Questions tagged [router]

For questions about network routers, devices that forward data packets between computer networks, commonly at the network layer (layer 3) of the OSI model.

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Safe to remove ip default-gateway?

We recently changed IP schemes from 192.168.x.x to 10.x.x.x In doing so, I noticed that the prior network engineer had ip default-gateway in the configuration pointing to an old default gateway that ...
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EdgeRouterX not routing traffic [closed]

New to this. I have a tc4400 modem which works fine: when connected straight to my computer, internet passes. However when I connect my EdgeRouterX to the modem and ssh into the router, pinging any ...
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Can I use a wireless access point (or two) to extend my existing wireless network? [closed]

In large commercial buildings I typically see several ceiling mounted Wireless Access Points. When moving throughout the building, I do not have to continually reconnect to different networks (or ...
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Loopback interface

I have a theoretical question about the loopback implementation on a router. I understand that the idea of a loopback interface is that it is a virtual interface which never goes down due to a ...
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331 views

Duplicated Vlan ID

I have one flat network with our data center and it is causing as a lot of issues, so i had to design a new network to separate the buildings from the data center, when I designed the new network i ...
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140 views

How does router know MAC addresses of computers that are connected to a separate switch? [duplicate]

i am a newbie but i need to understand this ARP thing. In my company we have a router that has 3 switches connected to it. On the switches there are more than 100 hosts. I know that switch learns and ...
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Is there a way to know the length of the cable used between the connected SFPs on a switching/routing device?

I have connected two Juniper routers with a QSFP28 optics and I need to find out the length of the optical cable I have used. Is there a command to check that in the router?
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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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Do all devices which use Wi-Fi (802.11) use CSMA/CA?

I know this is quite trivial, but I just want to know if all devices which support Wi-Fi through interface cards/hardware (like laptops/PCs/phones..etc) use CSMA/CA irrespective of their router/...
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Routers FastEthernet interface clock autonegotiation protocol

In routers, for serial interfaces, we need to manually set the clock at the DCE router so that the ends of the connection can communicate. I know that in this way we are using time-division ...
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Using WAN IP for a host instead

I have a single static public IPv4 address from my ISP. So I understand that i can just forward all traffic using port forwarding to one of my private IPs, but still I am wondering if this is the ...
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ARP Router issue

I have a question when a Router receives ARP request to a host that dosen't exists on the forwarding table for that router does the. And this Router is not the next hop either will the Router continue ...
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What device manages VLANs?

I understand what a VLAN is and what purpose it serves. However, I'm having a difficult time understanding where VLANs orginate. Specifically, I know CISCO firewalls, switches, and routers all deal ...
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allow 2 machines to communciate each with their own network? [closed]

2 networks. Network 1 local and i want to be able to receive and send information to network 2 which is at a remote site, branch site. How do i go about connecting both networks so that both machines ...
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Suspect MTR showing incorrect packet loss through router; other tools are not showing loss

Using MTR (sending TCP with or without SYN), I'm consistently seeing packet loss on one intermediate router in the path. UDP does the same. I'm use TCP to avoid the ICMP packet flood limits set. I ...
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Cisco Router on a Stick IP Addressing

I have been running into IP addressing problems with my Packet Tracer network and VLAN assingments. I have 2 switches connected to a router, 1 switch has 4 VLAN's and the other has 3 VLAN's I can't ...
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751 views

Routing between completely separate private networks

I’ve got a request from a partner vendor in a completely separate routing domain to directly route a /24 rfc1918 network on my rfc1918 internal network. The proposed solution has their handoff ...
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Can a device with static native IP communicate with another device getting IP from DHCP

I have a device with a native IP : 192.168.0.1 - 255.255.255.0 I would like to know if it is possible for my computer to join this network using my router set to give ip address from 192.168.0.2 to ...
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How does a router decide what route to forward a packet when routes come from different routing protocols?

I'm a little confused. I know how the best route makes it to the routing table, but what process does the router follow to choose a path to forward a packet if, for example, you have something like ...
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Why is in all arp table snmp oids an interface index before the ip number?

When I want to get arp information about a single ip number or subnet, I have to snmpwalk the whole arp table, as some oid architects had the "great" idea to always insert an interface index ...
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Access list command for specific IP range in Cisco Router 1921

For example: router(config)#ip access-list extended 101 router(config-ext-nacl)#10 per icmp any host 192.168.1.10 From second command line, how to write a command permit icmp any host range 192.168.1....
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Working in packet tracer, can I configure two routing protocols

I am working on network lab designing topology. I am able to configured two routing protocols which surprised me. I configured RIP and OSPF routing protocols in layer3 switch and advertised same ...
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149 views

I cannot Encapsulate on Router

I have VLAN10 and VLAN20, I am trying to communicate between computers with the same VLAN on the following setup: I want to apply encapsulation from Router but it doesn't seem to recognize ...
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3 answers
195 views

Ethernet to fiber converter

If you have a router which only allows Ethernet ports, can you use a converter to convert to fiber? For example if I have a switch that is capable of fiber, would I be able to link this to the router ...
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1 answer
705 views

Some mobile clients are unable to connect to UniFi AP mysteriously

We have two UniFi Controllers, one contains the main internet its directly connected to the fibre and then we give internet to the second controller using LAN connection, internet works fine in main ...
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863 views

Connect switch to router

I have a switch with 4x 10Gb SFP+ ports. Can I use one of the SFP+ ports to connect to a router with a fiber cable?
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Why we define pool for declaring CISCO router DHCP?

