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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Help with route command [closed]

What are router-net2 and router-net1 in the commands below? route add host 192.168.1.2 router-net2 1 route add host 192.168.1.3 router-net1 1
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Why does setting MTU 1452 solve Internet problems and how to fix root cause? [closed]

In our church we get Internet uplink from a friendly neighbor’s WiFi. At first everything seemed (at least) fine but since some weeks general “Internet stability problems” increased and since approx. ...
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Can't send message from RIP to static through BGP

Before deep into the question, please see this topology and the results of sending messages from one router to the other router: I have succeeded in sending a message from R0 to R2 (or vice versa), ...
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In gnss3, why can't I ping my cisco router from my VM?

I have the following network, I have never configured a Cisco router before so I'm having a little trouble. In router R1 I used the following commands to assign an ip to the router: configure terminal ...
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Issues in port forwarding/ Firewall rules [closed]

So i am having some issues with a lab network I have the follwing configurtaion: Default gateway: 10.4.10.1/24 (Connected to External network) Router: 10.5.10.1/24 - running on DD WRT firmware Server :...
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6answers
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How to setup self hosting with redundant Internet connections?

The situation is this: a small broadcasting company is going to have multiple remote cameras sending live video back to the company HQ where they have the hardware to produce the live stream sent to ...
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Why did the IANA specifically choose these ranges for the the private IP address space? [closed]

10.0.0.0/8 IP addresses: 10.0.0.0 – 10.255.255.255 172.16.0.0/12 IP addresses: 172.16.0.0 – 172.31.255.255 192.168.0.0/16 IP addresses: 192.168.0.0 – 192.168.255.255 Is there any reason behind ...
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How can I access a local network namespace from an external node? [closed]

I am trying to set up a runc container running mongoDB Enterprise Edition v4.4 on an EC2 Ubuntu x86 20.04 node, kernel v5.10. I am using the following to set up a network namespace for the container: ...
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Can two routers with their WAN ports on the same subnet use a third router with a LAN port on that subnet as the gateway? [closed]

I wish to use a single Internet connection, with a /29 subnet available on the LAN port Gateway, for two separate, disparate networks using the WAN ports of two additional routers on that same subnet. ...
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1answer
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Ping6 replies go to a different interface [closed]

Server A has two interfaces (i1 and i2) with the same IP on them, say fd11:1111:1111:1111::1/48. Server B has the same two interfaces with the same IP on them, say fd11:1111:1111:1111::2/48. When ...
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1answer
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ebgp in one broadcast network

can you help me? Why vios4 dont change next-hop(ebgp) when it send 3.3.3.3/32 to vios5? On vios5 i see network 3.3.3.3 with next-hop 192.168.1.3
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1answer
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EIGRP : Feasibility Condition not satisfied

What happen if the Feasibility Condition not satisfied and we can not pick a feasible successor?
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AODV Broadcast ID/Broadcast Sequence number/RREQ ID reason for existing

I was looking into Adhoc On-Demand Distance Vector Routing (AODV), in particular the following sources: https://www.cs.cornell.edu/people/egs/615/aodv.pdf https://tools.ietf.org/html/rfc3561 Both ...
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Can pfSense do routing or port forwarding based on DNS name?

Currently our network looks like this: The issue is that OpenVPN Access Server does not support working behind a proxy server so some features are currently not working. As we only have 1 external IP ...
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4answers
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What are some real world applications of OSPF?

When I search for OSPF real world application or implementation, I always get the explanation of how OSPF works or how to calculate the cost. My question is, is there any real life scenarios of how ...
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1answer
33 views

How to block telnet access for one particular network from all networks except one using Extended ACL

Scenerio is given in the picture. I want to block all the networks except 192.168.5.128/25 from doing telnet of 192.168.5.0/25.
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2answers
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Do DSLAM and OLT function like a switch?

Let's say for example we have the following hypothetical topology: In each network, can each user communicate with each other? For example, can User 1 ping User 2?
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2answers
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Where are ATM switches located in real life?

