Well, I can only write from my own experience. I’ve worked for several major campaigns in my life. In banks, in telecom operators. And it’s almost always been like this. And where there was none, the campaign collapsed. Not in a moment, of course, because campaigns, like people, do not die instantly, but age and degrade. But as a result, it was.
nitrolife
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Cake day: June 28th, 2023
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The job of people around the CEO is primarily to make decisions. All this huge chain of managers is needed only to aggregate information so that the CEO can make an informed decision. This is how many large companies operate. I would even say that there is a direct correlation between the size of the campaign and the number of monitors at the bottom.
The flip side of sitting behind a huge monitor is that you won’t stay outside with a huge number of your employees if you make the wrong decision. It’s just a different job.
ISC DHCP switched to KEA DHCP, They don’t have package in Debian repo, but you can add repo and install: https://cloudsmith.io/~isc/repos/kea-3-0/packages/
ISC really deprecated… =( You can install dnsmasq of course, but he is much more slow. But nice for small networks.
Firewalld is much worse for small sustems. Who is really need mark ports? But in difficult cases you need write iptables rich rules anyway. So, as result I love old school with clean iptables without any upperlevel daemons.
Enable packet forwarding via interfaces:
# cat /etc/sysctl.d/01-forward.conf net.ipv4.ip_forward = 1 net.ipv6.conf.all.forwarding = 1 net.ipv6.conf.default.forwarding = 1Then install isc-dhcp-server and configure ipv4 and ipv6 dhcp server. (only on local ports or you internet prowider will be angry)
short example:
# cat /etc/dhcpd.conf ddns-update-style interim; ddns-updates on; ddns-domainname "my.local"; ddns-rev-domainname "in-addr.arpa"; allow client-updates; update-conflict-detection true; update-optimization true; authoritative; default-lease-time 86400; preferred-lifetime 80000; max-lease-time 86400; allow leasequery; option domain-name "my.local"; option domain-name-servers 192.168.1.1; lease-file-name "/var/lib/dhcp/dhcpd.leases";# cat /etc/dhcpd6.conf ddns-update-style interim; ddns-updates on; ddns-domainname "my.local"; ddns-rev-domainname "ip6.arpa"; allow client-updates; update-conflict-detection true; update-optimization true; authoritative; default-lease-time 86400; preferred-lifetime 80000; max-lease-time 86400; allow leasequery; option domain-name "my.local"; option dhcp6.name-servers fd00:1::1; option dhcp6.domain-search "my.local"; option dhcp6.preference 255; dhcpv6-lease-file-name "/var/lib/dhcp/dhcpd6.leases";don’t forget start dhcpd@lan and dhcpd6@lan
Then install radvd and configure RA ipv6 broadcasting. (only on local ports or you internet prowider will be angry)
# cat /etc/radvd.conf interface br0 { AdvSendAdvert on; MinRtrAdvInterval 3; MaxRtrAdvInterval 10; AdvDefaultPreference low; AdvHomeAgentFlag off; prefix fd00:1::/64 { AdvOnLink on; AdvAutonomous on; AdvRouterAddr off; }; RDNSS fd00:1::1 { AdvRDNSSLifetime 30; }; DNSSL my.local { AdvDNSSLLifetime 30; }; };Then install iptables-persistent and configure ipv4 and ipv6 rules in /etc/iptables/ . Change lan and internet to you real interfaces.
