Category Archives: Ubuntu

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15
02
25
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Further investigation of Asterisk logs

Posted by | Ubuntu | Tagged |

Clients A and B are in Windows Sandboxes behind a router in a local network.

Client A:

   Connection-specific DNS Suffix  . : mshome.net
   Link-local IPv6 Address . . . . . : fe80::db7a:bb9e:748a:f5a9%205
   IPv4 Address. . . . . . . . . . . : 172.28.33.149
   Subnet Mask . . . . . . . . . . . : 255.255.240.0
   Default Gateway . . . . . . . . . : 172.28.32.1

Client B:

   Connection-specific DNS Suffix . : mshome.net
   Link-local IPv6 Address . . . . . : fe80::d607:36fe:46b0:b7dc%205
   IPv4 Address. . . . . . . . . . . : 172.24.106.63
   Subnet Mask . . . . . . . . . . . : 255.255.240.0
   Default Gateway . . . . . . . . . : 172.24.96.1
(more…)
13
02
25
 1 Comment

Investigating Asterisk logs

Posted by | Ubuntu | Tagged |

Client C successfully call client A, but a call in the reverse direction fails. Client B successfully calls client A. See my previous post for my Asterisk configuration and clients.

IP addresses

IP address of client C is 176.15.165.103 and external IP address of client A is 91.122.37.167. Server IP address is 172.236.29.157.

172.28.33.149 is the local IP address of client A in Windows Sandbox (which external IP address is 91.122.37.167):

C:\Users\WDAGUtilityAccount>ipconfig

Windows IP Configuration


Ethernet adapter Ethernet:

   Connection-specific DNS Suffix  . : mshome.net
   Link-local IPv6 Address . . . . . : fe80::db7a:bb9e:748a:f5a9%205
   IPv4 Address. . . . . . . . . . . : 172.28.33.149
   Subnet Mask . . . . . . . . . . . : 255.255.240.0
   Default Gateway . . . . . . . . . : 172.28.32.1
(more…)
12
02
25
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Further experimentations with PJSIP

Posted by | Ubuntu | Tagged |

I have two clients in Sandboxes on Windows 10 machines in a local network behind a router. First client is Linphone (client A) and second client is ZoiPer (client B), so the clients A and B are behind NAT. Also I have Linphone (client C), ZipPer (client D) and PortSIP (client F) on my Android mobile phone connected to the internet over 4G (so there is no NAT). The server is in the Docker container with default network configuration with all the ports mapped to the host.

My Asterisk configuration:

rtp.conf:

[general]
rtpstart=10000
rtpend=10099
(more…)
10
02
25
 20 Comments

Connecting two phones to Asterisk with PJSIP

Posted by | Ubuntu | Tagged |

I was able to connect to Asterisk running in a Docker container using Linphone app:

(more…)
31
01
25
 8 Comments

Running Asterisk 22 in a Docker container

Posted by | Ubuntu | Tagged |

I build and run Asterisk 22 in a Docker container on my Ubuntu 24.04 and it started to use 100% CPU and within a few hours consumed 100% of the disk space:

(more…)
27
01
25
 3 Comments

Preventing OpenVPN clients from seeing each other

Posted by | Ubuntu | Tagged |

Listing existing rules

sudo docker exec -it dockovpn_dockovpn_1 bash
iptables --list

Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     udp  --  anywhere             anywhere             state NEW,ESTABLISHED udp dpt:openvpn
ACCEPT     all  --  anywhere             anywhere

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere
ACCEPT     all  --  10.8.0.0/24          anywhere
ACCEPT     all  --  anywhere             anywhere             state RELATED,ESTABLISHED

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     udp  --  anywhere             anywhere             state ESTABLISHED udp spt:openvpn
ACCEPT     all  --  anywhere             anywhere
(more…)
26
01
25
 4 Comments

Running VPN Server with Access Server in a Docker container

Posted by | Ubuntu | Tagged |

Run the docker container:

sudo docker pull openvpn/openvpn-as
sudo ufw allow 1194/udp
sudo ufw allow 943/tcp
sudo ufw allow 1443/tcp

sudo docker run -d --rm \
  --name=openvpn-as --device /dev/net/tun \
  --cap-add=MKNOD --cap-add=NET_ADMIN \
  -p 943:943 -p 1443:443 -p 1194:1194/udp \
  -v /var/lib/openvpn-as:/openvpn \
  openvpn/openvpn-as

sudo docker logs -f openvpn-as | grep "generated pass"

Auto-generated pass = "*********". Setting in db...
(more…)
23
01
25
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Migrating my Postfix configuration from Ubuntu 16.04 to Ubuntu 24.04

Posted by | Ubuntu | Tagged , |

I am not sure if I selected a right configuration, probably “No configuration” is better:

(more…)
23
01
25
 4 Comments

Configuring the access to GitHub with SSH

Posted by | Ubuntu | Tagged | 
ssh-keygen -t ed25519 -C "winappdev@gmail.com"
# /home/dmitriano/.ssh/id_rsa_github
# and empty passphrase
nano .ssh/config

Host github.com
 HostName github.com
 IdentityFile ~/.ssh/id_rsa_github

stat -c %a ~/.ssh/config
chmod 600 ~/.ssh/config
(more…)
23
01
25
 1 Comment

“ping: socket: Operation not permitted” error on a clean Ubuntu 24.04 installation

Posted by | Ubuntu |

ping did not work on my clean Ubuntu 24.04 installation showing the following error:

ping developernote.com

ping: socktype: SOCK_RAW
ping: socket: Operation not permitted
ping: => missing cap_net_raw+p capability or setuid?
(more…)
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