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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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Linux equivalent of “no ICMP Unreachable” and “no ICMP Mask Reply”?

I have a Linux machine that is being used as a router. It has quagga installed and has ip forwarding enabled. It's forming an OSPF adjacency with a 3925 Cisco router. I being asked to ensure that ...
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0answers
6 views

iptables not working [on hold]

I have a NanoPi M1 Plus device with Ubuntu OS in it which I am using it as a router. The device is getting the internet via ethernet cable (eth0 interface) and the WiFi AP is provided via interface ...
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0answers
9 views

Securing J-Web interface with user lockouts after multiple bad login attempts

I have a bit of an odd question that I can't seem to find much success in getting an answer via web searching. I'm wondering if there is a way to secure the J-Web interface with user lockouts after ...
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0answers
4 views

Connect Netgear router R7000 to WAN-side using its Wifi antennas, LAN-side using its ethernet ports [on hold]

I have purchased an R7000 router specifically for the purpose. I wish connect Netgear router R7000 to WAN-side using its Wifi antennas, LAN-side using its ethernet ports. This is residential. ...
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17 views

Question DLink DVA 5592 boot not completed [on hold]

This is the log of my router that seems "bricked" https://paste.debian.net/plain/1055277 I got access to the DLINK console by using UART and 4 pin (VCCm GND, TX and RX). I can also open the CFE ...
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1answer
17 views

i cant configure the ip adress and subnetmask ,i only have one router “1941” and 2 pc's

the command line is this : Router0(config-if)#ip adress 192.168.1.1 255.255.255.0 the error message is : % Invalid input detected at '^' marker.
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2answers
51 views

IPv6 can't ping host when static route configured with exit interface

I have the following topology (using IPv6) interfaces: I have the following static routes configured on it: R1#sh ipv6 route static IPv6 Routing Table - default - 9 entries Codes: C - Connected, L -...
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12 views

Why the port is open using `tcping` to detect? [on hold]

Why the port is open using tcping to detect? I created a gateway in router, and such as, its IP is 100.100.158.254, when use tcping to detect it, there shows its 80 port is open. why ? because I ...
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0answers
6 views

why would a LAN transfer go slower when router is connected to network [on hold]

Before I ask, I realize the different hardware might be at play but I did some other tests that make me think its not the hardware and I wanted to ask to see if maybe there is something else going on. ...
3
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1answer
25 views

I can't set a gateway of last resort

I can't seem to get to set a gateway of last resort on a router. I want it to forward anything whom's ip address is not in the routing table to router HQ through interface s0/0/0 by doing the ...
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1answer
25 views

Cisco Embedded Packet Capture with NAT

I love the ability Cisco's Embedded Packet Capture (EPC) provides to remotely troubleshoot dataflows on IOS routers. monitor capture buffer CAP_BUF monitor capture point ip cef CAP_PT gig 0/0.1 both ...
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3answers
42 views

Native IPv6 load balancing

We have two software gateways (on Linux) for IPv6 that take fullviews from ISPs and announce our AS. And several nodes connected to Internet via the gateways. Something like at picture: And we ...
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1answer
29 views

Etherchannel configuration on two differents routers and 1 L3 switch

Is it possible to configure an aggregation etherchannel between two routers and one L3 switch, means that : the one link in : R1 <-> L3 Switch1 , and the second aggregation link in : R2 <-> L3 ...
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0answers
21 views

Testing isolated DR network from main network [closed]

So the procedure for testing our DR plan is to bring up recent replicas of our servers at a L3 connected WAN site - same names, IPs, etc. In the test plan (that was mapped out by someone who no longer ...
3
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1answer
46 views

Can't ping the management IP of Switch

My topology is: I am logged in to R1. I can ping 10.0.0.2 on R2 and 198.51.100.1 on R2, but can't ping the management IP of sw3 (198.51.100.2). What am I doing wrong? R1#sh ip arp Protocol Address ...
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1answer
31 views

Why command “ipv6 dhcp relay” doesn't work at packet tracer?

