Questions tagged [routing]

For questions about routing, the process of selecting to which network path traffic is sent. Consider using a more specific tag if your question is about a routing protocol like BGP or OSPF.

Filter by
Sorted by
Tagged with
0
votes
1answer
7 views

In gnss3, why can't I ping my cisco router from my VM?

I have the following network, I have never configured a Cisco router before so I'm having a little trouble. In router R1 I used the following commands to assign an ip to the router: configure terminal ...
1
vote
6answers
802 views

How to setup self hosting with redundant Internet connections?

The situation is this: a small broadcasting company is going to have multiple remote cameras sending live video back to the company HQ where they have the hardware to produce the live stream sent to ...
0
votes
0answers
8 views

Issues in port forwarding/ Firewall rules [closed]

So i am having some issues with a lab network I have the follwing configurtaion: Default gateway: 10.4.10.1/24 (Connected to External network) Router: 10.5.10.1/24 - running on DD WRT firmware Server :...
1
vote
1answer
31 views

How to block telnet access for one particular network from all networks except one using Extended ACL

Scenerio is given in the picture. I want to block all the networks except 192.168.5.128/25 from doing telnet of 192.168.5.0/25.
2
votes
2answers
497 views

Cisco 2960 not receiving dhcp from the router

I have a problem with Dhcp of some the Vlans. here is how my network is : I have a router ASR1001, which connects 15 switches(2960) as a ring topology. each switch has a subinterface of the router ...
7
votes
4answers
4k views

Why can't a single port be used for both incoming and outgoing traffic?

I'm trying to understand something related to network ports, as it's not quite clear to me. The question is, why can't you use the same port number for both incoming and outgoing traffic? This ...
1
vote
2answers
429 views

Ping issue: connect a switch into another switch's vlan port

I have a Cisco 2960-X switch and a Cisco SG-300 switch. I created VLANs on 2960-X switch (e.g. VLAN 10 with ports 1-5 and VLAN 20 with ports 6-10) and allow DHCP for each VLAN. Now, laptop 10.10.1.2 ...
1
vote
2answers
295 views

Packet transfer from one host to another

I was reading about how a packet is send from one host to another. I am confused about entries that will be made in layer-3 switch routing table. Does it contain the entries for layer two switches or ...
1
vote
2answers
318 views

Do I need to add a route for each subnet beyond the subnet I've routed to?

Do I need to add an IP route for all subnets past the subnet I've routed to? For example, from R1, do I need to set up a route for .64, .112, .128, .80, .144, .160, and .96?
2
votes
4answers
1k views

Private IP inside internet?

Firstly sorry if this question has already been asked. While playing with traceroute, I came across something really strange... traceroute to 185.75.143.25 gives: - 10.214.255.254 - 10.255.255.254 ...
0
votes
2answers
52 views

Adding a private network - basic question

This may seem obvious but after searching can't find an answer. I have built many smaller networks using static IP addresses where the default gateway is the router going to the internet. I would ...
2
votes
2answers
831 views

Allow port 8080 in on Cisco 1841

Having problems configuring an 1841 to allow outside access in mapping some ports to internal addresses. Need to allow the following: External IP: port 8080 to 192.168.3.50 External IP: port 8081 to ...
1
vote
4answers
439 views

How to practically measure end to end delay

So i have 5 nodes A,B,C,D,E. A client, E server, rest are routers, and i would like to measure end to end delay between A and E. The only solution i can come up with is taking a time stamp in A, ...
1
vote
4answers
261 views

How to Control Routing Table from exceeding its size theoretically or practically

I understand that switches learn from incoming traffic and thus builds its switching table. Does that also apply for routers? If so, how routing table can avoid increasing the routing table size since ...
1
vote
3answers
369 views

How are packets routed based on IP and how are those routes acquired?

Good day all, this is my first question here, be gentle in judgement Background: At university, we are covering Network Routing Protocols. Having possibly found 2 issues with current routing ...
1
vote
3answers
492 views

Subinterface in cisco router

Quick question - I was learning about subinterfaces and using Cisco Packet Tracer I wanted to create simple network with two computers (every in different networks (192.168.1.1/24 and 192.168.2.1/24 ...
1
vote
3answers
4k views

What are the advantages of a firewall over a Layer-3 switch?

