IPTables rules missing from Flannel/CNI on Kubernetes installation #799

limited · 2017-08-24T18:32:17Z

The following IP Tables rules are missing, causing routing between nodes to not work properly between containers. I can ping between hosts, but not between containers running on hosts.

sudo  /sbin/iptables -I FORWARD 1 -i cni0 -j ACCEPT -m comment --comment "flannel subnet"
sudo  /sbin/iptables -I FORWARD 1 -o cni0 -j ACCEPT -m comment --comment "flannel subnet"
sudo /sbin/iptables -t nat -A POSTROUTING -s 10.244.0.0/16 ! -d 10.244.0.0/16 -j MASQUERADE

Expected Behavior

I expect by default, without special modifications to IPTables to connect to containers running on other flannel nodes (i.e. kube master/api-server and kube-worker).

Current Behavior

IP connectivity between containers running on flannel nodes is broken

Possible Solution

Add iptables rules above

Steps to Reproduce (for bugs)

Install k8s cluster v1.6 using kubeadm with CNI and flannel plugin.

Context

Your Environment

Flannel version: v0.7.1-amd64
Backend used (e.g. vxlan or udp): vxlan
Etcd version: 3.1
Kubernetes version (if used): 1.6 via kubeadm and CNI/Flannel plugins
Operating System and version: centos7
Link to your project (optional):

The text was updated successfully, but these errors were encountered:

cdyue · 2017-08-25T06:44:07Z

@limited Thanks!It works!

flannel version: v0.8.0

domino14 · 2017-08-27T20:07:05Z

I see this issue too. How do we make sure those iptables rules run on reboot?

cdyue · 2017-08-29T07:42:41Z

I have the same issue.But i think it's not a bug of FLANNEL.
My env:

centos 7.2
flannel: v0.8.0
docker: 17.06.0-ce
kubernetes:v1.7.4

It seems docker version >=1.13 will add iptables rule like below,and it make this issue happen:

iptables -P FORWARD DROP

All you need to do is add a rule below:

iptables -P FORWARD ACCEPT

limited · 2017-08-29T10:58:44Z

I'm using Docker 1.12, so I think the behavior must start in an earlier version. Also, I don't think its an acceptable solution to change the default behavior for an IPTables rules. My two rules are a more precise fix.

tomdee · 2017-09-18T23:10:24Z

The default changed with Docker v1.13 - https://docs.docker.com/engine/userguide/networking/default_network/container-communication/#container-communication-between-hosts

It's currently unclear to me how this issue shoudl be fixed. Maybe flannel you automatically change the iptables rules, or just document the docker change, or maybe the bridge CNI plugin should be doing something about it.

Also @limited - for NAT you should just pass the ip-masq option to flannel

limited · 2017-09-19T00:37:34Z

Thanks will give the ip-masq a shot

+ some work on flannel integration, not completed yet. See also flannel-io/flannel#799 for an issue why iptables rules need to be changed.

jeffmhastings · 2017-10-18T12:51:00Z

This seems related: containernetworking/plugins#75

roffe · 2017-10-26T18:05:28Z

containernetworking/plugins#75 originates from kubernetes/kubernetes#40182 I belive

GheRivero · 2017-11-06T11:02:12Z

I can confirm this issue with flannel 0.9.0 (both vxlan & host-gw), k8s 1.8.2, docker 17.05
Applying the iptables rules solves the problems.

To work around the Docker change from v1.13 which changed the default FORWARD policy to DROP. The change has bitten many many users. The troubleshooting documentation is also updated talk about the issue. Replaces PR flannel-io#862 Fixes flannel-io#834 Fixes flannel-io#823 Fixes flannel-io#609 Fixes flannel-io#799

balbalas · 2018-04-17T13:54:45Z

@tomdee
Do you know which version flannel has the fix? We are seeing it with 0.10.0.

