Network Services Configuration Module

The Network Services configuration module implements DNS and Syslog clients and servers; NTP and SNMP are planned for future releases.

Platform Support

netlab can configure DNS clients or servers on these platforms:

Device	IPv4 DNS client	IPv6 DNS client	Transport VRF	DNS server
Arista EOS	✅	✅	✅	❌
Aruba AOS-CX	✅	✅	❌	❌
BIRD	✅	✅	❌	❌
Cisco IOS[*1]	✅	✅	✅	❌
Cisco IOS XR[*2]	✅	✅	❌	❌
Cisco IOSv layer-2 image	✅	✅	❌	❌
Cisco Nexus OS	✅	✅	✅	❌
dnsmasq	✅	✅	❌	✅
FRRouting (containers)	✅	✅	❌	❌
Junos[*3]	✅	✅	❌	❌
KinD cluster	✅	✅	❌	❌
Linux (containers)	✅	✅	❌	❌
Nokia SR Linux	✅	✅	❌	❌

[*1]

Includes Cisco Catalyst 8000v, Cisco CSR 1000v, Cisco IOL, Cisco IOL layer-2 image, Cisco IOSv, but not Cisco IOSv layer-2 image

[*2]

Includes Cisco 8000v, Cisco IOS XRv/XRd

[*3]

Includes Juniper vJunos-router, vJunos Switch, Juniper vMX container, Juniper vPTX, Juniper vSRX 3.0

Syslog is supported on these platforms:

Device	Syslog client	Transport VRF	Syslog server
Arista EOS	✅	✅	❌
Aruba AOS-CX	✅	✅	❌
Cisco IOS[*1]	✅	✅	❌
dnsmasq	❌	❌	✅

[*1]

Includes Cisco Catalyst 8000v, Cisco CSR 1000v, Cisco IOL, Cisco IOL layer-2 image, Cisco IOSv, Cisco IOSv layer-2 image

Common Network Services Parameters

You can configure the services (DNS, Syslog) clients with the global/node services.service dictionary, which can contain these parameters:

• server (node name or list of node names): Specifies the DNS/Syslog server(s) node name. The node name(s) are resolved to IPv4/IPv6 addresses, which are then used to configure the lab devices.

• ipv4 and ipv6 (address or list of addresses): Hard-coded IPv4/IPv6 server addresses.

• transport_vrf: the VRF used to reach the DNS/Syslog server.

Warning

Configuring module: [ services ] and services.dns.server at the lab topology level is not enough to run DNS clients on all host nodes. Hosts do not inherit topology-level modules; you must configure the services module on hosts (preferably within a group).

DNS-Specific Parameters

• Specify the DNS server(s) on the DNS clients with the services.dns common network services parameters.

• The services.dns.domain (string) global/node parameter sets the lab DNS domain (default: netlab.local)

The DNS server is enabled on supported nodes with the services.server.dns parameter, which can be a boolean value or a dictionary with these parameters:

• forwarder.ipv4 and forwarder.ipv6 (address or list of addresses): upstream DNS servers used for name resolution of domains other than services.dns.domain.

Syslog Parameters

• Specify the Syslog server(s) on client nodes with the common network services parameters

• The syslog server is enabled on supported nodes with the services.server.syslog: True parameter.