glen.turner at aarnet.edu.au
Thu Nov 18 03:43:19 UTC 1999
Barry Margolin wrote:
> There's no problem with having sub as a CNAME. It's a subdomain, but it's
> *not* a subzone, so it doesn't violate the rule against CNAME and other
> data. We do this extensively for the domain that contains all our routers;
> we have A records for each interface, and then a CNAME record for the
> router's name with no interface prefix:
We use the router's loopback interface address as the name
of the router. Cisco lets you set the source address or
router orginated packets to the loopback interface.
This has three nice effects:
- you don't hit resolver library limits on routers
with hundreds of interfaces (VLANs make this really
easy to do).
- syslog and SNMP records are consistently stamped
no matter what the network topology.
- puting all the loopback interfaces into one IP address
range makes verification of source addresses for
routing updates and the like very simple and
consistent across all routers.
If possible, make the loopback interfaces use the highest
addresses as the highest address in the system is often used
as the router ID by default by various routing protocols.
vlan0002 IN A ....
vlan0034 IN A ....
adelaide5sa IN A ....
Glen Turner Network Engineer
(08) 8303 3936 Australian Academic and Research Network
glen.turner at aarnet.edu.au http://www.aarnet.edu.au/
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