I'm trying to enable dhcp for ipv6 with the "ipv6 dhcp relay dest" command but, I'm receiving an error and I'm trying both of these commands but none work. Router model: 2811 (config)# interface [...
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1answer
29 views

Quagga router advertisement messages are wrong after an address change

I have a problem with Quagga OSPFv3 implementation. I have a Mininet topology with a host connected to a router. I assigned an IPv6 address to the router interface. And I enabled IPv6 ...
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2answers
84 views

How can two interface communicate between them with different subnet

R1 and R2 are connected with serial cable interface but both of them having different subnet and i know they will not communicate so what are other options two communicate between them without the ...
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1answer
32 views

Inter Vlan on L3 switch

I do an inter-vlan L3 switch lab on Eve-ng emulator. The topology like below And this is output from some show command at the L3 switch: Building configuration... Current configuration : 1422 ...
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1answer
38 views

How does a packet travel across multiple routers/subnets?

After reading various resources and examining the example below, the step-by-step process for a packet to travel the route below is still not 100% clear to me. I'm hoping to get clarification. Image ...
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1answer
21 views

All routes about a IP in my Router AS-PATH last AS number is Idle

I can not ping the IP 202.137.151.185 from my router. and in my router I show a IP's route, there gets the following information: admin@EE-MX-RE1# run show route 202.137.151.185 ...
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2answers
36 views

Can I scp a file to Juniper router's Console port?

When I try to scp a file to a router on its console port, it says: "lost connection" Is it not possible to share a file with the router on console port? If not, why?
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1answer
37 views

OSPF inter-area traffic - not so direct after all

a) Can I confirm inter-area traffic will be routed towards Area 0 / Area 0 will be the transit network for all inter-area traffic? b) Consider the diagram below q1) Does R1 receive Type 3 LSA for ...
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2answers
55 views

What's the difference between Ethernet link and Serial link?

Sometimes we see router connected use Ethernet link, sometimes use Serial link, what's the difference between them? and in what scenario we use them?
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2answers
32 views

If the Router's Gig0/0/0 to its Gig0/0/1, whether only cost one TTL value?

I have questions about the TTL value. whether the Router3 Gig0/0/0 to Gig0/0/1, there will cost one TTL? if the Router2 Gig0/0/0 to Router3's Gig0/0/0, will there cost one TTL? or do not cost? if ...
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3answers
1k views

Why is the BGP base on TCP 1027 rather than 179?

Why is the BGP foreign address port 1027? I use BGP to connect Router1 and Router2, but when I show the TCP progress: Router1>show tcp brief TCB Local Address Foreign Address ...
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0answers
25 views

Route traffic to internet from VPN Site2Site router client by ASA vpn server (Cisco)

I need help. I used this https://www.cisco.com/c/en/us/support/docs/security-vpn/ipsec-negotiation-ike-protocols/119425-configure-ipsec-00.html to create connection client vpn (cisco router) and ASA ...
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0answers
24 views

Whether the OSPF ABR Router's loopback network should announce to Backbone Area? [on hold]

The OSPF ABR Router whether its loopback network should announce to Backbone Area? the upper snapshot shows the C,D,E are ABR Routers, if everyone has its own loopback networks, I want to know ...
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0answers
25 views

Is there any method for checking Router with Server network speed?

I have a Server that have a low network speed. I want to find the crux of the problem of low speed. I want to test the Server between its Router's network speed. So, is there any way for doing ...
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15 views

Is there any rule for select the Net Link's ADV Router? [duplicate]

I have a topology like this: show ip ospf database OSPF Router with ID (2.2.2.2) (Process ID 1) Router Link States (Area 0) Link ID ADV Router Age ...
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1answer
42 views

What's the definition of Router Link and Net Link?

When I show the ospf database: Router2#show ip ospf database OSPF Router with ID (2.2.2.2) (Process ID 1) Router Link States (Area 0) Link ID ADV Router ...
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1answer
41 views

What's the relationship of a Router with its loopback interface in logic?

I have a Router1 with a loopback 0 connected to the Router2: the interface brief is bellow: Router1>show ip interface brief Interface IP-Address OK? Method Status ...
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1answer
54 views

Configuring multiple subnets with switch connected to single router interface

I have a design like this But I'm receiving a lot of mismatch errors and it doesn't work at all. I tried to ping 10.0.0.1 to no avail. I'm trying to configure the vlans on the switch 1 this way (...
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3answers
75 views

Why the OSPF router do not have neighbor?

