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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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How is the packet processed in switch/router? [closed]

The architexture I believe is used (could be very wrong so please correct if incorrect) Packet comes in the interface and queued in the input buffer of that interface then according to the scheduler ...
Karan Patel's user avatar
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0 answers
6 views

Wired router for network monitoring [closed]

I am trying to set up a monitoring capability on my children's and nephew (computer wiz who is visiting for the summer) internet connection. I need it to do two basic things at minimum, a) Monitor net ...
user25236026's user avatar
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0 answers
11 views

Accessing a computer connected to a phone via USB tethering? [closed]

So I have two devices, a laptop and a desktop. I want to be able to Remote Desktop from the laptop to the desktop. My home router is connected to a phone, and the laptop. The phone in turn connects ...
Ayush Bhatt's user avatar
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0 answers
48 views

Setting up a professional hotel grade wifi / internet connection? [closed]

I'm contracting individuals to install a professional WiFi network for a five-unit Airbnb property. This includes configuring 5 Ubiquiti WiFi 6 access points, a Ubiquiti WiFi controller, and a 24 POE ...
Jeff Palson's user avatar
2 votes
1 answer
60 views

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 ...
user94393's user avatar
3 votes
1 answer
88 views

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, ...
Jawsont's user avatar
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-1 votes
1 answer
64 views

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. ...
Shadi's user avatar
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0 answers
13 views

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 ...
Justin Time's user avatar
-1 votes
1 answer
25 views

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 ...
Xavier Lim's user avatar
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1 answer
26 views

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 ...
SEPEHR's user avatar
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1 answer
69 views

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 ...
mohdh34m's user avatar
0 votes
1 answer
53 views

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 ...
ishunsei's user avatar
1 vote
2 answers
124 views

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 ...
Глеб Щеголев's user avatar
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38 views

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?
SEPEHR's user avatar
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2 votes
1 answer
137 views

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 ...
Ali's user avatar
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1 answer
75 views

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 ...
user3840019's user avatar
0 votes
1 answer
108 views

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 ( ...
Mihai's user avatar
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-1 votes
2 answers
61 views

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 ...
Mirek's user avatar
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1 vote
2 answers
131 views

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 ...
Josh Hibschman's user avatar
0 votes
1 answer
52 views

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 ...
Michael Kaca's user avatar
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0 answers
58 views

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 ...
Stu Villanti's user avatar
0 votes
1 answer
35 views

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 ...
iloveearth_12345's user avatar
1 vote
1 answer
136 views

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 ...
John Smith's user avatar
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1 answer
126 views

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=...
Andrew's user avatar
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0 votes
1 answer
47 views

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 ...
Renivle's user avatar
0 votes
1 answer
43 views

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 ...
Demiler's user avatar
0 votes
1 answer
273 views

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 ...
Terry Grace's user avatar
0 votes
1 answer
76 views

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 ...
vincenzogianfelice's user avatar
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0 answers
55 views

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 ...
Mitrixsen's user avatar
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0 votes
1 answer
42 views

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, ...
yea im a noob's user avatar
2 votes
2 answers
242 views

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 ...
NIOI's user avatar
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1 vote
1 answer
209 views

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 ...
Bratw's user avatar
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0 votes
1 answer
43 views

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. ...
Anjil Khadka's user avatar
0 votes
2 answers
34 views

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 ...
dlareg28's user avatar
0 votes
0 answers
211 views

Why Fast Ethernet port in Cisco Packet Service is always down?

I built a simple network simulation with Cisco Packe Tracer. I am not able to understand why fast ethernet port Fa0/0 on server Gmail and correspondent port on Router2 are always down. I checked and ...
Giancarlo's user avatar
0 votes
1 answer
384 views

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 ...
eccentric learner's user avatar
1 vote
1 answer
79 views

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 ...
whoisit's user avatar
  • 111
0 votes
1 answer
242 views

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 ...
Blake's user avatar
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0 votes
1 answer
81 views

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/...
Turgut Kalfaoglu's user avatar
0 votes
4 answers
471 views

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 ...
DataType's user avatar
0 votes
3 answers
206 views

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 ...
ranban282's user avatar
1 vote
1 answer
64 views

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?
Vladimir Pejanovic's user avatar
3 votes
2 answers
362 views

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 ...
scriptboy's user avatar
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1 vote
1 answer
74 views

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 ! ! ...
breka's user avatar
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1 vote
1 answer
356 views

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....
N.C.'s user avatar
  • 13
0 votes
2 answers
59 views

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 (...
Andreas's user avatar
  • 115
1 vote
5 answers
101 views

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 ...
jiwopene's user avatar
  • 113
1 vote
2 answers
386 views

If there's a NAT-capable gateway between WAN and a switch, why is a switch helpful?

To preface this question, my question is somewhat related to what I'm trying to understand as the difference between layer 3 switches and routers. The main difference between the two is that layer 3 ...
itsmarziparzi's user avatar
1 vote
1 answer
486 views

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 ...
itsmarziparzi's user avatar
0 votes
1 answer
149 views

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 ...
snatchysquid's user avatar

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