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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15 views

Suspicious Network Activity [on hold]

A few weeks ago, my work network lost its reliability and some of the machines have access issues. For example... Currently, I cannot access https://windows.php.net from a laptop connected to the ...
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11 views

Why won't Cisco Catalyst 1760 Router enter rommon?

I have purchased a Cisco Catalyst 1760 Router. It has the password recovery turned off and there is no reset button. I am using ctrl+break in putty on windows to break and it has given me the question ...
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41 views

How do VLANs Work? Some Basic Questions:

I've recently started looking into VLANs. I am a network novice so bear with me please:). I have a few questions regarding VLANs. I understand that certain managed switches allow you to create VLANs. ...
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How to set up secondary home WiFi network [closed]

I have a Google WiFi Mesh system at home. It's powered by my Xfinity modem/router combo in which I disable the WiFi on. Everything works great. I have lightning-fast speeds across my entire house. ...
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7 views

Access router configured as bridge [closed]

A couple of years ago, I configured a router as bridge (Asus), and now, I want to use it as my main router, since the one given by my ISP sucks (ZTE). So I connected to it through wifi, I looked up ...
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Ideal wifi setup for a meetup [closed]

I am organizing a multi day meetup for about 20 people, and i expect average of 2.5-3 devices per person, so about 50-60 wifi devices in a hall. The venue has wifi (not professional grade) so just to ...
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11 views

I want to know about mac spoof [closed]

I have done ip and mac spoof to my isp. It runs on static ip. Two device is connected on same lan i mean two router. Then im facing packet loss. If i change my subnet mask different from the other ...
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2answers
59 views

Why are there so many more dual-band (2.4 & 5 GHz) Wi-Fi APs than single-band, 5GHz-only ones?

Why are so many more dual band (802.11n 2.4GHz & 802.11ac 5 GHz) APs than single-band, 5GHz-only ones? Is this for backwards compatibility?
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Connect To Home Router Which Is Itself Connected to a VPN [closed]

I have to believe someone has asked this question before, but I can't seem to find any information on it. This is probably because I'm not searching with the right words. So, here goes nothing: I'd ...
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1answer
27 views

Does every router in public network knows all the other public interconnected networks in the world?

I am reading this article https://www.practicalnetworking.net/series/packet-traveling/host-to-host-through-a-router/ , trying to learn how a packet is delivered between different networks. It says: ...
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26 views

Hide SSID to block probe requests from clients

According to this Answer clients are sending probe requests to discover wifi networks. If I hide the SSID the AP wouldn't need to handle these probe requests and therefore the workload would be lower....
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How to access the router in front of my networks router? [closed]

Okay, so here is a short description of the network in our house: (1) FritzBox - connecting to the internet and also the rest of the house. (2) D-LINK Router running OpenWRT - the hardware firewall ...
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58 views

Does a router send its own mac address or the mac address of the user?

When a request is made, does the router send its own mac address or the mac address of its user? Does it send the mac address at all? My specific case is the following: I am getting a 4g sim card to ...
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45 views

Can a router route 2 switches with multiple vlans and subnets

Good afternoon/evening, Today on my Cisco Packet Tracer, I made two layer 2 switches and 2 PCs on each switch. I created a vlan 10 on the switches. I trunked the switches together so they can see ...
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11 views

Why we need routers when there is layer 3 switches [duplicate]

I know that routers only do routing but layer 3 switches can do both switching and routing. my question is why we still need routers when we have layer 3 switches ?
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1answer
26 views

Modern routers: number of NICs, ports and mac addresses

I read that NICs in modern routers are responsible handling of multiple ports. Is it true to say that every port has a different MAC and IP address, and thus a NIC might have multiple different MAC ...
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38 views

Using 2 different ISP In case one dies

It's my first ever post in here and I hope not the last. I'm looking for some advice. I'm trying to reduce my internet downtime for a local network. My setup. Mix and match computer environment (...
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1answer
21 views

Router RIPv2 displaying subnets not directly connected

Is there a way to show subnets on "Show IP route" that aren't directly connected, but are a hop or 2 away? Is this with Router RIPv2 "redistribute" or is there another way? Thanks
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1answer
39 views

Upgrading Cisco 819 to 809, can I connect devices to 2 routed ports and be on same subnet?