[bbalasubram@cirrus-vm1 Demo]$ docker version
Client:
Version: 17.12.1-ce
API version: 1.35
Go version: go1.9.4
Git commit: 7390fc6
Built: Tue Feb 27 22:15:20 2018
OS/Arch: linux/amd64

Server:
Engine:
Version: 17.12.1-ce
API version: 1.35 (minimum version 1.12)
Go version: go1.9.4
Git commit: 7390fc6
Built: Tue Feb 27 22:17:54 2018
OS/Arch: linux/amd64
Experimental: false
[bbalasubram@cirrus-vm1 Demo]$ kubectl version
Client Version: version.Info{Major:"1", Minor:"9", GitVersion:"v1.9.4", GitCommit:"bee2d1505c4fe820744d26d41ecd3fdd4a3d6546", GitTreeState:"clean", BuildDate:"2018-03-12T16:29:47Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"9", GitVersion:"v1.9.4", GitCommit:"bee2d1505c4fe820744d26d41ecd3fdd4a3d6546", GitTreeState:"clean", BuildDate:"2018-03-12T16:21:35Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
[bbalasubram@cirrus-vm1 Demo]$

hectorqin · 2018-05-17T06:55:21Z

I see it with 0.10.0 too. And it dosen't work after i apply those iptables rules.

root@XMT01-VIDEO01:~# docker version
Client:
 Version:      1.13.1
 API version:  1.26
 Go version:   go1.6.2
 Git commit:   092cba3
 Built:        Thu Nov  2 20:40:23 2017
 OS/Arch:      linux/amd64

Server:
 Version:      1.13.1
 API version:  1.26 (minimum version 1.12)
 Go version:   go1.6.2
 Git commit:   092cba3
 Built:        Thu Nov  2 20:40:23 2017
 OS/Arch:      linux/amd64
 Experimental: false
root@XMT01-VIDEO01:~# kubectl version
Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.2", GitCommit:"81753b10df112992bf51bbc2c2f85208aad78335", GitTreeState:"clean", BuildDate:"2018-04-27T09:22:21Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.2", GitCommit:"81753b10df112992bf51bbc2c2f85208aad78335", GitTreeState:"clean", BuildDate:"2018-04-27T09:10:24Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
root@XMT01-VIDEO01:~# kubectl get po -o wide
NAME                                   READY     STATUS    RESTARTS   AGE       IP            NODE
kubernetes-bootcamp-7799cbcb86-cdsdx   1/1       Running   0          2d        10.244.3.9    xmt01-middleware01
kubernetes-bootcamp-7799cbcb86-wxglw   1/1       Running   0          2d        10.244.5.25   xmt01-web02
root@XMT01-VIDEO01:~# kubectl describe pod/kubernetes-bootcamp-7799cbcb86-cdsdx
Name:           kubernetes-bootcamp-7799cbcb86-cdsdx
Namespace:      default
Node:           xmt01-middleware01/192.168.82.113
Start Time:     Tue, 15 May 2018 10:40:38 +0800
Labels:         pod-template-hash=3355767642
                run=kubernetes-bootcamp
Annotations:    <none>
Status:         Running
IP:             10.244.3.9
Controlled By:  ReplicaSet/kubernetes-bootcamp-7799cbcb86
Containers:
  kubernetes-bootcamp:
    Container ID:   docker://f09a0af14d43335a9982ab991dcde30ca75491a879c7ca6acaed27c98370452a
    Image:          jocatalin/kubernetes-bootcamp:v2
    Image ID:       docker-pullable://jocatalin/kubernetes-bootcamp@sha256:fb1a3ced00cecfc1f83f18ab5cd14199e30adc1b49aa4244f5d65ad3f5feb2a5
    Port:           8080/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Tue, 15 May 2018 10:40:41 +0800
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-6x9qk (ro)
Conditions:
  Type           Status
  Initialized    True 
  Ready          True 
  PodScheduled   True 
Volumes:
  default-token-6x9qk:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-6x9qk
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:          <none>
root@XMT01-VIDEO01:~# curl 10.244.3.9:8080
curl: (7) Failed to connect to 10.244.3.9 port 8080: Connection timed out

