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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Need Help on Designing Network in Warehouse
I need help on finalizing the Network Scheme for a Warehouse.
Current System has 2 different ISP with total 6 wifi access point for 3 each since it's large Warehouse
Each ISP has 3 WiFi access points ...
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Why do routing tables and arp tables both require a field of interface?
Routing tables are queried using destination IP of a packet to get the next hop IP and to get the interface to send the packet through.
But since the router will strip the ethernet header first and ...
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Router SNATs incoming connections [closed]
For some reason, my router changes the source IP of incoming connections.
I can't find which setting makes this happen or if this expected behavior.
For example, this connection was initiated by an ...
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How did the packets travel from WLAN to Ethernet port on my wireless router? [closed]
Currently, I use an optical modem to perform the functions of a router(Strict meaning) and modem, and it also has a DHCP server.
For my own wireless router, I only connected its LAN port to the LAN ...
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Steps involved for packet transit from Router Ingress to Router Egress interface
I am looking to better understand, what happens within the router when an L3 packet arrives at a router interface and egresses via the exit interface.
For e.g consider the below,
assume Hundred Gig 3/...
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Is the routing table a control plane concept or a data plane concept?
I've always been told that the routing table is a control plane concept. You build this table, collect the routes, the way they were learned, their metrics, and so on.
You then use this information to ...
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Router cannot access LAN with public IP [duplicate]
I have the following setup:
ISP
|
|
external interface (public ip)
/
Router (running OPNsense)
\
internal interface 192.168.0.1
...
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Network scheme based on traceroute commands - is my thinking correct?
I want to create a hypothetical scheme of network containing the 3 routers (R1, R2 and R3) that were listed when running 2 separate traceroute commands.
traceroute 1:
1 ***
(...)
9 R1 (80.249....
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How does the final next-hop router forward a frame to the destination device if the public IP address is that of its router
We know that all device’s connected to the same local network will have the same public IP address as each other, which belongs to their local router.
So, since the IP packet’s destination address is ...
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Computers on different subnets can't talk to each other
I'm teaching an introductory computer engineering course in HS and had students in the lab network together the computers they built in the hardware unit - I appreciate the irony of somebody teaching, ...
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Why MLS2 Doesn't Get ICMP Packet To Where It Should?
This is a Packet Tracer lab from Kieth Barker's website with minor modifications. It is intended to exhibit how can we get to the network 10.10.0.0/24 access to the Web Server 23.1.2.2/24 Using NAT.
...
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Where is 1.1.1.1 really located? [duplicate]
I'm courious how this works:
When ping-ing 1.1.1.1 I get results of roundabout 15 ms, where 1.1.1.1 is located in California, according to iplocation.net.
When ping-ing a random ISP from California I ...
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VLSM Error on Cisco Distribution Switch [duplicate]
I have created 3 VLANS which should not overlap but somehow are giving me overlapping problems. Any reasons why? Is the switch buggy?
VLAN 10 10.1.1.0/28
255.255.255.240 Usable:10.1.1.0 to 10.1.1.15
...
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How can a router that can connect to both a TD-LTE network and a mobile phone network determine which type of equipment to connect to?
From what I understand so far, the equipment installed on the BTS that TD-LTE routers receive internet from is different from the equipment that mobile phones receive internet from. I want to know how ...
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Why is there overlap with two interfaces?
I am trying to configure router0, I assigned ip 192.168.26.1 to gigabitEthernet 0/0 and I tried to assign this ip: 192.168.26.33 to interface serial 0/0/0 but this error appears:
192.168.26.0 overlaps ...
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How can I ensure that NAT hairpinning goes through the gateway?
When I enable NAT hairpinning, will accessing LAN devices through the public IP go through the public network?
After enabling NAT hairpinning and establishing a TCP connection, if the public IP ...
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Why are DNS packets processed by process-switched?
I have a question.
Equipment: Cisco 2821
CEF is enabled on all router ports:
sh ip interface | i CEF
Post encapsulation features: CEF Packet Capture
IP CEF switching is enabled
IP CEF ...
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what do the two parameters SINR and RSRQ mean in 4G routers and what is the difference between them?
I want to know what do the two parameters SINR and RSRQ mean in 4G routers and what is the difference between them?
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which protocol is invoked first by routers ? routing (routing table) or ARP?
I have a question regarding the internet layer of the TCP/IP model: When a data frame is sent by a client to a server located on another network, we know that the routing tables and the ARP protocol ...
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what happen to packets passing through switches and routers?
I am learning networks from hardware and software aspects.
assume below scenario:
we call computers with c prefix, switches with s and routers with r.
all macs and IPs are summerized.
c1 ip=1 mac=xx
...
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Connect Router 4431 to pair Nexus 9k
I have to made the following setup, but I’ m not sure that is works
Before scenarios that works
Router over one link L3 connects to one Nk9 switch. On the Router side I have multiple subinterface ( ...
