Hello,
Very nice piece of software - most useful network monitoring tool I have seen in the open-source world.
I have a question on the Netmap tool - I'm trying to have external links show and I wasn't able to. The scenarios are:
- Edge router connected to the ISP. I can't add the ISP as a netbox as I don't have SNMP query access. So I added it as a server. How can I show on Netmap the edge router, the ISP end-device with a link between the two so I can see the bandwidth utilization and status?
- A similar scenario, but with VPNs. I have a VPN router with multiple Tunnel interfaces (Csico) establishing a VPN with remote offices. I don't have SNMP of the remote offices' routers. How can I show this in Netmap tool - showing my VPN router with links to remove devices.
I was able to do a similar thing with computers plugged into my switches, but in this case, I guess NAV uses the MAC address to match the device (in this case environment monitoring) with the switch port.
Thank you.
Etienne
On Fri, 29 Jul 2016 01:12:18 +0200 etiennel@cos.flag.org wrote:
Hello,
Very nice piece of software - most useful network monitoring tool I have seen in the open-source world.
Thank you, Etienne,
apologies for the terribly late answer. Your posting came during our typically long Norwegian summer vacation, and it got kind of buried after that.
I have a question on the Netmap tool - I'm trying to have external links show and I wasn't able to. The scenarios are:
- Edge router connected to the ISP. I can't add the ISP as a netbox
as I don't have SNMP query access. So I added it as a server. How can I show on Netmap the edge router, the ISP end-device with a link between the two so I can see the bandwidth utilization and status?
You do not usually need to add external peers to do this. All you need to ensure is that the link subnet the two routers are using to exchange traffic is correctly categorized as an `elink` network by NAV. `ELINK` is provided as a separate category of device to view in the Netmap view options (provided, of course, that you are viewing a layer 3 network in Netmap).
Any IPv4 prefix with a netmask of /30 or /31 and only a single router seen by NAV will be categorized as elink. You should also be able to force a network type using the conventions described in [1].
- A similar scenario, but with VPNs. I have a VPN router with
multiple Tunnel interfaces (Csico) establishing a VPN with remote offices. I don't have SNMP of the remote offices' routers. How can I show this in Netmap tool - showing my VPN router with links to remove devices.
Again, as long as the VPN tunnel prefixes are recognizable as elinks by NAV, you should be able to see them in the Netmap.
I was able to do a similar thing with computers plugged into my switches, but in this case, I guess NAV uses the MAC address to match the device (in this case environment monitoring) with the switch port.
Yes, your intuition to add the peer device to NAV (actually, OTHER would be better than SRV in this case), isn't bad. But you will likely only discover a L2 connection based on either MAC, LLDP (or CDP), not a proper L3 connection.
I tried to do some experiments with this just now, but it turns out there were other problems with our network that prevented me from completing it before needing to leave the office. If you have a response to the above ideas, I can try to look at it again.
[1] https://nav.uninett.no/wiki/subnetsandvlans
Thank you for answering! And I took a while too but was able to look at it today...
Doh! ..."provided, of course, that you are viewing a layer 3 network in Netmap". How silly of me! I was only looking at Layer 2!
Great work!
Etienne
On 9/1/2016 8:04 AM, Morten Brekkevold wrote:
On Fri, 29 Jul 2016 01:12:18 +0200 etiennel@cos.flag.org wrote:
Hello,
Very nice piece of software - most useful network monitoring tool I have seen in the open-source world.
Thank you, Etienne,
apologies for the terribly late answer. Your posting came during our typically long Norwegian summer vacation, and it got kind of buried after that.
I have a question on the Netmap tool - I'm trying to have external links show and I wasn't able to. The scenarios are:
- Edge router connected to the ISP. I can't add the ISP as a netbox
as I don't have SNMP query access. So I added it as a server. How can I show on Netmap the edge router, the ISP end-device with a link between the two so I can see the bandwidth utilization and status?
You do not usually need to add external peers to do this. All you need to ensure is that the link subnet the two routers are using to exchange traffic is correctly categorized as an `elink` network by NAV. `ELINK` is provided as a separate category of device to view in the Netmap view options (provided, of course, that you are viewing a layer 3 network in Netmap).
Any IPv4 prefix with a netmask of /30 or /31 and only a single router seen by NAV will be categorized as elink. You should also be able to force a network type using the conventions described in [1].
- A similar scenario, but with VPNs. I have a VPN router with
multiple Tunnel interfaces (Csico) establishing a VPN with remote offices. I don't have SNMP of the remote offices' routers. How can I show this in Netmap tool - showing my VPN router with links to remove devices.
Again, as long as the VPN tunnel prefixes are recognizable as elinks by NAV, you should be able to see them in the Netmap.
I was able to do a similar thing with computers plugged into my switches, but in this case, I guess NAV uses the MAC address to match the device (in this case environment monitoring) with the switch port.
Yes, your intuition to add the peer device to NAV (actually, OTHER would be better than SRV in this case), isn't bad. But you will likely only discover a L2 connection based on either MAC, LLDP (or CDP), not a proper L3 connection.
I tried to do some experiments with this just now, but it turns out there were other problems with our network that prevented me from completing it before needing to leave the office. If you have a response to the above ideas, I can try to look at it again.
-
Etienne Lacombe -
etiennel＠cos.flag.org
-
Morten Brekkevold