In case declaring DHCP server in CISCO routers, should define pool with network addresses.↓ Example Router(config)#ip dhcp pool net1 Router(dhcp-config)#network 192.168.1.0 255.255.255.0 The router ...
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can't send packets if the link is currently busy?

I'm new to networking sorry if my question sounds dumb, I was reading a textbook which says: the outbound link for the packet is the one that leads to router B. A packet can be transmitted on a link ...
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juniper router /var directory is full , deleting .tgz file in root directory

i need to free some space on my juniper router , in the root directory when i use >ls -lash command i see a .tgz file which is 405 M , my question , if i delete this will it cause any problem ?
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Is the outgoing interface of a router in the same Subnet as the Incoming interface of the NEXT HOP router?

In the TCP/IP Volume 1, it is stated that ARP works only on the same subnet. Does this mean that the outgoing interface of a router is necessarily on the same subnet as the incoming interface of the ...
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100 views

Layer 2 managed switch and layer 3 switch

If you have layer 2 managed switches which have VLAN's on them, do you still need a layer 3 switch/router?
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Are all packets addressed with the MAC address of the router as they leave the machine?

In the Comptia Network+ All in One, it is said that most home routers have a switch built into them. It is also said that the first thing the router does is strip off any layer two information present ...
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56 views

Couldn't connect 2 networks in a single router

I made a topology which has 2 separate networks connected to a router, each network has 1 switch and 2 pc's. I took a screenshot of the topology: https://i.gyazo.com/f99231fc75a41faa3ccd0315859fd84f....
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I still can't understand how routers work

I've seen a topology that has 1 router for each network, for example: Network1: 192.168.1.0 192.168.1.2/24 PC1 -> 192.168.1.3/24 PC2 -> 192.168.1.5/24 SWITCH -> 192.168.1.1/24 ROUTER 192.168....
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Range of router and device in WiFi [closed]

Is range of the wifi network depend on Router only? Or does it depend on the connection device also? I believe that the device need to transmit packet to router, so the range till which the device can ...
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1k views

Can't log in after admin password change

I reset my admin password with below command: #Set system login user admin authentication encrypted-password <new password> But now i can't login to my device, what can be the reason?
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How do routers. switches, bridges and hubs deal with corrupted data?

By data corruption I mean frame/packet corruption, we can stick to the corruption due to a collision for simplicity. I know that switches can detect frame corruption if they are not set to cut-...
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2 answers
563 views

Prevent TCP sequence prediction attack

Let's say an attacker gets the sequence number between me and my client. Now he continues the conversation with me and has changed the IP address. How do I prevent packages from being sent to ...
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Modify the IP in TCP/IP packet

My ip address is specified in the ip packet sent to the next node. I wonder if a device that handles this packet can modify the ip address before forwarding it to the final destination? In theory ...
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1 answer
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What happens if the localhost does not interpret 127.0.0.1 as the loopback address?

For the sake of the example, assume gateway to be 10.0.0.1 and host A (my machine) to be 10.0.0.2. If gateway (10.0.0.1) is running a service bound to a port on localhost only, the service should be ...
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Two routers on the same subnet - Possible issues?

What issues can occur when two routers are set to the same subnet (no cascading, both cable connected to the same switch)? For instance: - LAN: 192.168.1.0/24 - Router A: 192.168.1.254 - No DHCP, ...
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Who can get ARP packets? [duplicate]

I'm new to networking. And as far as I understand about ARP messages, Alice can only send ARP to Bob if two are connected. But if Alice and Bob are connected to a router, but not connected to each ...
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Simplest way to achieve single IP communication with IP camera and simple MCU?

I have a product that uses an IP camera and a simple ATmega-based motherboard for general I/O control, managing a very simple web interface, etc. Ideally, I would like to be able to access both of ...
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Gigabit switch on a 100 Mbps router

I'm doing a file server setup, mainly I need Gigabit network on the line. I've setup a Gigabit switch in which both the client machine and the server machine is connected over the same switch. The ...
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2 votes
0 answers
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Why can't i reach devices in the other network?

I have 2 networks and want to connect them with each other. It should be possible that all devices in network A can communicate with devices on network B and other way round. 1 network is "managed" by ...
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3 answers
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How to communicate Different VLANs in Different Switches

I have 3 switches, 2 switches connected to 1 main switch. I have VLAN6, VLAN7, VLAN8 and VLAN9. VLAN6 has VLAN6-1 end device. VLAN7 has VLAN7-1 end device. VLAN8 has VLAN8-1 and VLAN8-2 end devices. ...
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Multi LAN network does the main router to the internet need to be in its own subnet?

I have to design a network where there are 4 within which are different number of VLANs with varying number of hosts per VLAN depending on the building. My confusion lays in the main router, does it ...
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680 views

How to enable Inter-VLAN multicast traffic on a layer 3 Siemens RX1510 Network Switch using IGMP?

I have a single Layer 3 Siemens RX1510 network switch split into 4 separate VLANs on different subsets. Name | Gateway | Subnet VLAN1 | 198.97.100.123 | 255.255.255.0 VLAN2 |...
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327 views

I don't understand IP addressing for a router

I am taking an internet (CISCO) course and don't understand the difference between the default gateway address for a router and its IP address. In every example of the class the default gateway ...
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Inconsistent address and mask error

When statically routing a route in the format [destination network address] [mask] [next hop address or interface name], I get the Inconsistent Address and mask error. Any assistance would be ...
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