Stack Overflow
Stack Overflow

Questions tagged [ospf]

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

44 questions
4
votes
1 answer

Omnet++ OSPF Routing table metric

Question 1: I implemented ospf protocol in Omnet++. According to the topology, r1 can reach two different ways to r3 .I have set the upper path metric to 1 and lower path to 10. However, according to the OSPF protocol, it should not select the lower…
melek_3
  • 97
  • 11
2
votes
0 answers

How to know from which interface did I received the multicast packet?

I have one socket that is waiting for OSPF Hello packets (224.0.0.5) on the different interfaces of my machine, except loopback interface. At this point, I receive multicast OSPF packets from two different interfaces on the same socket. class…
André Pires
  • 71
  • 4
2
votes
2 answers

Why is in OSPF LSA sequence nuber in range 0x80000001 to 0x7FFFFFFF

Why is in OSPF LSA sequence number in range 0x80000001 to 0x7FFFFFFF. I suppose that it is for some historical reasons but cannot google it.
Jan Pluskal
  • 103
  • 5
1
vote
2 answers

Compare Quagga to XORP

What do you think of Quagga compared to XORP as a dynamic software routing engine? What are the technical merits of each engine comparatively? Additionally, what do most people think of them from a programming view. Who has manipulated networks…
Sargun Dhillon
  • 1,688
  • 2
  • 18
  • 23
1
vote
1 answer

Why cant Routing Information Protocol RIP (distance-vector routing protocol) use Dijkstra instead of bellman ford?

Hello I am learning networking and am confused about why both the interior routing protocols (RIP and OSPF) use the same algorithm to calculate the shortest path? I think I understand how they differ (RIP and OSPF) but am not clear on using a…
Digdarshan Kunwar
  • 21
  • 2
1
vote
1 answer

OSPF unnumbered No ping between Switch and Vm possible

I am trying OSPF Unnumberd and i have a VM (CentOs) and a Switch (Cumulus-Vx). When i try to ping from the Switch interface 1 to the Vm the Vm-Interface recieves the ICMP echo request but doesnt answer. When i look into the forward routing table i…
John Carr
  • 207
  • 1
  • 12
1
vote
1 answer

How to sniff ospf packet in windows10 in python3.5 with raw packet

I'm trying to sniff ospf packet in Python, and have achieve this aim in ubuntu. When it comes to windows, I could only sniff TCP, UDP and IGMP packets.I can capture ospf packets by wireshark. The code is below. from socket import * import…
Wolf.W
  • 21
  • 4
1
vote
0 answers

Getting Link State ID from Network LSA Pyshark

I am trying to retrieve the Link State ID of a Network-LSA from a captured OSPF LS Update in Wireshark. Wireshark says the variable is ospf.lsa_id, however this gives only the first instance of the ospf.lsa_id which is in the router-lsa part of the…
natzberg
  • 31
  • 5
1
vote
1 answer

Calculate LSA checksum in OSPF

I have been trying to calculate the LSA checksum for an OSPF packet without success. I read the ospf's RFC and says there that you need to use the Fletcher algorithm. I tried to it but it still doesnt give the right answer. My code: Void…
user3206874
  • 515
  • 2
  • 5
  • 14
1
vote
1 answer

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
  • 563
  • 4
  • 18
0
votes
0 answers

I can't pingall in the same subnet using Quagga-Mininet on Ubuntu

I have a problem with pinging my network topology which is as follows(H --> Hosts and R --> Routers): Basically I would like to make all my pingall network in the same subnet (10.0.1.X) but using Quagga-Mininet I can't ... my interface…
Luca Lazzati
  • 65
  • 1
  • 9
0
votes
0 answers

What are the pros and cons of using CSPF vs OSPF?

When using RSVP with a CSPF algorithm on a MPLS System, what are the pro's and con's verses using OSPF algorithm instead?
I Smokh I
  • 71
  • 7
0
votes
2 answers

How activate OSPF in a router Cisco-IOS-XE using RESTCONF?

I'm trying to activate OSPF routing protocol in a router using a python script with restconf. I send the request to this url https://(router ip)/restconf/data/Cisco-IOS-XE-ospf-native-router:10 but i get this return message: { …
lost on internet
  • 1
  • 1
0
votes
1 answer

OSPF area topology

While reading about OSPF, I stumbled upon the following text: An OSPF area hides the topology from another area but allows for the networks to be visible in other areas within the OSPF domain. If a topology change occurs (link flap or additional…
Tarun
  • 2,917
  • 2
  • 24
  • 40
0
votes
1 answer

about ibgp config and ping Time exceeded: Hop limit

I am configuring iBGP Now there are two machines RS1 and RS2 They use Ubuntu 18 and bird 1.6 RS1 connected to as6939 RS2 connected to as20473 2000:1::/48 Announced on RS1 2000:2:: 48 Announced on RS2 RS1 and RS2 are connected through zerotier, and…
kagurazaka shira
  • 23
  • 5
1
2 3