# cat /etc/iptables/rules.v4 # Generated by iptables-save v1.6.1 on Mon Dec 30 18:53:43 2019 *nat :PREROUTING ACCEPT [0:0] :INPUT ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -A POSTROUTING -o internet -j MASQUERADE COMMIT # Completed on Mon Dec 30 18:53:43 2019 *filter :INPUT DROP [0:0] :FORWARD DROP [0:0] :OUTPUT ACCEPT [0:0] #UNBRICK IF YOU WANT ACCESS FROM INTERNET -A INPUT -s x.x.x.x -j ACCEPT -A INPUT -s y.y.y.y -j ACCEPT #BASE -A INPUT -i lo -j ACCEPT -A INPUT -i lan -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A FORWARD -i lan -j ACCEPT -A FORWARD -p icmp -j ACCEPT -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT COMMIT# cat /etc/iptables/rules.v6 # Generated by ip6tables-save v1.6.0 on Thu Sep 8 13:29:11 2016 *nat :PREROUTING ACCEPT [0:0] :INPUT ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -A POSTROUTING -o internet -j MASQUERADE COMMIT *filter :INPUT DROP [0:0] :FORWARD DROP [0:0] :OUTPUT ACCEPT [0:0] #BASE INPUT -A INPUT -i lo -j ACCEPT -A INPUT -i lan -j ACCEPT -A INPUT -p ipv6-icmp -j ACCEPT -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A FORWARD -i lan -j ACCEPT -A FORWARD -p ipv6-icmp -j ACCEPT -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT COMMITThen install dns relay. I user bind, but that some overkill. But anyway:
install named / bind9
# cat /etc/named.conf ... acl "lan" { 192.168.1.0/24; 127.0.0.1; fd00:1::/64; ::1/128; }; tls google-DoT { ca-file "/var/named/google.crt"; //SET google cert path here remote-hostname "dns.google"; }; tls local-cert { //if you want local SSL requests cert-file "/etc/letsencrypt/live/local/cert.pem"; key-file "/etc/letsencrypt/live/local/privkey.pem"; }; options { directory "/var/named"; pid-file "/run/named/named.pid"; forwarders port 853 tls google-DoT { 8.8.8.8; 8.8.4.4; }; // Uncomment these to enable IPv6 connections support // IPv4 will still work: //listen-on-v6 { any; }; // Add this for no IPv4: //listen-on { any; }; listen-on-v6 { fd00:1::1; ::1; }; listen-on { 192.168.1.1; 127.0.0.1; }; listen-on-v6 tls local-cert { fd00:1::1; ::1; }; //if you want local SSL requests listen-on tls local-cert { 192.168.1.1; 127.0.0.1; }; //if you want local SSL requests allow-recursion { lan; }; allow-recursion-on { 192.168.1.1; fd00:1::1; 127.0.0.1; ::1; }; allow-transfer { none; }; allow-update { none; }; allow-query { lan; }; allow-query-cache { lan; }; allow-query-cache-on { 192.168.1.1; fd00:1::1; 127.0.0.1; ::1; }; version "DNS Server 1"; hostname "interesting server"; server-id "realy interesting server"; dnssec-validation auto; empty-zones-enable no; minimal-responses yes; http-port 8888; listen-on http local tls none { any; }; listen-on-v6 http local tls none { any; }; auth-nxdomain no; # conform to RFC1035 }; ...All done.
21·13 days agoarchlinux + podman / libvirtd + nomad (libvirt and docker plugins) + ansible / terraform + vault / consul sometimes
UPD:
archlinux - base os. You never need change major version and that is great. I update core systems every weekend.
podman / libvirtd - 2 types of core abstractions. podman - docker containers management, libvirtd - VM management.
nomad - Hashicorp orcestrator. You can run exec, java application, container or virtual machine on one way with that. Can integrate with podman and libvirtd.
ansible - VM configuration playbooks + core system updates
terraform - engine for deploy nomad jobs (docker containers. VMs. execs or something else)
Vault - K/V storage. I save here secrets for containers and VMs
consul - service networking solution if you need realy hard network layer
As a result, I’m not really sure if it’s a simple level or a complex one, but it’s very flexible and convenient for me.
UPD2: As a result, I described the applications level, but in fact it is 1 very thick server on AMD Epic with archlinux. XD By the way, the lemmy node from which I write is just on it. =) And yes, it’s still selfhosted.
The only way to connect the SIM number directly is to hack the VoWiFi protocol, but this is not trivial and you still need to install the SIM in the server.
Option 2 - Buy a home SIP2GSM gateway. But it’s quite expensive (by the standards of my region anyway). SMS work with SMPP, calls work too. For goIP I wrote telegram SMS gateway if you interesting: https://github.com/lifespirit/telegram-smpp-bot
Or use SIP providers from your region/operators that support SIP connectivity and then enable full calls redirection. For calls ok.
UPD: or just use VoWiFi from mobile phone. But you need sim slot in phone.
Anyway in all another way you need install asterisk/freeswitch and write config fot it. And linphone client.
Yes. Sorry, I still don’t speak English well, so I use Google Translate.