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Can I get into configuration mode by command "config" instead of "configure terminal"?
I would like to ask: When I configure router or switch in for example Putty, can I get into configuration mode by command "config" instead of "configure terminal"? Or I need to use ...
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What is the name of the syntax for the "configure" interface?
When accessing routers/switches via ssh cli, I'm familiar with configure syntax but have never bothered to ask "what is it called?" As you might imagine, searches for router configure ...
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What device to use as an intermediary " Wifi Router" for a subnet, plug-and-play architecture?
I am new to network architecture so I apologize in advance for any nomenclature errors.
I have 50 IoT devices (running Ubuntu) that I want to stream significant data from. These devices are only ...
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noob learning cisco
I'm trying to teach myself how to use cisco devices. i was given an router, switch and firewall. so far i been able to set up vlan and have intra vlan routing working. My issue is having the switch ...
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Unable to configure Site to Site VPN between Cisco Router & Cisco ASA and permit SSH
I am performing configuration on Cisco ASA and Cisco Router from the packet tracer. I am attempting to allow the external network (172.16.22.100 255.255.255.0) to access the internal server which is ...
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Are integrated networking devices, frequently called routers, of the switch type or of a router / NIC type?
Odom,Wendell-_CCNA_200-301_Official_Cert_Guide,_Volume_1.pdf :
many SOHO Ethernet LANs today combine the router and switch into a single device. Vendors sell consumer-grade
integrated networking ...
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Switch ping to router with trunk port
If I have a switch port trunk directly connect to a router with the follow scenario below:
-------- g1/0/1 (Trunk) g1/0/1 |------|
|switch| Native VLAN 1 SVI=...
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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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Protect public network with virtual firewall w/o control over the gateway
I have a public network, 123.123.123.0/28, and a local network, 192.168.1.0/24. My ISP gateway for the public network is 123.123.123.1. My virtual firewall and router (pfsense) is running inside ...
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dot1q L3 router sub-interfaces and L2 switch ports
I have a router with multiple L3 sub-interfaces. On the other side I have a L3 switch (Nexus 9K) that I'd like to have multiple hosts that are on the switch route their traffic to one of the router ...
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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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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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Simple question about NAT [duplicate]
So I am learning about NAT. I understand that it changes IP from public>private and vice versa. From my understanding, when a packet or info gets sent to the public ip towards the private ip, ...
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How can a router know the MTU of the next router?
https://www.cloudflare.com/learning/network-layer/what-is-mtu/
Suppose Server A and Computer A are connected, but the data packets
they send to each other have to pass through Router B and Router C
...
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Communication between hosts on different local networks
I understand how NAT works in case of communication between one, local host and a server with specific public IP address. The host is sending a request, it pushes the packet with destination IP ...
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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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RMA'ed device configuration [closed]
Just wondering what are the methods that you use when re-configuring an RMA'ed device.
Do you manually configured all the script that runs on the device or is there any efficient ways configuring the ...
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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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how does a router know an ip address's network prefix when it comes to CIDR
Let's say I start a new company and lease a block of ip address 222.123.123.0/25 from Internet registry, so one of those ip address 222.123.123.4 is my main web server. A customer from a different ...
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DH groups support for isakmp policy
When configuring a site-to-site VPN tunnel between the ASA and Cisco router, I have queries around the ISAKMP policy. As per Cisco documentation for ASA, the crypto isakmp policy groups available are ...
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NAT configuration behind pppoe with virtual server
my CISCO 3925 router is handling pppoe, NAT, and DHCP server..
My local LAN is 192.168.1.x and it's behind that NAT.
I'm trying to enable access to a DNS server that's on this LAN (192.168.1.191 tcp/...
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Are all router ports both input and output or are ports divided in those two categories?
I've read that router input ports accept incoming packets and that output ports transmit the packets on the link.
However, a link can be used for carrying packets in both ways and in a router there is ...
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Direct connection slower than via switch
My office ISP provides a 1 GBPS connection. When I connect my laptop directly to the router provided by the ISP, and connect to fast.com, I get a speed of approximately 100 mbps.
Our office network is ...
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In what situations is MPLS label erased from the top of the label stack in MPLS?
What are other processes that MPLS/IP routers can do with, or to MPLS label stack?
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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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CISCO cellular Router cannot reach network via my PC
I configured the cellular and my router is connected to the internet ping (5/5) Success
but I still cannot access the internet via PC
Here is my running-conf
Current configuration : 2271 bytes
!
! ...
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What is PPP and why does it not have a MAC address?
I just wanted clarification on what exactly PPP is and why it does not have a MAC address due to having seen that under a response to a question of how routers transverse packets to their destinations....
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What ways are there to make sure router multicast tables are up to date?
I've been reading on IGMP v3 and think I understand the basics of how to join a multicast group - sending a Membership Report Message.
But I'm not sure what the "best" or even conventional (...
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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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