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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27 views

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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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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2answers
36 views

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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24 views

Full and incomplete physical path [closed]

I have come across the term full and incomplete physical path several times in the context of whether a logical path is spanned by a full/incomplete physical path. I would like to understand and learn ...
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1answer
38 views

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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0answers
29 views

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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2answers
59 views

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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3answers
54 views

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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3answers
43 views

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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2answers
46 views

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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1answer
2k 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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3answers
139 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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2answers
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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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4answers
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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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1answer
63 views

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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0answers
31 views

Route-map to manipulate metric in EIGRP

I have following Setup R1 --- R2 --- R3 --- R4 --- R5 The same network is being advertised from R1 and R5. There is some difference in delay between the two paths R1-R2 and R4-R5. So the route from R1 ...
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1answer
94 views

How do internet backbones (and their terminations) work? [closed]

If I establish a TCP connection between a web browser in an Australian household laptop, and a web server in a US data centre, what chain of physical hardware will the signal be sent through? For ...
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1answer
70 views

Colocation Rack Networking

I'm a sysadmin tasked with finding a managed service provider or networking contractor to build out our new colo space networking. I'm hoping to get some input to make sure I don't sound like an idiot ...
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2answers
53 views

IRDP protocol nowadays

I'm considering to remove rdisc tool from iputils project (see https://github.com/iputils/iputils/issues/363). This tool implements ICMP Internet Router Discovery Protocol (IRDP). Is IRDP really ...
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3answers
227 views

Why does OSPF use flooding despite using multicast?

We know that flooding is only possible in layer2 switch. But in OSPF router in layer3 uses flooding with multicasting. Suppose we have one router in OSPF uses multicast address 225.0.0.9. If router ...
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2answers
83 views

How in Distance vector routing one router communicates adjacent router through broadcast address and OSPF uses unicast with another?

In distance vector routing algorithm one router can communicates(shared the routing table) with adjacent router by broadcasting message which are in same subnet. OSPF uses flooding to unicast message ...
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3answers
67 views

If person A has a network 123.123.123 and person B has a network 123.123, what happens if they both assign an IP to a device of 123.123.123.123?

This is something I'm confused about...if person A and B have networks with different subnet masks, then what prevents them from assigning an end IP that is identical? It makes me think I'm ...
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2answers
77 views

Switch with VLAN: How to map between VLANs networks

Assume the following network layout +--------+ ----------------------------------------| Switch |----------------- | ------------------------+-----...
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1answer
30 views

osfp route filtering directly connected route

I am using Cisco 2960XR switch 192.168.1.0/24 is directly connected on gi1/0/1 192.168.97.0/24 is directly connected on gi1/0/7 router ospf 10 network 192.168.1.0 network 192.168.97.0 q1) how do i ...
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2answers
61 views

why can't my PCs ping each other?

Consider the following network I can ping just fine from PC0 to PC1 and PC2 to PC3, but I can't ping from PC2 to PC1 or PC3 to PC0. Why? I'll share the configuration from the router: Building ...
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1answer
40 views

Does a router that only has one connection to a switch with four connection have three interfaces in total?

Let us say that we have a router in a network. This router is in turn connected to only one network switch. Does it mean that this router has one interface or not only one but also the connections ...
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0answers
45 views

Cisco IOS XE DHCP Starlink - Static route issue

Today i connected the Starlink dish to an Cisco ISO-XE Box (ISR1111) as a secondary wan link and noticed some strange behavior. I installed a static host-Route to an VPN Tunnel endpoint via ip route x....
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1answer
38 views

How to force routing to https website without the IP

I am attempting to limit a group of Chromebooks to access one particular site for student testing. The issue is that the website is secure but the ssl cert is attached to the url not the ip. The ip of ...
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1answer
43 views

Connectivity issues with 127.x.x.x series [closed]

I have a couple of servers with the below config server1: lo: 127.0.0.1/16 scope host eno1: 127.15.0.1/16 scope global eno2: 5.0.0.1/24 server2: lo: 127.0.0.1/16 (it had /8. I changed the subnet ...
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2answers
112 views

Routing between SVI and routed port on router

How can I achieve reachability from vlan terminated on the L3 switch to routed port on the router, FW? F.E int vlan 10,50 are the SVI's on L3 switch vlan 10 - 10.0.10.254 /24 vlan 50 - 10.0.50.254 /24 ...
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1answer
59 views

Must the host IP be contained in Router's subnet?

