Nerveware

Network services on Linux
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Network services on Linux

Created by Bayou.

Network services

ISC dhcp server

Installation

$ apt install isc-dhcp-server
$ systemctl disbale isc-dhcp-server
$ echo 'INTERFACES="eth0"' >> /etc/default/isc-dhcp-server

/etc/dhcp/dhcpd.conf

default-lease-time 600;
max-lease-time 7200;
ddns-update-style none;

subnet 192.168.138.0 netmask 255.255.255.0 {
        range 192.168.138.10 192.168.138.254;
        option subnet-mask 255.255.255.0;
        option broadcast-address 192.168.138.255;
        option routers 192.168.138.1;
}

host some-node {
	 hardware ethernet 00:11:22:33:44:66;
	 fixed-address 192.168.138.9;
}

$ systemctl start isc-dhcp-server

View leases

$ dhcp-lease-list

TFTP server

Installation

$ apt-get install tftpd-hpa

/etc/default/tftpd-hpa

TFTP_USERNAME="tftp"
TFTP_DIRECTORY="/srv/tftp"
TFTP_ADDRESS="0.0.0.0:69"
TFTP_OPTIONS="--secure"

/etc/init.d/tftpd-hpa start

Download a file

$ tftp -g -r $file $ip

NFS

Installation

$ apt-get install nfs-kernel-server

/etc/exports

/srv/nfs *(rw,nohide,insecure,no_subtree_check,async,no_root_squash) exportfs -a

DNS

Writing in progress. Section might be incomplete

Installation

$ apt-get install bind9

/etc/bind/named.conf.default-zones

# Rest of file above..
zone "mywebsite.nl." {
        type master;
        file "/etc/bind/zones/db.mywebsite";
};

/etc/bind/zones/db.mywebsite

;
; BIND data file for local loopback interface
;
$TTL    604800
@       IN      SOA     mywebsite.nl. root.mywebsite.nl. (
                              2         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                         604800 )       ; Negative Cache TTL
;
@               IN      NS      mywebsite.nl.
@               IN      A       192.168.138.1
@               IN      AAAA    ::1
;mywebsite.nl  IN      MX      10 mail.

$ named-checkzone mywebsite.nl /etc/bind/zones/db.mywebsite
$ systemctl reload bind9

NTP

Client: Alter /usr/lib/ntp/ntp-systemd-wrapper to run ntpd -g to correct time regardless of the offset. If this doesn't fix it, place "ntpd -gq" before the exec (because whatever..).

server 192.168.138.9 prefer
driftfile /var/lib/ntp/ntp.drift
statsdir /var/log/ntpstats/

restrict 127.0.0.1
restrict ::1
disable auth
broadcastclient

Server:

server  127.127.1.0 # local clock
fudge   127.127.1.0 stratum 10

driftfile /var/lib/ntp/ntp.drift
logfile /var/log/ntp.log

restrict default kod nomodify notrap nopeer noquery limited
restrict -6 default kod nomodify notrap nopeer noquery limited

restrict 192.168.138.0 mask 255.255.255.0
restrict 127.0.0.1

Interfaces and other stuff

Tar through ssh

$ tar -czf - /srv/nfs/rootfs/ | ssh user@192.168.26.79 "tar -xzf - -C /srv/nfs/"

CAN interface

Enable CAN interface on 125kbp/s and generate data as ID a8 with data length 8.

$ ip link set can0 type can bitrate 125000
$ ip link set up can0
$ cangen can0 -I 0xa8 -L 8 -v

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