root@XMT01-VIDEO01:~# iptables -nL
Chain INPUT (policy DROP)
target     prot opt source               destination         
KUBE-EXTERNAL-SERVICES  all  --  0.0.0.0/0            0.0.0.0/0            ctstate NEW /* kubernetes externally-visible service portals */
KUBE-FIREWALL  all  --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     112  --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:22
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:80
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:21
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpts:20000:30000
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:443
ACCEPT     tcp  --  192.168.82.0/24      0.0.0.0/0            tcp dpt:111
ACCEPT     udp  --  192.168.82.0/24      0.0.0.0/0            udp dpt:111
ACCEPT     tcp  --  192.168.82.0/24      0.0.0.0/0            tcp dpt:2049
ACCEPT     udp  --  192.168.82.0/24      0.0.0.0/0            udp dpt:2049
ACCEPT     tcp  --  192.168.82.0/24      0.0.0.0/0            tcp dpts:30001:30004
ACCEPT     udp  --  192.168.82.0/24      0.0.0.0/0            udp dpts:30001:30004
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:6443
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpts:10250:10252
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:10255
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpts:30000:32767
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpts:2379:2380
ACCEPT     icmp --  0.0.0.0/0            0.0.0.0/0            limit: avg 1/sec burst 10
ACCEPT     all  -f  0.0.0.0/0            0.0.0.0/0            limit: avg 100/sec burst 100
syn-flood  tcp  --  0.0.0.0/0            0.0.0.0/0            tcp flags:0x17/0x02
REJECT     all  --  0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            /* flannel subnet */
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            /* flannel subnet */
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            /* flannel subnet */
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            /* flannel subnet */
KUBE-FORWARD  all  --  0.0.0.0/0            0.0.0.0/0            /* kubernetes forwarding rules */
DOCKER-ISOLATION  all  --  0.0.0.0/0            0.0.0.0/0           
DOCKER     all  --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            ctstate RELATED,ESTABLISHED
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     all  --  10.244.0.0/16        0.0.0.0/0           
ACCEPT     all  --  0.0.0.0/0            10.244.0.0/16       

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
KUBE-SERVICES  all  --  0.0.0.0/0            0.0.0.0/0            ctstate NEW /* kubernetes service portals */
KUBE-FIREWALL  all  --  0.0.0.0/0            0.0.0.0/0           

Chain DOCKER (1 references)
target     prot opt source               destination         

Chain DOCKER-ISOLATION (1 references)
target     prot opt source               destination         
RETURN     all  --  0.0.0.0/0            0.0.0.0/0           

Chain KUBE-EXTERNAL-SERVICES (1 references)
target     prot opt source               destination         

Chain KUBE-FIREWALL (2 references)
target     prot opt source               destination         
DROP       all  --  0.0.0.0/0            0.0.0.0/0            /* kubernetes firewall for dropping marked packets */ mark match 0x8000/0x8000

Chain KUBE-FORWARD (1 references)
target     prot opt source               destination         
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            /* kubernetes forwarding rules */ mark match 0x4000/0x4000
ACCEPT     all  --  10.244.0.0/16        0.0.0.0/0            /* kubernetes forwarding conntrack pod source rule */ ctstate RELATED,ESTABLISHED
ACCEPT     all  --  0.0.0.0/0            10.244.0.0/16        /* kubernetes forwarding conntrack pod destination rule */ ctstate RELATED,ESTABLISHED

Chain KUBE-SERVICES (1 references)
target     prot opt source               destination         

