Questions tagged [routing]

For questions about routing, the process of selecting to which network path traffic is sent. Consider using a more specific tag if your question is about a routing protocol like BGP or OSPF.

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What are the IP/MAC addresses of requests between 2 different subnets? [closed]

Assume that networks 172.15.10.0/24 and 172.15.11.0/24 are connected through a router with interfaces 172.15.10.254 (MAC3) and 172.15.11.253 (MAC4). If host A sends a packet through its network ...
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Can't connect two routers rip ipv6 [closed]

I have two routers, they must be in RIP ipv6. I did the following configurations on router 0: And on router 1: But still I can't send ping even between routers. What am I doing wrong?
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Access IP address from another IP range and subnet [closed]

I have a networking question which I assume is possible to do, but I have no idea how to do it! I have two ethernet connections into my Windows machine (no WAN, all local LAN): (IP / MASK / GATEWAY) #...
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Reasons for tcp session break and how to check? [closed]

In advance, I would like to thank you for taking the time to read it. I need the experience of colleagues. I'm having a problem with broken TCP segmentation and would like to find the reasons that ...
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How do devices open port forwarding autonomously? [closed]

I know how I can log into my router and open a port for forwarding with rule for a device. However when I log into my router and go to port forwarding, I see what essentially look like the rules that ...
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Why iBGP speaker should not modify next hop address?

I understand the concept of "Split Horizon" that an iBGP router A learns an external route from an iBGP router B, thereafter, iBGP router B will not advertise the same route to other iBGP ...
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7 votes
3 answers
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Can I announce the same block of /24 given to me by ARIN at two different locations?

The setting: Two locations I'm trying to connect. I have a /24 address block from ARIN Both location have the Same ISP. The Question: Can I announce the same /24 address block at the HQ location to ...
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How to configure a layer 3 switch for routing vlans?

I have set up the router as a dhcp server and I would like to use the layer 3 switch to route each PC in seperate vlans. How do I configure the router and L3 switch for inter vlan routing ? the router ...
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Cisco EFP point-to-point -- How to see MAC addresses

I see on cisco ME3600x and I read in documentation as below, that "the MAC learning is not supported in point–to–point bridge domains" Table 1 MAC Learning Actions Scenario Action A bridge ...
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VLAN routing on the same subnet

Consider following situation: You have 10.3.0.0/16 network without any VLANs. Now You want to divide it... You want Your IT department be able to reach the entire network, but sales department only ...
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How does a host (HOST_A) on LAN1 send a packet to a a network more than 1 hop away and how does a router (ROUTERX) handle that packet?

Suppose there is a host, HOST_A, on LAN1 and is sending a packet. The destination address of that packet is: 10.10.11.77 HOST_A will refer to it's routing table and see that that there is no entry for ...
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Ospf multicasting with two different group

Suppose I have one ospf network where two multicast group exists. And some routers is ospf which belongs to one group or multiple group (Like: routers E, H) and router is layer3 router (Like: ...
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4 votes
1 answer
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How Can a VPC ping the Router through an Etherswitch that behaves in one port as router and in the other as switch

In the following topology my main purpose is to: 1)PC11 ping Router(R) 2)PC11 ping PC13 ESW10: In gig0/3 has the no switchport command and a given IP address. In gig0/2 it has the switchport access ...
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2 votes
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CCNA | OSPF | What differences can exist between two processes of a single routing protocol?

It is my understanding that a process is a specific-instance of a routing protocol. The process-id is a symbolic representation of a unique instance of that RP within a router. If that's the case, ...
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Can Loopback IP be Public

I have a Usecase where an Access Device need to reach a Core Device over the Internet. Access Device is configured with the Public IP of the Core device as of now so that it can reach the Core over ...
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Can an application on two separate devices share a packet to similar resource?

Can packets requested for an image by an app on a phone be sent to same app on another phone by another user?
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Connecting geographically distinct sites using a WAN

I am studying for my CCNA and my current topic is related to WANs, and I need some clarity on certain things. Here is a topology I've quickly built. (Don't mind the IP addressing, I've have purposely ...
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Why can't I ping from a pc in one OSPF area to a pc in another OSPF area after configuring each neighbouring network?

