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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Why can multiple ASNs have ROAs for the same prefix in RPKI?

I am trying to understand RPKI better and I am looking at some raw data dumps. My initial understanding of RPKI was that it would help identify and authenticate "the one" ASN that is ...
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OSPF routes are not advertised

routers with ASBR2 connecting to AREA 0 and 10 and ASBR1 connecting to area 0 and 20, there's no entry of routes in R1's routing table, help me out R1#sh run Building configuration... Current ...
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RIP routes are not being advertised

I have 2 routers(R3 and R4 connected with serial links). I have advertised my loopbacks with RIP ver 2. with 192.168.1.1/32 and 192.168.2.1/32 on R3 and 192.168.3.1/32 and 192.168.4.1/32 on R4. My ...
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Perform port forward on 169.254.0.1 device [closed]

I have teltonika router on a mobile connection Lets say the ip is 10.132.141.25 On the lan of the router I have a device that is default setup to have the ip IP = 169.254.0.1 Mask = 255.255.0.0 ...
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Fiber Ring Routing across L2/L3 HP switches [closed]

Having some issues for routing traffic from a 5406zl procurve switch through 5 tagged 2930f procurve switches and a 8212zl switch. I want to route all traffic to my firewall which currently is ...
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3 answers
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When would we use more than 1 dynamic routing protocol?

I am learning about different dynamic routing protocols and I've learned that each dynamic routing protocol has an AD assigned to it which indicates the trustworthiness of the learned route from that ...
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OSPF - How does slave know what to send LSR to when DBD is not shared by the master

Consider a topology where R1 and R2 are connected. R1 has following networks. 192.168.1.0/24 192.168.2.0/24 192.168.100.1/32 R2 has following networks. 192.168.2.0/24 192.168.30.0/24 192.168.2.1 and ...
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Can a router provide DHCP to multiple subnets that are connected via switches?

I'm trying to understand if it is possible to have a router (as shown in the below diagram) provide DHCP leases to more than one subnet if the subnets are not directly attached. If both the printers ...
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Basic question on 'network history based routing tables'

I have encountered the following sequence of words: 'routing table formed on the basis of network history information'. I know that initially, routers discover neighbor nodes and therby the possible ...
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Understanding mtr output [duplicate]

Here is my mtr output to googe.com. mehost (me_IP) -> google.com (142.251.40.142) 2022-06-09T09:55:16-0400 Keys: Help Display mode Restart ...
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Routing VLANs to Firewall Ports

My network has 3 VLANs: 10, 11, 12, and their address spaces are 10.0.X.0/24 where X is the VLAN ID. Their default gateway is a virtualized pfSense (even though it's virtual, I will use terminology as ...
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VLAN and firewall interconnection

I'm encountering some difficulties to connect some VLANs to a physical firewall. In details I have a core network with a L3 switch as a router and some L2 switches as access network. The network is ...
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1 answer
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IPv6 subnets without delegated prefix

I have received an IPv6 network from my provider, say it's 2001:db8:1::/48. I did not get delegated prefix from them. I would like to use the IPv6 addresses on different networks behind a firewall (...
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How do we discover hosts on another subnet without knowing their IP or MAC address

If I have a client who wishes to send a UDP packet to another client, how would I scan for his IP address if Client 2 is located in another subnet? If I'm trying to discover clients on my own subnet I ...
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Setting an OSPF router in one area that doesn't see other areas

Could an OSPF router be configured so that it can only see its own area LSAs and does not accept LSAs from other areas? (For example, if it is in area 2, its routing table just shows routes in area 2, ...
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Routing correctly mesh + gatewaty [closed]

I have a router modem DSL I have 2 Aimesh Asus AX XT8 For a reason the node can not talk with the router base over WIFI (long range). I than connected the lan on the modem(DSL ROUTER) to the NODE - ...
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Connecting 9 Remote Sites with VPN Tunnels

I am working in a Cisco ecosystem and need to be able to test a 9 tunnel IPSec network over the internet using 10 x Cisco 1941 routers. This is a "hub and spoke" type configuration; where ...
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bgp and routing

I need a bit of help understanding what is going on in my topology. I really want to understand why i can ping 1.1.1.1 from r4 but not from r5 or r6. Please help and advise me. Many thanks guys r1 ...
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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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2 votes
2 answers
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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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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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2 answers
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How to configure a layer-3 switch for routing between 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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1 vote
1 answer
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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
3 answers
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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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2 answers
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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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2 answers
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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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1 answer
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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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0 votes
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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1 answer
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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
61 views

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
163 views

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
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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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3 answers
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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
237 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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