Chain syn-flood (1 references)
target     prot opt source               destination         
RETURN     tcp  --  0.0.0.0/0            0.0.0.0/0            limit: avg 3/sec burst 6
REJECT     all  --  0.0.0.0/0            0.0.0.0/0            reject-with icmp-port-unreachable
root@XMT01-VIDEO01:~#

root@XMT01-MIDDLEWARE01:~# iptables -nL
Chain INPUT (policy DROP)
target     prot opt source               destination         
KUBE-EXTERNAL-SERVICES  all  --  0.0.0.0/0            0.0.0.0/0            ctstate NEW /* kubernetes externally-visible service portals */
KUBE-FIREWALL  all  --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:22
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:80
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:443
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:4869 /* zimg server */
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpts:8000:8100 /* proxy server */
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:6443
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpts:10250:10252
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:10255
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpts:30000:32767
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpts:2379:2380
ACCEPT     icmp --  0.0.0.0/0            0.0.0.0/0            limit: avg 1/sec burst 10
ACCEPT     all  -f  0.0.0.0/0            0.0.0.0/0            limit: avg 100/sec burst 100
syn-flood  tcp  --  0.0.0.0/0            0.0.0.0/0            tcp flags:0x17/0x02
REJECT     all  --  0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            /* flannel subnet */
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            /* flannel subnet */
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            /* flannel subnet */
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            /* flannel subnet */
KUBE-FORWARD  all  --  0.0.0.0/0            0.0.0.0/0            /* kubernetes forwarding rules */
DOCKER-ISOLATION  all  --  0.0.0.0/0            0.0.0.0/0           
DOCKER     all  --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            ctstate RELATED,ESTABLISHED
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     all  --  10.244.0.0/16        0.0.0.0/0           
ACCEPT     all  --  0.0.0.0/0            10.244.0.0/16       

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
KUBE-SERVICES  all  --  0.0.0.0/0            0.0.0.0/0            ctstate NEW /* kubernetes service portals */
KUBE-FIREWALL  all  --  0.0.0.0/0            0.0.0.0/0           

Chain DOCKER (1 references)
target     prot opt source               destination         

Chain DOCKER-ISOLATION (1 references)
target     prot opt source               destination         
RETURN     all  --  0.0.0.0/0            0.0.0.0/0           

Chain KUBE-EXTERNAL-SERVICES (1 references)
target     prot opt source               destination         

Chain KUBE-FIREWALL (2 references)
target     prot opt source               destination         
DROP       all  --  0.0.0.0/0            0.0.0.0/0            /* kubernetes firewall for dropping marked packets */ mark match 0x8000/0x8000

Chain KUBE-FORWARD (1 references)
target     prot opt source               destination         
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            /* kubernetes forwarding rules */ mark match 0x4000/0x4000
ACCEPT     all  --  10.244.0.0/16        0.0.0.0/0            /* kubernetes forwarding conntrack pod source rule */ ctstate RELATED,ESTABLISHED
ACCEPT     all  --  0.0.0.0/0            10.244.0.0/16        /* kubernetes forwarding conntrack pod destination rule */ ctstate RELATED,ESTABLISHED

Chain KUBE-SERVICES (1 references)
target     prot opt source               destination         

Chain syn-flood (1 references)
target     prot opt source               destination         
RETURN     tcp  --  0.0.0.0/0            0.0.0.0/0            limit: avg 3/sec burst 6
REJECT     all  --  0.0.0.0/0            0.0.0.0/0            reject-with icmp-port-unreachable

strigazi · 2018-11-20T13:53:29Z

I think this issue need to be re-opened. WIth [0], I still need to apply iptables -P FORWARD ACCEPT

[0] quay.io/coreos/flannel:v0.10.0-amd64

cc @tomdee

FengyunPan2 · 2019-01-21T08:42:52Z

I see it with 0.10.0 too.
/reopen

ajay-alef · 2019-01-26T05:09:36Z

I was also facing the same, until I allowed "All Traffic" in aws security group.

rajeshmuraleedharan · 2019-02-24T07:31:22Z

Flushed all my firewalls with iptables --flush and iptables -tnat --flush then restart docker fixed it

check this link

To work around the Docker change from v1.13 which changed the default FORWARD policy to DROP. The change has bitten many many users. The troubleshooting documentation is also updated talk about the issue. Replaces PR flannel-io#862 Fixes flannel-io#834 Fixes flannel-io#823 Fixes flannel-io#609 Fixes flannel-io#799

HindrikStegenga · 2019-10-18T08:31:52Z

I fixed it permanently by doing this:
Edit /etc/sysctl.conf
Add line: net.ipv4.ip_forward=1
Reboot

mcoto004CR · 2019-12-04T00:12:14Z

Modifying the /etc/sysctl.conf made the trick, txs

Peter0x48 · 2020-04-19T18:31:39Z

For me too, after that the iptables policy for Forward is set to ACCEPT, before that it was DROP and traffic worked only if i set the policy manually to ACCEPT.