So I have an exercise with this topology: I have configured all the OSPF networks on each router and I made every g0/0 interface (except for the ABR in the middle) a passive interface. However, I ...
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How to reset a Default username and password of Allied Telesis AT9000/28 switch using CLI? [duplicate]

How to reset a Default username and password of Allied Telesis AT9000/28 switch using CLI?
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Actually ICMP message makes layer3 reliable?

We know that ICMP is connectionless because it does not require hosts to handshake before establishing a connection. But when packets gets dropped in between route then respective router informs the ...
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1 answer
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Routing for same subnets in remote sites

Is it possible to have interVLAN routing with router on a stick topology, but with remote sites communicating via OSPF? In the diagram below, I can ping PC1 from PC0. What I want is to ping PC2 and ...
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Same subnet on multiple VPN clients

I have an openVPN server, where multiple clients are connected. These clients are usually routers, so they have a subnet behind these routers. I want to access all clients on these subnets if I ...
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2 votes
1 answer
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Static route removes another static route

In the following diagram each Vyos router has RIP configure and R1 has NAT to allow hosts from 10.0.0.0/24 and 192.168.10.0/24 accessing the internet. The goal is to put the PCs comunicating with each ...
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2 votes
1 answer
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When using link state routing algorithm, does each router have a map of the other routers?

I think when using dijsktra algorithm, each router's shortest-path tree can be different. And in link-state routing, all routers have the same topology of the total network. Therefore, does each ...
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6 votes
5 answers
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Dividing a network into subnets using a router

I am learning about how L3 and IPv4 addressing works and I need some clarity on certain things. I've encountered the following topology So in this topology, the router stands in the center and ...
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3 votes
2 answers
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Time taken to complete a routing table update and possible interruption

I am wondering if a routing/forwarding table update at a switching node (e.x., a switch or layer-3 router) can cause momentary packet drop or increased delay for a data stream that will traverse this ...
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Physical interface on Cisco Router not forwarding to BDI interface

I think I've outlined the basic interface setup accurately in the diagram. What I'm trying to do is to run a server on my laptop connected to R2 that is IP'd in the same net as an out of band network (...
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2 answers
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Create routing between non-VLAN router and HP 2848 Procurve

I am trying to create this routing but getting some issues(or not having the routing). Scenario: simple router: 192.168.1.254 (with DHCP server for all network that is providing wifi and internet to ...
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Why Poison Reverse is used in EIGRP routing protocol?

EIGRP uses DUAL to achieve route-loop freedom. By design DUAL ensure no route-loop in the network. Then why does EIGRP use poison reverse UPDATE when there is a topology change? Is there any other ...
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1 vote
1 answer
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Does a Transparent Firewall need a Default gateway if directly connected to a layer 3 device that is actively performing routing?

Good folks of the Network Engineering stack! I have a question that I assume most people could answer in their sleep. To better illustrate my question, I've provided a sketch of my network below. In ...
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1 vote
3 answers
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Longest Prefix Matching

I just learnt about this concept and I have a query which was also asked by someone earlier but was grossly misinterpreted. Suppose my Router has Routes for Networks: 192.168.22.0/23 and 192.168.22.0/...
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Will a host accept a packet (not ARP) that is layer 2 broadcasted from an unknown MAC Address and its destination IP is the one of the host?

In case this is a yes why cant we connect 2 Lans with a hub or a switch. Let me elaborate, we have subnet A and subnet B, completely differents IPs, all hosts (of B and A) are wired directly to one ...
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What would happen if BGP identifier field of both the routers are identical

Say we have two routers R1 and R2. R1 has a router id configured as 1.1.1.1 R2 also has the same router id configured i.e. 1.1.1.1 R1 and R2 are connected to each other via a P2P link. This has an ...
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Which route does a cisco router prefer and why? [duplicate]

I have a small network i packet tracer whith some subnets. I connected the subnets with static routes. In one case I made two routes two the same subnets, but one is a serial connection. I wonder ...
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1 vote
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How to view or change OSPF LSA max-age time in Cisco IOS?