I have two Routers in the Cisco Packet Tracer: Router2-1, Router2-2, Router2-3 all have their own loopback 0 with IP address 1.1.1.1, 2.2.2.2, 3.3.3.3. I only launched the OSPF progress in the ...
4
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1answer
185 views

Whether every router in a AS must have its RouterID?

Whether every router in a AS must have its RouterID? I know if a AS want to use BGP, the routers in the AS must have its own RouterID. whether a AS want to use router protocol, the routers must ...
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1answer
35 views

What's the difference between Router port and Switch port? [on hold]

What's the difference between Router port and Switch port?
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1answer
249 views

Whether the Vlan10 and Vlan20 in the Center Router are two virtual router interfaces?

I have a ISP 4321 Router in my Cisco Packet Tracer. and I added a NIM-ES2-4 module in the Router, that provides four switching ports. and now, I configured two VLANs to the two switch port of them. ...
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1answer
44 views

Is there any router port module of the Cisco Packet Tracer Router?

In the Cisco Packet Tracer: there are a list Routers, you can see such as 4321, 1941 and so on. but I tried everyone, there is no one have a module with multi router ports. there are switching ...
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2answers
59 views

The ISR 4321 only have two router ports

I have a ISR 4321 Router in my Cisco Packet Tracer, and I added a NIM-ES2-4 module, but the The NIM-ES2-4 provides four switching ports. which are Gig0/1/0 - Gig0/1/3. because I want to use the four ...
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0answers
19 views

How to set IPv6 RA values for RDNSS and DNSSL on HPE/Aruba 5400R

I am detail-planning the roll out of IPv6 in our company. Right now I am stuck with IPv6 RA on our HPE/Aruba Access Switches. I cannot find any documentation how to set the Recursive DNS Server (RDNSS)...
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1answer
42 views

Why RIP announce network does not need the mask?

The below is the RIP protocol's declaring the routing command: Router(config)#router rip Router(config-router)#version 2 Router(config-router)#network 1.1.1.1 Router(config-router)#network 192.168....
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1answer
53 views

Does the Router running multi routing protocol progresses received the routes will store into the Forwarding table?

I have a question about the Router running multi routing protocol progresses. if the bellow snapshot R1 have EIGRP and OSPF progresses, if the EIGRP progress received the routes from R3, will it store ...
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1answer
54 views

Does one logical router have only one route table?

If a router running several IGP, such as two EIGRP processes, one OSPF: Will all the IGPs processes' acquired routes be stored in the router's one and only route table or more? I mean, two ...
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0answers
21 views

MITM default gateway - packets differentiation

Assume we have the following actors in our setup: Computer A Computer B Router We set the necessary software needed on Computer B so he can act as router We set Computer A's default gateway to the ...
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2answers
67 views

How to assign all interfaces in one router to OSPF backbone area?

Is there any command to assign all interfaces in router (CISCO 2691) to OSPF backbone area? I was using this command for each interface. network address wildcard-mask area area-id Where wildcard ...
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2answers
47 views

Why Do we consider the serial connection between routers a subnet?

The image attached was included in a question where I was required to design the network f0r the classful network address 172.16.0.0, and it says that each circle represents a subnetwork. My question ...
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1answer
49 views

Quagga - Configure 3 routers using OSPF

Hi I'm trying to use quagga to connect 3 routers but the middle one doen't complete the path that a trace route command would do even though it knows where the target address is. It seems that ...
5
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0answers
75 views

How to control unwanted UDP traffic (Broadcast & Multicast) on Cisco Router 2911?

Please suggest, we are getting UDP traffic either broadcast or multicast in router 2911 which cause 95%+ utilisation of the router. And we got error in link and business impact due to this. Company ...
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2answers
36 views

How can the Cisco Packet Tracer show the port's name?

How can the Cisco Packet Tracer show the port's name? the GNS3 can show its interface name.
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1answer
530 views

What's the role of Router/Switch name number?

I have a CGR1240 Router in Cisco Packet Tracer: I have a question about the name of port. I have no idea about the name number of a router/switch port. why there is 2/* in CGR Router? such as ...