The company I work for has multiple remote "IoT" style sites connected back to the datacenter via a Cisco 819 cellular router. We are in the process of upgrading these to the newer Cisco IR809 routers ...
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2answers
262 views

Router on a stick not connecting 2 different VLANs

I have a setup which requires two different VLANs to be able to ping one another. I have a setup with 2 - layer 2 switches and a router that has defined sub-interfaces, and for the life of me, I ...
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13 views

Small Network Router Recommendation [closed]

I'm looking for some thoughts from those of you with some expertise on small-network design. My home / business network consists of: Two 16 port switches (TP-Link TL-SG1016) One 8 port powered ...
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1answer
60 views

If you're behind a firewall and all the ports are blocked, how is your browser able to access the internet?

I'm behind a router and I'm able to run game servers on my home computer after forwarding ports or using the DMZ feature on the router. However, I still don't understand the underlying technology as ...
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44 views

Reasons for buying ASN for organisation that are located at single place

I see here that even some organisation/universities have bought ASN which are located at single location. What benefit they will get by buying ASN ? Is it compulsory to buy ASN if I have to buy some ...
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1answer
36 views

802.1ad (QinQ) and router

I am a little bit confused. Is router aware of VLAN tag? What happen when tagged frame comes to router? (without any extra setting like encapsulation) Or what happen when QinQ frame comes to router? ...
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31 views

What is benefit of allocating ASN to edge routers and not Ip addresses

What is benefit of allocating ASN to edge routers and not Ip addresses ? I mean we could have given these edge routers unique public ip addresses too ?
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1answer
46 views

I need help in creating OSPF between MultiLayerSwitch and Routers in packet tracer

I know we cannot create OSPF with different subnets. What network addresses should I put in the MLS and R1 to make it adjacent? Here's the configuration for MLS: interface FastEthernet0/15 no ...
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35 views

How to change Default Gateway on Hitron (Virgin Media) router?

Our office is having connection issues with Slack. Our internet provider is Virgin (UK) and the router is the Hitron CGNV4, and Virgin suggested that a reset using the button on the back of the router ...
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257 views

Why ip nat {in,out}side?

Although I understand how NAT is configured on Cisco, a broader question came up about the why behind it. When configuring e.g. NAT overload, you specify a few items: An access list ... ip access-...
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42 views

Trying to understand how SSH works [closed]

Hi I have a network diagram as shown in here both Router0 and Access Point0 have DHCP servers on It I am thinking about How to open SSH to my Access Point0 from Server0 , Only IP address I could get ...
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1answer
42 views

Cisco SMB Switch Configuration for VOICE VLAN and DATA

I am hoping to get some assistance with a current issue I am facing at the moment... I have 3 Cisco SMB Switches, (2) SG300 Managed Switches and (1) Unmanaged Switch. SWSG1 | 172.16.1.100 | Port 24 ...
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40 views

Cisco 1841 stuck on boot?

I found an old Cisco 1841 router and decided to boot it up to play with it a little. Everything seemed to be going ok but I guess something interrupted the boot. Last line is %SYS-6-...
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1answer
51 views

What is a meaning of Load balancing Hash

What does Load balancing Hash mean in CEF? Which commands are use to configure? Is it support to other vendors except Cisco? If it is not support other vendors? do they have any similar concept? Which ...
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1answer
67 views

What's the difference between DHCP Disabled or Relay on an access point?