Is there any way of viewing or changing OSPF LSA Max-Age time in Cisco IOS?
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4 votes
2 answers
233 views

Passive interface default - issue

I was trying to configure ospf router, I have a router connected to FW in G1/0/10 and mpls router connected g1/0/1, when i typed passive interface default in the ospf router i lost all connectivity ...
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2 answers
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Juniper EX Switch as router with transfer network for upstream network

So im new at juniper and networking. On my Juniper EX4550 switch i want to setup a transfer network to my upstream provider. So my upstream provider assigned a /30 subnet for the transfer network: ...
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3 votes
1 answer
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Juniper SRX 340 route lookup failed

I've a strange issue on my Juniper; I've a policy to allow all traffic to a specific address behind it and, in effect, the policy works correctly. All the traffic I send reach the destination, except ...
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4 answers
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How does DHCP work?

I'm carrying out an experiment to test the mechanism behind DHCP. In this topology, I disable the link between the switch and the router. However, the computer still request IP address successfully. ...
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2 votes
1 answer
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Will 2 redundant Routers configured with HSRP consume 3 IP Adresses in each Subnet?

The Problem occured while studying for my exams Problem: I have to design a Network for a Company. The given IP Adress Space is 192.168.1.0/24 which has to be divided into 4 Subnets. These Subnets ...
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1 vote
0 answers
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Logs on my Cisco ASA show the public gateway (ISP router) is pinging the internal network, how? [closed]

Im (remotely) working with an issue where the network has intermittent drops. i suspect possible routing loop, but havent confirmed that yet. In the logs of our Cisco ASA 5506, i see that the public ...
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2 votes
2 answers
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IPv6 link-local address

Can somebody explain why we can assign link-local address FE80::1 to both interfaces? What does it give to me ? R1(config)# interface g0/0 R1(config-if)# ipv6 address fe80::1 link-local R1(config-if)# ...
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0 votes
3 answers
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Routing traffic within the subnet - How to decide CIDR range?

I am following this tutorial to configure multiple subnets and firewall: https://networkfirewall.workshop.aws/setup/distributedmodel.html This tutorial shows how to filter traffic through the ...
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3 answers
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One Missed Point in Data Link Layer Concept?

I see one Course Lecture as follows: I trouble in understanding "source address for the next node’s reply", What is the meaning of next node's reply?
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2 answers
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How does a border router work

Supposing, we have following pieces in a theoretical network architecture Network A: A low power IPV6 wireless network Some low power hosts: Low power devices which are connected to the above low ...
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9 votes
1 answer
3k views

How much RAM you actually need to keep whole global BGP routing table?

It seems that different sources claim very different RAM consumption for having whole BGP routing table information in RAM and having the router to correctly route the traffic. According to ...
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3 votes
4 answers
447 views

How does OSPF work on point-to-point Ethernet interface (i.e, 2 routers connected by a cable)

OSPF RFC describes two different modes of operation of OSPF for (1) point-to-point and (2) broadcast networks (and others). The operation on (2) involves selecting designated router and backup ...
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2 answers
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PowerConnect 5500 Series VLAN routing problem

My issue is very similar to this link: Dell PowerConnect 5524 VLAN routing I have several VLANs But most importantly VLAN 1 is the flat 192.168.69.0/24 VLAN 10 is 192.168.0.0/16 VLAN 110 is 10.1.10.0/...
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-1 votes
4 answers
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Why isn’t there routing inside subnets?

As far as I know, inside subnets, there is no such thing as routing. How are IP-packets « routed » inside a subnet, and does this circumstance has an influence on how subnets are set up? Thank you in ...
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0 votes
1 answer
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Configure AAA on a router - Extended ACLs

How do I write a named extended ACL which will allow for traffic between a DNS from a LAN (IP address) to a DNS server at (IP address), ping from a host PC (IP address) to any destination and allow ...
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