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.
2,165
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How do I expose a VPN'd Ubuntu server to the internet [closed]
I have a very interesting situation going on here. I have a digital ocean droplet running Ubuntu. Within this Ubuntu box, it is VPN'd into a network with openfortivpn. The issue is, while the VPN is ...
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How can I set up a local DNS or proxy that uses OpenNIC for OpenNIC domains/TLDs, and Cloudflare (or any other) DNS for the rest? [closed]
I've been pondering how to achieve this for the past few days. I love OpenNIC and everything they're doing, but sometimes the DNS servers are not always the best for normal, daily usage. While it's ...
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OSFP anycast route different area
So.. lets pretend i need to advertise a route in anycast to the backbone, obviusly same route that in this case is 192.168.1.111 .
Can be a problem if the routers that advertise that route to the ...
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Why Can't Routers Between a Switch Communicate with Each Other while Routers Between Two Switches can Communicate without VLANS [closed]
I am new to networking and just learning routing and switching in layers 2 and 3. I have two different topologies that baffle me when trying to send packets. In the first topology, I have 4 routers ...
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How can I implement BGP between two routers that have already been configured with different routing protocols?
I have two different AS with different IP ranges and subnets, and the first router stack is running RIP, and the second one is OSPF. I want to configure BGP between "Router-PT Router23" and &...
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ISP ARP tables and routing [closed]
So I'm Network+ certified and have a beginners understanding of how network communication works, my head starts to split a bit though when I think about how the information is actually communicated ...
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233
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Who/What is AS4100000000?
I have seen AS4100000000 in some routing datasets I am working with, for example Routeviews:
194.153.134.0/24 AS4100000000
I would like to understand where it is coming from or who controls it so I ...
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2 Routers for PPPoE and NAT 5 Public IP [closed]
My ISP have provided me with 5 Public IPs. I tried to NAT these 5 IPs to our local server by using this setup. The primary router will be setup for the internet connection while the one-to-one NAT of ...
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If the destination MAC is changed every hop. When it arrives at the destination router, how will it know which device to deliver the packet to?
I learned that inside a packet there is information about the sender's public IP and MAC and the receiver's public IP and MAC, and that at each hop, the sender's and receiver's MAC are changed along ...
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Networking across campus with multiple ISPs
I currently have a campus that gets service from two ISP's that are each connected to their own router. The ISP's ingress and their routers are in different buildings on the campus. The buildings are ...
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Geolocation specific ASN
question: is it possible to determine the geolocation of a city/region of a specific ASN? For example, Telecom Italia has many ASNs. Is it possible to know for each one "which soil" they ...
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536
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Can LACP connect to 2 different firewalls?
I'm in the process of redesigning my network and have a few questions about LACP configuration:
Can LACP be set up to connect to two different firewalls?
In the diagram I provided, there are three ...
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2 Cisco ASA Firewalls - TCP SYN FLOOD
Problem
We have 2 firewalls, a DMZ firewall and another firewall named FW1 in a testlab. Both are CISCO ASAs. The shared services and jumphost are behind the FW1 firewall. The 172.28.208.0/24 subnets ...
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Import route from one rip group to another
Just started out with RIP implementation in juniper routers. Was not able to find much info on the following points. Any help is appreciated. I have defined 2 RIP groups, both in the same routing ...
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must an IPv6 router have an IP address in the SLAAC prefixes it's advertising?
for example: i have a router with the lladdr fe80::1/64 on interface e0. the router is configured to advertise the autonomous, on-link prefix 2001:db8:1:1::/64 in RAs on e0. must the router have an ...
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How to configure OSPF to create desired routing paths?
Is there any way to assign OSPF cost so that when is traceroute 147.147.11.98 from R1
it goes like R1->R4->R5->R2
and when I traceroute 147.147.11.98 from R5
it goes like R5->R4->R1->...
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Connecting and combining 2 networks
I have networks in 2 separate buildings. Each has its own private IP range. We're installing a private fiber link between the two buildings. Do I just need to adjust the subnet mask so they can see ...
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The use of VRF Lite
I have a quick question about VRF Lite.
So I understand that VRF is a technology which allows the router to build multiple virtual routing tables which divide the network on L3 with each VRF table ...
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What is the recommended destination public IP for Cisco IP-SLA?
I want to implement Cisco IP-SLA, but I am not sure what the destination IP I should use. Any recommendations or advice?
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Explaining the entries in routing table
I would like to ask for help with explaining every particular entry in routing table. That is what I receive after calling route print in my PC, based on Windows:
So my understanding is:
0.0.0.0 ...
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How do layer 2 switches route based on MAC when daisy-chained?
Trying to think about this from a hardware design perspective, if I had to design an FPGA or a uC or something to manage a single port being the gateway port and one or more switched ports for routing,...
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IPv6 subnetting with different end device requirements
`I have three main buildings with building A with 242 end devices, building B with 54 end devices and building C with 894 device. And all the routers are connected to each other like ring topology. ...
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How to handle routing with overlapping ranges as general concept?
An existing network managed by a 3rd party contains routers of the same subnet (in this case 192.168.0.0/24) and is connected to a central infrastructure using a VPN tunnel. All connections are force ...
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Is internal network traffic sent to private subnets via their NAT Server?
Similar to this question, I'm wondering how resources in my public subnets communicate with those in my private subnets - when there is a NAT service present.
My impression is that a self-managed NAT ...
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Can control plane and data plane be different in BGP?
I have heard that the BGP routes exchanged between the routers do not necessarily mean that the actual data path will follow the specified routes. How can the data path and control path be different ...
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Trying to achieve ECHO request reaching destination in other VLAN
I'm working in a network on packet tracer, when I'm sending ICMP requests from VLAN 20 (yellow field) to VLAN 10 (turqoise field) the packets get stuck at the switch where it is connected to.