Consider the following diagram from this link: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/bbdsl/configuration/xe-3s/bba-xe-3s-book/bba-ppoe-atm-xe.html If I am correct, here's how I see it ...
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Cisco IOS Software [Everest], ISR 4331. Vlan+Vrf+Dhcp

I'm looking after to use a setup with that objectives in mind: Create a subinterface on interface GigabitEthernet0/0/1 create a Vlan and assign it to that subinterface create a vrrf and assign it to ...
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1answer
18 views

What is BTU/hr gauge of Cisco ISR4461/K9?

I searched everywhere but couldn't find it. If anyone knows the system, can answer? How much BTU (British thermal unit) /hr uses by this router.
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1answer
41 views

NAT cannot communicate with 2 network

I have configured BGP for routing and NAT for HQ and Branch. I can ping from windows / server to public IP and also Linux Mint ping to public IP. but, I cannot ping / communicate between network HQ to ...
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Segment Routing Encapsulation on Client Interface? [closed]

I wanted to test SRv6. Always between two clients (client 1 <-> client 2). If I do the encapsulation on the client everything works smooth as expected. Client 1 (encap SRv6 Tunnel) <- 2001::/...
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1answer
293 views

BGP Best Path Selection Algorithm

According to this cisco document (https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html), shortest AS_PATH is the #4 algorithm in the sequence to evaluate, out of 13 ...
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What are the administrative procedures for moving the geographic location of a network?

Original Question Suppose that Alice operates a website hosting business in Maine. She has a warehouse full of servers to which a /28 range of public ipv4 space is routed (call it the W.X.Y.Z network)....
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Loopback interfaces subnets [closed]

Assuming that loopback interface is always alone in its network, what are the practical reasons to have IPv4 subnet prefix shorter than /32 for these interfaces? Moreover, why according to various ...
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1answer
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Static Routing - host to host ping does not work (MikroTik)? [closed]

I'm trying to do static routing using actual devices. Below is my setup: The left router is a MikroTik RouterBoard hAP lite. The right router is a MikroTik RouterBoard hAP ac. I want to ping from ...
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1answer
75 views

routing MTU size and encapsulation?

I did some research for my question beforehand such as this one:Cisco routers THROUGHPUT - MTU and packet size however, it seemed not precise to explain the doubts in my head. My primary goal is to ...
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1answer
44 views

How Does “IP Passthrough” Work? (And What is DHCPS-Fixed?) [closed]

I recently set up a new internet connection at home and my modem didn't support bridge mode. Instead I had to use an option called "IP Passthrough". Here's some details on that modem ...
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3answers
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Trace internal equipement from Internet while answering

I would like to know if it's possible to achieve a traceroute of nodes on an internal network from an equipement on the internet answering to a query. Let's say that a client on an internal network ...
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1answer
34 views

Is it possible to assign an IP to a tagged dual-mode port (Brocade)

I have a router (ubiquity USG) and a Brocade FCX648 Layer 3 switch. (I have a second one in a stack, but that's unrelated). The end goal is to be able to connect the switch to my router, provide IPs ...
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3answers
63 views

Policy Based Routing by Interface and IP

Is it possible on Juniper or Cisco to configure PBR where it matches on an ingress interface AND a source IP address? My scenario traffic flows are as follows: Router1 > Router2 > WAN_Optimiser &...
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3answers
71 views

Routing with private addresses

Let's say that we have a private network, with private addresses and a NAT enabled router at the end. If the router is misconfigured and routes traffic to the global internet, keeping as source ...
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Optimize and Concretize Routing Table [duplicate]

Hello I receive that homework from my teacher and I can't understand this thing I have to optimize the routing table and then make it on CPT. But I have no idea, because I was ill when he/she ...
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1answer
56 views

BGP unnumbered on P2MP link

I'm wondering what will happen if BGP unnumbered session is configured on a link that has multiple routers on the other side which are both IPv6-capable and will both reply on RS and produce RA ...
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2answers
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General: What is a dynamic gateway, how does it work, where is it used?