I am trying to turn my old router to an access point for the new router, I assigned an IP address in the range of the new one and when I went to disable DHCP there was another option which is Relay ...
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58 views

why doesn't WireShark show any traffic from invalid certificate https site? [closed]

i have tried mobile apps like HttpCanary and pc programs like wireshark still got nothing from the site !!
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21 views

confused in incoming and outgoing vc number

When filling out the forwarding table for VC, how is the incoming VC number deduced? what is the trick? For example in the diagram shown how are the incoming and outgoing VC numbers found out for a ...
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15 views

what is difference between main ring and sub ring in ERPS?

According to my knowledge , we can configure multiple ERPS rings in service based. But there is a concept of main ring and sub ring.Please explain significance of each.
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1answer
57 views

Is OSPF router ID unique per area?

I found online that the router ID must be unique within the OSPF domain. But what exactly is an OSPF domain (an area?). Let's take the following topology: Can R1 and R5 have the same router ID, as ...
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1answer
115 views

What is the purpose of a switch routed port?

From my Cisco CCNA documentation: Routed ports are used for point-to-point links. Connecting WAN routers and security devices are examples of the use of routed ports. In a switched network, ...
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1answer
36 views

How to use IXIA IxNetwork 8.40 to send bi-directional traffic between CPE and router

My setup is: IXIA -- CPE -- router -- IXIA I have one end of the IXIA connected to CPE, and getting private IP (DHCP from CPE). Other end is connected to router side and has public IP. Traffic ...
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86 views

Is a “LAN” a layer 2 or a layer 3 concept, in TCP/IP?

I think my question is purely theoretical and a matter of definitions; it derives from the fact that a L2-switch with VLAN capabilities is able to "create" different virtual LANs, and thus I am led to ...
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1answer
47 views

SNMP object not in the MIB

i'm working on an SNMP app that needs the ptopo MIB object with the object ID of 1.3.6.1.2.1.79 after enabling SNMP v3 on 2 layer 3 switches dell z9100-on brocade slx 9140 and creating a view on ...
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75 views

Layer 2 and Layer 3 traffic with one cable

Hers the topology. L2 switch L3 switch Router There are 2 VLANs. One VLAN ends on the L3 switch 1 VLAN on the router. Here is the question. Can i connect the L3 switch and the router with just 1 ...
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2answers
39 views

How to configure snat between 2 private networks having different nat pools?

Hi, i'm having some problems with the current configuration i have on this network. I have two nat pools one for the blue square routers, and another for the yellow ones. And i'm using snat to have a ...
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27 views

Whether all the edge router has the CERT `Advisory CA-1996-21` process up? [closed]

Whether all the edge router has the CERT Advisory CA-1996-21 process up? We know after the DDoS attack of Panix at 1996.9, the CERT release the CA-1996-21 announcement. it is take effect of edge ...
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2answers
52 views

How to configure NAT between 2 private network ? CISCO routers

If anyone can help with configurations it will be helpful
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2answers
34 views

How many public static ips do one need if a PC is behind a wireless router?

If a PC is connected to internet through a wireless router. How many public static ips do one got to get from the ISP. Do the router and PC both require one static IP. What if I want to add more PC ...
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1answer
23 views

LAN to LAN Connectivity of Moxa routers

I am with background of DevOps and to optimize stuff in office i am assigned a networking task with not much experience of networking. My scenario is like below I have two moxa (EDR-810) routers ...
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18 views

Are there NATs which will block any further incoming packets from a peer after rejecting first one?

I'm attempting to test udp hole punching. Right now I'm simply testing how my computer reacts behind a router. If I send a udp packet from my computer to a server, it can reply back on the same port ...
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2answers
58 views

How to cascade two routers [closed]

When I connect two (Zyxel) routers in a cascade configuration, I don't know how to set the right address on the Lan Interface between the outer router (the one on the top of the diagram) and the inner....
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1answer
59 views

My Juniper Router arp do not work, after clear MAC then it can work

In my MX Juniper router device, there have the IP 16.213.40.1's address: {master} admin@juniperMX> show arp no-resolve | ...