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Questions tagged [ospf]

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

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Packets generated by C program cannot reach router in GNS3

I'm using a C program to send OSPF packets over to a router in GNS3. I'm using a socket raw to communicate with the router. The problme I'm having is, even though I can receive the packets generated by the router, the packets my program sends, do…
fernandonos
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name 'OSPF_Link' is not defined

I have a python script like this: #!/usr/bin/env python from scapy.all import * from ospf import * def ourSend(packet): sendp(packet,iface='eth1') host1='10.0.3.2' advr_routers='10.0.8.7' host2='10.0.2.2' sequence=0x80000918 …
MLSC
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how to implement OSPF using Ns-2

I am new in this field.Please help me to implement open shortest path first(OSPF) in ns2.
martin552
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How to redistribute connected /32 with quagga ospfd?

I have a VM host which acts as a quagga router. It announces routes to its hosted VM's (I don't use bridges, only routed VM's) It works well when tun interface is configured with a /30 ; for example : $ ip a 4: gentoo:…
Bastien Durel
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Configuring multiple FastEthernet interfaces using GNS3

I'm doing a lab for my internetworking course and I'm using GNS3 as the emulator. I can configure single FastEthernet interfaces on each router but I need to have two per router. I am using the c7200 image and router. This is my attempt to configure…
shans91
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OSPF Convergence

Network convergence as the process of synchronizing network forwarding tables after a topology change.Please can some explain clearly what are the steps in OSPF Convergence and how is it better than RIP Convergence ?
Amol Sharma
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Where are the Designated Router in this picture?

I have the following network diagram and I want to know which interface on every router is the Designated Router? I got the message that Router1 on interface 192.168.4.1 is the Designated Router but I do not know why? Router1 does not have any…
Bernd
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OSPF stopped in Exstart state - Port channel

2 nodes are connected using port channel. Initially OSPF settled in two nodes. When I shut and no shut the port channel interface, OSPF in 1st node is stuck in EXSTART state. In 2 nd node, OSPF is in FULL state because it started receiving hello…
Kalai
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Redistributing Connected Routes into an OSPF Instance on a Nexus 7010

So, I'm trying to redistribute six routes into OSPF with the default type and metric, but I seem to be having a good deal of trouble figuring this out. I have done extensive research, but am still struggling. My situation is as follows: Router B is…
Evan Sanderson
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How to apply the OSPF patch to ns2 2.35 on ubuntu 14.04

I have been using ns2 and nam for a long time on my ubuntu. Now I have to apply a patch (OSPF) to it. I have been searching for how to apply a patch in linux (as I'm kind of new in it) and all I got was: 1) $ tar xvf ns-allinone-2.35.tar.gz 2) $ cd…
Raein Hashemi
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OSPF - Checksum not working

I'm working on a project on which I need to generate the OSPF packet manually. I am currently having problems getting the OSPF checksum right. I read that I have to keep the Auth data out of the calculation, and even though I'm doing that I can't…
fernandonos
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DMVPN and OSPF through GRE tunnels

please help me to resolve the problem with routing between dmvpn GRE tunnels. I've got a DMVPN HUB and SPOKE topology. HUB has public ip address in internet. SPOKE has two ISPs for redundancy. I've decided to create two GRE tunnels between HUB and…
HFFreeway
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Effect of DR failure on data traffic in OSPF

I read somewhere that the forwarding of data traffic is interrupted when the DR of an OSPF network fails. Why is this so? As per my understanding, the network LSA originated by the DR is still present in the AS, and that would describe the routers…
user1510194
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M/S determination during OSPF database exchange

As per the OSPF RFC 2328, Master/Slave determination during state ExStart of the neighbor state machine uses the Router ID to determine who becomes master and who becomes slave for the Database Exchange process. What I fail to understand (and cannot…
user1510194
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PPP Network Detection for OSPF Demand Circuit Validation

I am looking for a way to detect if any incoming or outgoing network traffic is PPP (Point to Point). Is there a way that I can sniff for this type of traffic using the pcap library? The reason I need to know if the traffic is PPP to validate a…
THE DOCTOR
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