OSPF (Open Shortest Path First) is a link state routing protocol for interior routing within single autonomous system (AS).

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How to find which routing protocol a router is using. And if found how to test it

I was recently asked a networking question in an interview which I did answer but the interviewer was not pleased. The question was : "Given an actively running router, how would you know what ...
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307 views

Quagga, OSPF, announcing inactive tunnel

I have a 3 node network with OSPF Quagga running on each of them. Each node connected with p2p, OpenVPN: http://vetal.ca/Download/img/Network_loop.png (Will embed picture here when have reputation > ...
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228 views

EIGRP Neighbor State

I understand that OSPF has states that describe the status of a neighbor (e.g. Init and Full). Does EIGRP also have similar information? I'm programmatically trying to get the status of an EIGRP ...
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422 views

How to configure machines in a public subnet with two gateways?

We have a single public /24 subnet, with a BGP router as the primary gateway. Now I'm interested in configuring a second router for redundancy. How do I deal with multiple gateways on the servers in ...
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174 views

Filter OSPF routes redistributed by BGP

I am redistributing OSPF routes inside a network, through BGP. However I don't want to redistribute all the advertised routes from OSPF (specificaly the private networks) to the outside of the AS. How ...
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65 views

Reachability with OSPF on firewalled network

I'm trying to figure out how OSPF establishes routes when used on a network with firewalls. Say I have four routers (A, B, C, and D) and two firewalls (F1 and F2), arranged like so: (LocalA) A - F1 -...
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SPF Error with redirection

so I have this crazy SPF-Policy problem which looks like that: I have a private domain like 'my-private-domain.com'. This one I'm hosting myself on a vServer and I activated SPF and added the SPF ...
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ping between ipv6 and ipv4 networks

I have 2 networks (one ipv4 and one ipv6) , I used ospf as routing protocol for both networks. I activate bgp between this 2 networks(R6 and R1) and now R6 can ping the full ipv6 network and R1 can ...
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Cannot ping an ip of router

my issue is: r1 ping r4(em0) will lost the first packet r2 ping r3(em0) will lost the first packet too r3 cannot ping r2(eth0) r4 cannot ping r1(eth0) there are 4 routers, and connected with ...
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internet access for system over multiple hops of ipsec using GRE and OSPF

I have the following setup: linux client @ 172.16.10.68 linux gateway @ 172.16.10.69, ipsec tunnel to aws box #1, gre tunnel 10.254.0.0/30 aws box #1, ipsec tunnel from linux gw, ipsec tunnel to ...
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Routing Issue - can't ping gateway from other routers in full mesh

I am setting up a new network. I have 4 routers in a full mesh. Edge1, Edge2, Client1, Client2. This are Mikrotik Cloud Core Routers (not that it matters). They are set up with OSPF (distributing ...
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ospf hello not forwarded

I am trying to change the destination ip of ospf hello packet (224.0.0.5) to link local address using iptables rule (DNAT) . It does not seem to work. A similar rule for unicast packet (BGP control) ...
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99 views

OSPF on XEN host running several VMs

Is it possible to set OSPFs areas in a XEN environment to setup a virtual cluster? Main intention is to avoid a external router since all VMs will run inside the same machine.
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Quagga ospf6d not advertising networks

I have a correctly functioning network, with OSPFv3 running between some Mikrotik routers and some layer 3 switches. I need to add a Linux based router into this network, and so have installed Quagga ...
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29 views

Quagga OSPF not updating

TL;DR: routing daemon not updating tables. Help! Consider two different Linux vm's configured for routing, R1 and R2, which are directly connected on 10.0.0.0/24. Each has other networks on their ...
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126 views

How would you use OSPF with Azure and a router through VPN?

I have a router that is connected to my Azure virtual network. I can pass traffic back and forth, but it's tiresome creating static routes to manage data flow. I've read that if you are using a ...
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view the maximum equal cost paths configured for OSPF

How do you check if the maximum number of equal cost paths has been modified (with the (config-router)# maximum-paths command)? Is the only way by viewing the running configuration? show ip ospf ...
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Need advice on Juniper OSPF networking

I have been thrown in to this project because of a coworker's termination. I have a set of Juniper SRX 550 Routers. I need to create an OSPF network that passes all traffic (All subnets) as if it ...