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.
2,146
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Traceroute for external IP does not go through the gateway
I'm new to networking and currently playing around traceroute. I googled my ip which is say 20.20.20.20 and tried to traceroute it from my local laptop.
I have a wifi connection and a router is ...
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How do I NAT and route ip addresses in a 5G wireless network? [closed]
I am trying to route an ip address (camera sensor) to an edge server through a 5G network. The camera sensor is connected to a 5G Modem. The camera ip address is 10.40.3.1, the 5G link ip address is ...
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using Internet of specific modem through proxy [closed]
I have 1 router and n modem and proxy has been set through them like following figure and the proxy address is like 192.168.121.40:3041, how can I make sure that I am using modem 1 Internet not using ...
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How do you set an A record for any shared host? [closed]
I'm trying to use an A record to redirect my domain to a separate domain that I own. This process has worked fine with DigitalOcean Droplets -- I just add their IPv4 address in the A record and the ...
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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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34
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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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79
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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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[Mininet/Miniedit]: Routing doesnt seem to work in case of 2 routers
Similar to the question asked yesterday, 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)
...
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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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1
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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 SVI's 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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Trace Route RTO in two or more hop but next hop works [duplicate]
Today when I was doing tracert,
in the 2nd & 3rd and also 4th Hop I get RTO but my next hop seems to be reachable. How come it works?
Please answer asap.
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90
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Multiple GRE tunnels towards single host using anycast IP
I'm trying to build the following network architecture:
Where clients try to connect to a backend server (e.g. SSH) by using a Public Anycast IP adddress (1.2.3.4), that routes the client to the ...
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multi-site vpn with only one site reliably addressable from the web at large
i have a small network like so:
site-31:
wan public ip (dynamic) on isp fibre is reachable from the outside world. an automatically updated dns entry is maintained to keep the ip current whenever ...
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Routing vs Forwarding [duplicate]
What is the difference between routing and forwarding?When the network is a packet transfer network I dont see the reason for routing since forwarding a packet between nodes requires a routing ...
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Multiple hosts with same ip/subnet seperated by router possible?
Bit of a newb question but just curious if it can be done.
Is it possible to have multiple hosts with the same ip/subnet (eg 10.101.30.10/24) each seperated by a layer 3 switch/router, where one of ...
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Tracing a route, from 127.0.0.1 through my network to 20.43.161.105
Greetings in the name of network engineering!
BACKGROUND:
The IPV4 network consists of the following nodes:
Node 0:127.0.0.1
Node 1:10.1.1.1
Node 2:192.168.0.1
Node 3:192.168.1.1
Node 4:210.x.x.x
Node ...
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how do 2 different network communicate with each other
Suppose we have 2 networks with 3 PCs in each. As I understand, they can easily have the same IP addresses, but routers have different public IP addresses(e.g. here 158.127.10.3 and 158.127.10.4). So ...
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How Network layer routing actually works in the physical world
This is my first question here, It might be a vague or off topic, I apologise in advance, but I am happy to improve it
Basically I have a somewhat decent theoretical understanding of the OSI model. ...
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5
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Are there any methods of differentiate between a single computer and a NAT router?
As far as I know, a traffic from a NAT router should appear similar to traffic from one computer with a single IP address. If you do not have any access to a network (let's say you are an ISP), can ...
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How should edge switches have their routing configured (when there is a mgmt vlan in the mix)
I'm having trouble with a new network topology we are trying to implement onto our environment. The issue seems to be with the switches. The problem is not relevant to this question but for ...
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If your ISP already has a gateway, why do you need another gateway with NAT to come before a layer 3 switch?
Please bear in mind that I am learning and have never set up a network with routers and switches myself. Also please bear this is sort of going to be loaded question because there are multiple layers ...
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Can you have multiple paths in BGP through different ASes?
In a course about networks in my university, we learnt about how in BGP routes, each AS chooses a single route to each IP prefix (though you may have multiple iBGP routes).
Meaning that in the ...
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For IPv6, How much processing delay difference between using /64 and /127 for Core network interconnection?
I've question about IPv6 routing processing delay.
Lets assume we've got big Core network with huge traffic and many hops.
All router's p2p interconnection addresses are used /127 network.
In my ...
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Sharing same IP address inside LAN? [duplicate]
Q: if 2 devices A and B share same ip address in LAN, can device A retrive all messages whose destination is device B?
I think this depends on how the LAN is configured.
If it's wireless then device A ...
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2
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247
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connect two private network using pfsense
I have two pfenses (say p1 and p2) in two separate networks. Each has a public IP. There is an internal network on each side (say n1 and n2). I want to connect these two networks through these two ...
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Exclude a certain vlan/subnet from layer3 inter-vlan routing
We have new gen aruba (hpe) switches in our environment.
There is a backbone (5412R zl2) which all edge switches are connected to. The edge switches are also layer 3 (2930F). The backbone delivers ...
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79
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GNS3 subnetting and routing
I have a project assignment that consists of 3 routers, the ISP, and 2 company routers, the ISP can address a network /24 IPv4.
I delegated a /25 to DNS servers and a /26 to one company and 2*/30 to ...
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Possibility of transferring data over the same-level networks, rather than the higher-level network
This is a silly(maybe interesting) question.
Assume four ASes are connecting to the Tier 1 network(A, B, C and D). B is peering with C and D. A is close to B, but too far from C and D to make peering. ...
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The relationship between AS upstreams, downstreams and peers
I find AS1221 is both the upstream and the peer of AS13445 from ipinfo.io/AS13445. However, as far as I know, there is no upstream or downstream relationship when talking about peering. Is anything ...
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How does a PIM router know which neighbour is the upstream router?
I understand that certain PIM messages such as Join/Prune and Graft have a field called 'Upstream Neighbour Address' used to indicate the recipient of the message, which is the upstream router for a ...
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Connecting L3 and L2 switches with VLAN settings
I have 1 L3 switch with
Static ip - 192.168.0.252
Two L2 switches
Switch A - 192.168.0.250
Switch B - 192.168.0.251
I have created VLANs in L3 switches with 192.168.1.1 and 192.168.2.2 ips abd set it ...
- 101
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In multicast, do shared trees exist solely to reduce router processing of (S,G) forwarding states?
I am asking this question strictly at a conceptual level. I am not asking from a specific protocol's standpoint.
Why do shared trees exist in multicast routing? What was the reasoning behind them?
...
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63
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Make printer in different subnet accessible to other subnet
i am creating a network and i want the printer which is in a different subnet to be accessible by all other subnets. The router network is 192.168.10.0/24 further subdivided into /28 subnets.
The ...
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