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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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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How to configure WDS for TPLink router [closed]

I am trying to configure my TPLink router as a repeater. My main router which is connected to Internet is Genexis router. I know from various tutorials that this can be done by enabling WDS. But in my ...
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Error: unknown connection [closed]

I am trying to add a secondary IP to an active network enps0 but when I sudo nmcli con mod enp9s0 +ipv4.address "184.67.98.42/24" I get Error: unknown connection 'enp9s0'. I am on CentOS7 ...
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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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Multi-NIC RHEL host when would we want to force bind local NIC on TCP socket connect to remote server [closed]

fairly basic situation with RHEL6/7 host, and 3 eth* interfaces different IP addresses each, and a "normally" configured static route table. Coding up in C a basic socket(2) + connect(2) ...
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2answers
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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
55 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
55 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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How to determine the best server for a given client IP [closed]

A client connects to a "dispatcher" server. The dispatcher is supposed to respond with the name of a worker server for the client to connect to. The client then connects to the worker. My ...
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Switch with VLAN: How to map between VLANs networks

Assume the following network layout +--------+ ----------------------------------------| Switch |----------------- | ------------------------+-----...
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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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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
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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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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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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
41 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
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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
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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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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
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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
628 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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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
137 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
79 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
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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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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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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
77 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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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
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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
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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
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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
50 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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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
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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
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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
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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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2answers
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Valid routes iBGP advertisements

Routers announce to their iBGP peers, the Best routes for each networks it has in its database Is it possible, to announce additionally to the Best route, also all the Valid routes to the iBGP peers ?
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Static routing with multiple networks/nodes

Here's the network topology: Here's the routing table of the R10: My routing table is right? I just want to make sure I understand the static routing and how it works if one or more nodes fail. ...
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1answer
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Does RIP v1 store next hop in its routing tables?

Does RIP v1 routing protocol store "next hop" field in its routing tables despite not announcing it in the updates? And if yes, how does it do that, simply by storing the address of the node ...
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1answer
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I cant ping across Lan?

Current configuration : 2695 bytes ! version 15.1 no service timestamps log datetime msec no service timestamps debug datetime msec service password-encryption ! hostname ...
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iBGP Question reagrding Distribute - List from EIGRP

So, I have the following topology. A-B | | C-D A-B-C-D are Routers. It doesn't matter what are the IP's of the interfaces. What matters is that I have 2 loopbacks for each router. 1.1.1.1 and 11.11....
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1answer
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Understanding BGP communities

Lets take this basic topology: RTR A ---- RTR B Routers A and B have an eBGP connection. At router B we can have a route map saying: match: community-list xyz action: permit/deny etc Questions: How ...
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1answer
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Using a single device as both a media converter and switch

So I have an Aruba 2530 switch with a couple of SFP slots, an incoming fiber connection and a modem that only has RJ45. There's limited space and I want to use as little boxes as possible. Is there ...
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2answers
53 views

Is It possible to make Router On A Stick with two physical interfaces in the router?

If we try to implement router on a stick (ROAS) for try interVLAN communication, we must to use one Phisical interfase and split it into several "logicals" interfaces. Until Now all right. ...
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1answer
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I can't ping the gateway IP (fe80::1) from the internal port in my fortigate 60f firewall

I am using a fortigate 60f firewall. I have configured it for both ipv4 and ipv6. I have used the SD wan (by adding wan1 and wan2) for load-balancing. Moreover, I have configure a default static route ...
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2answers
58 views

Why does ARP request not use a router instead of broadcast?

Why in ARP request does the source computer broadcast a message with the destination IP address to find the MAC address of the destination computer? Why doesn't it send the message to the default gate ...
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I cant Ping from lan 192.168.44.0 and 192.168.45.0 , pc 3 pc 4

R0 and R1 are linked with ospf , and R1 with static route with MLSw. If i change R1 conn with MlSw to #ip route 0.0.0.0 0.0.0.0 g0/1 or g0/2 i can ping , but need help with static route conf ...
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2answers
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In Routing Tables how does the Interface affect the gateway Gateway?

I'm Looking at this routing table from netstat -r. How does the interface relate to the Gateway? the first entry has gateway 192.168.1.1 which is the gateway to the router. the Interface says 192.168....
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ping shows different outputs

Both VLANS are working, and pings from R1 to R0 and vice versa also work successfully. But when I ping from the pink PCs to the blue PCs I get destination unreachable, and when I send pings from the ...

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