Is this really the correct solution for this? I would prefer if the policy stays at DROP and appropriate rules allow the traffic needed.

echoface · 2023-06-21T11:14:02Z

[UFW BLOCK] IN=flannel.1 OUT=cni0 MAC=72:b6:26:dd:65:45:8a:ad:1c:19:5b:d5:08:00 SRC=10.244.1.8 DST=10.244.0.14 LEN=93 TOS=0x00 PREC=0x00 TTL=62 ID=22646 DF PROTO=UDP SPT=52343 DPT=53 LEN=73

sudo ufw allow in on flannel.1 && sudo ufw allow out on flannel.1
sudo ufw allow in on cni0 && sudo ufw allow out on cni0
both configured, but still not work;

any suggestion?

tomdee added the dependency/external label Sep 18, 2017

pmatety mentioned this issue Sep 21, 2017

Pod IP not accessible from master node kubernetes/kubernetes#52671

Closed

inmylo mentioned this issue Sep 27, 2017

Kubernetes, can't reach other node services kubernetes/kubernetes#52783

Closed

rhuss added a commit to rhuss/ansible-kubernetes-openshift-pi3 that referenced this issue Oct 12, 2017

fix: docker.service file

99e0bf4

+ some work on flannel integration, not completed yet. See also flannel-io/flannel#799 for an issue why iptables rules need to be changed.

rhuss added a commit to rhuss/ansible-kubernetes-openshift-pi3 that referenced this issue Oct 12, 2017

fix: docker.service file

26255c6

+ some work on flannel integration, not completed yet. See also flannel-io/flannel#799 for an issue why iptables rules need to be changed.

This was referenced Oct 12, 2017

fix: docker.service file Project31/ansible-kubernetes-openshift-pi3#31

Merged

Docker downgrade fails Project31/ansible-kubernetes-openshift-pi3#28

Closed

tomdee added the component/masq label Nov 3, 2017

tomdee mentioned this issue Nov 11, 2017

network/iptables: Add iptables rules to FORWARD chain #872

Merged

tomdee closed this as completed in #872 Nov 16, 2017

jverger mentioned this issue May 14, 2018

cant connect to pods from external k8s nodes , k8s nodes can connect only to local pods, load balancing doesnt work properly #823

Closed

isen-ng mentioned this issue Apr 22, 2019

Error: unreachable backend (use in kubernetes) coredns/coredns#2284

Closed

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IPTables rules missing from Flannel/CNI on Kubernetes installation #799

IPTables rules missing from Flannel/CNI on Kubernetes installation #799

limited commented Aug 24, 2017

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mcoto004CR commented Dec 4, 2019

Peter0x48 commented Apr 19, 2020

echoface commented Jun 21, 2023

IPTables rules missing from Flannel/CNI on Kubernetes installation #799

IPTables rules missing from Flannel/CNI on Kubernetes installation #799

Comments

limited commented Aug 24, 2017

Expected Behavior

Current Behavior

Possible Solution

Steps to Reproduce (for bugs)

Context

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cdyue commented Aug 25, 2017 • edited Loading

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cdyue commented Aug 29, 2017

limited commented Aug 29, 2017

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limited commented Sep 19, 2017

jeffmhastings commented Oct 18, 2017

roffe commented Oct 26, 2017

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Peter0x48 commented Apr 19, 2020

echoface commented Jun 21, 2023

cdyue commented Aug 25, 2017 •

edited

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strigazi commented Nov 20, 2018 •

edited

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HindrikStegenga commented Oct 18, 2019 •

edited

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