I saw this option in my OPNsense gateway configuration, and was hoping someone could shed light on what it is, exactly: Dynamic gateway policy: [YES/NO] This interface does not require an ...
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2answers
54 views

Is the routing table used when sending IP packets to a host on the same LAN in ipv4?

I am having trouble understanding the steps in order to send an ip packet to another host on the same LAN. Most sources online that I have read and people I have talked to say that the host uses the ...
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2answers
40 views

Need explanation on vlan tag/ip mismatch

What happens if I have a switch configured with an accessport on vlan 20 and someone uses a static ip in a different subnet. vlan 20 has the subnet 192.168.20.0/24 in the router. Suppose the ip used ...
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3answers
32 views

2 Routers, 2 Internet Connections, 2 Subnets - 1 Link?

I worked something out in my head, but I am having a hard time putting this into practice. We own 2 units, both within 100m of each other. Both units have internet connectivity, but there is a single ...
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2answers
52 views

How to connect two different subnets

This may be a very basic question, but I'm a networking newbie. So I have the following setup: Server with one NIC on IP 192.168.10.1/24 (Network A). It is not possible to change this IP. Computer A ...
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2answers
400 views

How to block advertisement of a prefixes recieved from 1 BGP neighbor to another

I have a eBGP topology as follows: RTR1 ------ DUT ------ RTR2 (AS100) (AS200) (AS300) I do not want any routes sent by RTR1 to be advertised into RTR2 by DUT I do not know what exactly the ...
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4answers
497 views

Difference between SVI and subinterface

Modern multi-layer switches seem to support both SVIs (switch virtual interfaces) and subinterfaces concepts. Both are virtual layer 3 concepts used to perform routing functions and some equipment ...
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2answers
64 views

What is exact meaning of broadcast network in OSPF?

According to rfc2328(OSPFv2), broadcast network is "Networks supporting many (more than two) attached routers, together with the capability to address a single physical message to all of the ...
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2answers
170 views

Is it possible to filter directly connected networks redistribute with BGP based on a peer basis?

Assume a simplified case in which router R1 is connected to two BGP peers: one eBGP peer and one iBGP peer. Is there a possibility to advertise directly connected routes only to one of them ...
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4answers
86 views

How the device chooses between multiple DHCP pools?

In a router , you can create and configure multiple DHCP pools each one with its own default route and dns server . And because the DHCP pool configuration is not specific to an interface in a router, ...
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1answer
28 views

Routing or forwarding unsolicited packets back to source - as a way to mitigate nuisance traffic?

I've identified a particular IPv4 /24 subnet that is responsible for a great deal of the unsolicited packets being rejected by my router (and making my log files larger than I'd like them to be). As ...
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1answer
36 views

Site to site ASA Routing question

I am doing a lab about DMVPN and Site to Site ASA integration. There is no problem in the DMVPN. However I have problem in establishing route from Site to Site ASA to DMVPN. The router on the left is ...
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2answers
48 views

Routing infrastructure doubt. It is a functionally design this?

I have design the following network diagram, but I cannot figure out if it could cause some issue on the network: Some detail about the infrastructure: Network connect Ext rtr A, Int rtr B and C is ...
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58 views

Dual WAN with each ISP in a VRF - Cisco IOS

I have a DMVPN spoke router setup almost identically to the spoke configuration listed here (Also quoted below): https://www.cisco.com/c/en/us/support/docs/security-vpn/dynamic-multi-point-vpn-dmvpn/...
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2answers
78 views

Routing Protocols and sharing information

I am running multiple Protocols on different Routers as so: R1-RIPv2 EIGRP OSPF R2-OSPF and RIPv2 R3-RIPv2 and EIGRP R4-EIGRP and OSPF This is not a practical exercise, it is just to explore how ...
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3answers
63 views

What kinds of organizations use routing protocols (aside from ISPs)?

I don't understand why would an organization aside from an ISP even use routing protocols. Let's say there is a big company with 5000 employees, and they want to have a network throughout their ...

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