The settings are: manually set my host IP: 10.0.1.6/24, gateway: 10.0.0.138/24 they both know each other's MAC (arp -a shows the list) and there is a direct physical connection between them. From the ...
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0answers
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Why do we need Layer 3 logic to communicate to other networks? [duplicate]

My knowledge about networking is a bit rusty and as I am watching and learning about networking, TCP/IP and potentially get a CCNA/CCNP certification a thought crossed my mind: I keep seeing (simple, ...
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1answer
35 views

My laptop not comes on the network when connected to cisco 2951 routing port, so it does not ping [closed]

I have assigned 192.168.1.2/24 IP to laptop with 192.168.1.1 gateway. This gateway is actually the IP address of the Cisco 2951 router port. But my laptop doesn't come in the network that's why it ...
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3answers
641 views

How do networks duplicate packets en route

I am sorry if this isn't a great place to ask this but I'm not sure which stackexchange to use. I'm not a network engineer but I am curious about one aspect of how the internet functions but I can't ...
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3answers
73 views

Basic questions on routing

I'm going to read some books on routing, but I'd like to have earlier correct big picture understanding. So: (1) IP addresses are assigned globally by IANA and RIRS to Internet Service Providers. More ...
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5answers
294 views

BGP <-> OSPF Route Redistribution Loops

In the following topology I have a multi-point redistribution from BGP <-> OSPF and I have recently encountered a routing loop. After further reading I have understood the problematic routers ...
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2answers
80 views

Is a transit agreement with a tier 1 provider sufficient to connect to the entire internet?

Suppose I'm a Tier 3 provider with my own autonomous system number and ip address range, who purchases a transit agreement with a single Tier 1 provider. Is this agreement sufficient to send and ...
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1answer
191 views

Struggling with interVLAN routing + multiple VPNs + default routes on multi-layer switch

I have a fairly simply setup, using a PCEngines firewall running OPNSense and an EdgeCore ECS4620-28P L3 switch. The EdgeCore is doing InterVLAN routing and that works just fine, but I cannot get ...
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0answers
36 views

A possible solution to offloading clients on an existing network

I am working with an existing network that services approximately 1500 rural wireless clients [diagram: Customer], and it uses a single core Arista 7050T layer3 switch [diagram: Main Router] hooked up ...
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0answers
22 views

BGP default behavior for tie breaker [duplicate]

If routes having same AS path to reach the destination, how the BGP will tie break without using any BGP attribute filter? Bandwidth also same on both sides. How its choose the best path. Please ...
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1answer
114 views

EdgeRouter X select one out of two WANs according to target IP range

I am using IPSET to define the interested IP range. I want to direct packets to one out of two WAN connections according to an IP range. Here are my conditions. A specific IP range. It is defined by ...
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0answers
7 views

bad mask for ip adrress error [duplicate]

I'm not too clear on subnetting rules and experienced an error when I tried to assign 192.168.0.7/29 to an interface on my Cisco router. Can someone please explain why it was not allowing me to assign ...
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2answers
83 views

How does the packet travel when I send a ping?

In command prompt when I fire the ping 10.1.1.2 Assume that I am located in Germany and the above IP address belongs to California. How does the packet travel from my computer (Germany) to the ...
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3answers
39 views

Communication at the DataLink Layer

I understand the concept of packets hopping through multiple routers to reach the destination network. I guess this has something to do with the forwarding/routing mechanism implemented in routers. ...
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1answer
60 views

Why I can't ping in my network?

I have the following network: The following is my interface table: This is my PC IP address table: This is the configuration for Router ISP: ISP#show running-config Building configuration... ...
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2answers
53 views

Where is the packet sent if it is determined to be for an host on local network?

When a host attempts to communicate with another device using TCP/IP, it performs a comparison process using the defined subnet mask and the destination IP address versus the subnet mask and its own ...
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1answer
27 views

how to configure EIGRP in my network?

I have the following network With the following routing table: Configuration of router 1 Building configuration... Current configuration : 1056 bytes ! version 15.1 no service timestamps log ...
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1answer
103 views

Static routes and subnetting

Network: 10.0.0.0/24 I decided to divide it into 4 sub-networks: 10.0.0.0/26 10.0.0.64/26 10.0.0.128/26 10.0.0.192/26 If I have to configure static routing on an external router, can I use the ...
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0answers
53 views

Why cant my network send packages but piv6 pings go through?

I have the following network: My routing is as follows: Device configuration for ISP: Building configuration... Current configuration : 1388 bytes ! version 15.1 no service timestamps log datetime ...
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1answer
75 views

Does a router have multiple DLLs inside?

I came across a practice question of true/false answer type . The statement is: "A router has single network layer that will interact with 2 Data link layers" . Ans:True (no explanation ...

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