Case 2: ...
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Confused about the BGP ConnectRetryTimer
I am studying about BGP adjacencies at the moment.
About the Idle state. I've read from my Cisco book that errors can cause the neighbor state to revert back to Idle and the ConnectRetryTimer is set ...
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Router to Wireless router (Packet Tracer)
Hi, Can anyone help why I can't ping from my pc in office network to my laptop in guest network or wireless network. It is possible to ping from guest network to office but failed vice versa.
Main ...
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Routing table routes with different administrative distance
When a router receives two routes from the same routing protocol to the same destination network, it uses the Metric to decide which one to add to the routing table, so if Metric was different it will ...
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Is the security of BGP using a pre-shared key dependent on the security of MD5?
The german wikipedia article to BGP states (translated):
In the basic configuration, a BGP-Router is susceptible to spoofig
attacks, through which the attacker can manipulate the routers. By using
an ...
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Allow active connections in firewall on multiple BGP connected routers
We have a network on its own AS with 2 routers connected to 2 AS via BGP (full routes).
The routers also both have a firewall on board that by default drops all traffic, except the one allowed. We ...
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Routing table - Routes with heading [duplicate]
I want to know when routes headings are added ?
For example:
Are they added only for directly connected routes?
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Routing table updates Limits
When the router builds its routing table , it uses the routing updates with its neighbors , but the routers on the internet don't have entry for every other destination network on the internet right ? ...
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When would we want to do traffic steering?
After going over EIGRP, I ran into offset lists which allow the modification of the metric of routes advertised by EIGRP and provide the option of traffic engineering.
I am not very experienced with ...
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Nonsense RFC 4604 forbids IGMP General Queries in SSM range but IGMP General Queries have no range and are send to 224.0.0.1, the all-systems address?
RFC 4604 Using Internet Group Management Protocol Version 3 (IGMPv3) and Multicast Listener Discovery Protocol Version 2 (MLDv2) for Source-Specific Multicast:
2.2.3. IGMPv1 Queries, IGMPv2 and MLDv1 ...
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Pfsense NAT with site-to-site VPN
For a client I am building a network solution that enables them expanding their available online presence.
I am running into a problem with port forwarding to an IP which is routed over an OpenVPN L3 ...
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If I am connected with two network then which network will be used for communication? [closed]
First I connect with a WIFI (to get internet connectivity) and then I connect with my company's network using Pulse Secure. When I do ipconfig then I get an output something like below:
C:\Users\...
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[Mininet/Miniedit]: Can't get the host machines connected via a router to ping each other [closed]
As a part of an experiment, my network has the following topology for two host machines connected to a router in mininet(on Ubuntu 22.04.02 Virtual Machine)
h1 - r1 - h2
The host Machine 'h1' ...
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Why do typical spine-leaf architectures have one border leaf instead of all leafs having an uplink?
In all spine leaf architecture explainers I've seen I've come across the concept of the border leaf which is used as the connection point of the entire clos network to an upstream router, be it either ...
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Routing in Azure subnet to on-premise and out vpn-tunnel
We are trying to establish a connection from Azure VNET(10.10.0.0/16) over S2S VPN Tunnel (VpnGw1) to on-premise network (192.168.1.0/24) and then out through sonic wall to second VPN Tunnel to ...
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Do Directly Connected Routers Need Routing Protocols For DHCP Relay To Work?
Let us say that we have R01, R02, and R03 connected to each other, and each of them is connected to a different subnet SUB01, SUB02, and SUB03, respectively. R03 is set up as a DHCP server, and DHCP ...
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How to configure ipv6 static route for cisco router
I've tried but i don't know if i got it right. So per the picture, If i want to set a static route from R1 to SW1 subnet The command should be ipv6 route 2001:d79:1:345::/64 2001:d79:1:13::
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Why No Ping When Use Static and RIP in This Network?
I am a learner. I learned somewhere that we could use static and dynamic routing in the network.
I built the simple network shown in the attached picture.
I configured router8 with static routes to ...
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VPN doesn't work
I'm trying to configure VPN between 2 routers:
R1: public IP is 200.0.0.6/30 on S0/0/1, private IP are 10.0.0.0/8 and 20.0.0.0/8
R3: public IP is 210.10.0.6/30 on S0/0/0, private IP is 192.168.3.0/24
...
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How do communication networks physically direct traffic? [closed]
I’m curious as to how this would work. I have an ISP that uses Coaxial Cable to deliver its services (this company was one of the original cable TV providers in the neighbourhood, hence why coax and ...
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Can multiple LANs be configured to work as one when connected together? [closed]
Let's say I have multiple standalone Ethernet networks in a classic NAT configuration. The LANs can be connected together resulting in one big network. What kind of router configuration would enable ...
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What's the reasoning behind the "Longest prefix match" algorithm?
I understand the concept and how the longest prefix match rule works.
Let's say a router receives a packet destined for 192.168.100.5 and the router has the following matching routes in its routing ...
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Should I be using point-to-point or broadcast if I plan on using SVIs in IS-IS on Juniper?
Apologies in advance if this is super-basic question, still learning ISIS.
I'm migrating from Cisco over to Juniper in an environment where all of the switches are running EIGRP, are on a 172.31.255.0/...
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In router's config, why do I need to advertise the directly connected network?
I have learned that, in routing config, a router must advertise all of its networks.
For example, in this topo:
Router A need to network 192.168.1.1 0.0.0.255 and network 100.1.1.2 0.0.0.255
But why ...
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Static route is not saved - Why?
I have the following configuration. On R1 I do inter-vlan routing. The problem is when I ping the serial interface of ISP1 with PC MA11 the ping packet is not returned to R1. I wanted to add a static ...
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