIRD-RT-FWD 1 -s 100.110.0.0/16 -d 10.0.0.0/24 -j ACCEPT -m comment --comment netbird-fwd-copsvubnabic73cqrb2g --wait]: exit status 1: Warning: Extension comment revision 0 not supported, missing kernel module? 2024-05-04T15:43:42.466373439Z iptables: No chain/target/match by that name. 2024-05-04T15:43:42.466462423Z 2024-05-04T15:43:42.466507482Z 2024-05-04T15:43:42Z INFO client/internal/acl/manager.go:52: ACL rules processed in: 34.549µs, total rules count: 2 2024-05-04T15:43:44.466974354Z 2024-05-04T15:43:44Z WARN client/internal/dns/upstream.go:185: probing upstream nameserver 1.1.1.1:53: read udp 172.23.0.2:43795->1.1.1.1:53: i/o timeout 2024-05-04T15:43:44.467586003Z 2024-05-04T15:43:44Z WARN client/internal/dns/upstream.go:185: probing upstream nameserver 1.0.0.1:53: read udp 172.23.0.2:48481->1.0.0.1:53: i/o timeout 2024-05-04T18:36:33.561437284Z 2024-05-04T18:36:33Z WARN client/internal/engine.go:512: running SSH server is not permitted 2024-05-04T18:36:33.566448223Z 2024-05-04T18:36:33Z ERRO client/internal/routemanager/server_nonandroid.go:66: Unable to add route copsvubnabic73cqrb2g from server, got: insert routing rules: error while adding new forwarding rule for 10.0.0.0/24: running [/sbin/iptables -t filter -I NETBIRD-RT-FWD 1 -s 100.110.0.0/16 -d 10.0.0.0/24 -j ACCEPT -m comment --comment netbird-fwd-copsvubnabic73cqrb2g --wait]: exit status 1: Warning: Extension comment revision 0 not supported, missing kernel module? ``` As you can see server is telling this client that he is a routing peer for 10.0.0.0/24 but the client fails to apply the iptable rule to make the routing work. The server where the Docker Client is running is a Synology one and the problem is the iptables version: If i try the same rule directly on the Host : `iptables v1.8.3 (legacy): Couldn't load match comment':No such file or directory` To avoid this problem a simple solution would be to implement a "iptables --version" check ( clean ) Or to just retry without commenting ( dirty ) Even without the comment in this version of iptable you need to create the Chain before hand like this : ![iptables](https://github.com/netbirdio/netbird/assets/2816897/98423b16-8911-42df-8991-f99e40312a07) -------------------------------------------------------------------------------------------------------------------------------------------- Another problem which i dont understand is this : ``` 2024-05-04T15:43:44.466974354Z 2024-05-04T15:43:44Z WARN client/internal/dns/upstream.go:185: probing upstream nameserver 1.1.1.1:53: read udp 172.23.0.2:43795->1.1.1.1:53: i/o timeout 2024-05-04T15:43:44.467586003Z 2024-05-04T15:43:44Z WARN client/internal/dns/upstream.go:185: probing upstream nameserver 1.0.0.1:53: read udp 172.23.0.2:48481->1.0.0.1:53: i/o timeout ``` Cause if i connect in the container with a console i can resolve just fine ![image](https://github.com/netbirdio/netbird/assets/2816897/1353b788-91ca-44cb-bd21-9f297a34d463) Same results for 1.0.0.1 Please help me fix this as your native linux app fails to install as well in Synology, but this is for another issue. Thanks in advance.

saavagebueno added the triage-needed label 2026-08-05 00:53:56 -04:00

saavagebueno referenced this issue

2026-08-05 01:12:43 -04:00

[GH-ISSUE #3716] "308 - The page isn’t redirecting properly" using Quickstart guide (Caddy behind Cloudflare proxy) #7376

saavagebueno referenced this issue

2026-08-05 01:14:31 -04:00

[GH-ISSUE #3716] "308 - The page isn’t redirecting properly" using Quickstart guide (Caddy behind Cloudflare proxy) #7777

saavagebueno referenced this issue

2026-08-05 01:15:11 -04:00

[GH-ISSUE #3716] "308 - The page isn’t redirecting properly" using Quickstart guide (Caddy behind Cloudflare proxy) #7907

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feature/keep_alive

feat-groups-from-jwt

separate_proxy_from_wgconfig

fix/wg_conn

wg_conn_fix

wg_bind_parallel_processing

fix-rollback-get-acls

proxy_cfg_cleanup

performance-improvement-rego

update-lock-log-level

feat-client-side-acl

refactor/move_grpcserver_logic_to_account_manager

feature/event-storage

feature/update-idp-redeeming-invite

feature/api-peer-info

return-groupminimum-setupkey

feature/interface-bind

documentation_enhancement

fix-peer-registration

ssh

users_cache

pass-client-caller

client_caller_type

revert-283-feat-fix-windows-installer

periodic-peer-updates

ebpf

braginini/wasm

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Reference: DYNR/netbird#3716