From my understanding, a Layer 3 switch can handle cross-communication between separate LANs and VLANs, as well as fine-tuned ACL control between VLANs. Despite this, I know a Layer 3 switch should ...
1
vote
3answers
2k views

How to configure static routing between two layer 3 switches?

I have two Cisco layer 3 switches. In switch 1, I created two vlans, 10.10.1.0/24 and 10.10.2.0/24. The connection is shown in the figure. PC 1 and PC 2 have static IP address (10.10.1.5 and 10.10.2....
1
vote
2answers
106 views

Packet tracer networks

I have been tasked to build a network on PT which involves 4 subnets and they are all connected via one router using serial cables any ideas on how i can do it. That one router is acting as the ...
4
votes
5answers
1k views

Choosing a routing protocol

I have always wondered what causes an network engineer to pick EIGRP or OSPF over the other. Obviously OSPF is opened standard so can be used in a multi-vendor environment. If all equipment was cisco, ...
1
vote
2answers
2k views

Inter VLAN with layer 2 and 3 switch

Is there a way to interconnect VLANs using this diagram? MLS0 has this configuration: interface FastEthernet0/1 switchport trunk encapsulation dot1q switchport mode trunk And SW0: interface ...
1
vote
3answers
3k views

Juniper EX how to clear route forwarding table?

After layer 3 routing a large IPv6 assignment on an EX Juniper switch, the route forwarding table filled up and some entries corrupted or became otherwise invalid. We want to clear the whole table. ...
0
votes
0answers
6 views

Ping returns different IP address if connected to router via Ethernet versus WiFi [closed]

I have a single laptop connected to a router which is connected to the internet. If I connect the laptop to the router via WiFi and then start a VPN and then ping a device name on the VPN network I ...
1
vote
2answers
182 views

Understanding static routes

I have seen this static route in one of the interfaces of the router: ip route vrf vrf_45065 1.1.1.1 255.255.255.255 172.22.145.153 2 ip route vrf vrf_45065 10.158.138.192 255.255.255.192 172.22.145....
0
votes
2answers
581 views

Static Routes between two routers

I've currently at a bit of a roadblock. The scenario is i have two sites approx 5km apart. Each site consists of multiple levels, now i have set up VLANS at both sites, and each PC can ping each ...
1
vote
2answers
261 views

Forwarding communication between two ports on switch

I have an industrial network with ring topology, consisting of a number of dumb switches and one manageable switch (Siemens OSM 62) acting like a supervisor. But now I would like to add new switch to ...
2
votes
2answers
42 views

How to distinguish a traffic that belongs to specific service

Suppose I have a server running different services, say Email exchange, storage space, web server, and SQL database. Assuming this server is bounded with one IP address and one NIC card, how can I ...
4
votes
4answers
6k views

Layer 3 Switch Routing vs Router on a Stick

CORE: Dell N4032 (6.3.0.18) Access: Dell N2048 (6.3.1.13) We are in the process of setting up a serviced office that will serve multiple businesses. Each "customer" will naturally be on their own ...
1
vote
2answers
412 views

Can't ping Linux hosts on a certain subnet unless core router pings them first

We are making some changes to our network and after changing which router we use as our core router, there is a strange problem. The problem is that there are two subnets (out of a total of more than ...
1
vote
0answers
17 views

Why did the IANA specifically choose these ranges for the the private IP address space? [closed]

10.0.0.0/8 IP addresses: 10.0.0.0 – 10.255.255.255 172.16.0.0/12 IP addresses: 172.16.0.0 – 172.31.255.255 192.168.0.0/16 IP addresses: 192.168.0.0 – 192.168.255.255 Is there any reason behind ...
2
votes
2answers
1k views

Parent Interfaces and Sub-interfaces

Quick question for a network ninja.... Say I have four sub-interfaces on a router (not a layer 3 switch). Each interface has already been configured and each sub-int is a /23. Now, the parent ...
2
votes
4answers
226 views

Cisco cross-vlan routing

I have the following config snippets on a layer 3 switch: ip routing ! interface GigabitEthernet1/0/22 switchport access vlan 51 switchport mode access ! interface GigabitEthernet1/0/23 switchport ...
2
votes
4answers
124 views

Does a Business Router from an ISP perform actual routing or only Network Address Translation (NAT)?

Let's say that the professional business router is connected to the Internet through the WAN port and has some devices in the office connected through the other ports. The devices in the office ...
-1
votes
3answers
85 views

Is “port-forwarding” used just for comfort?

If I can easely bind some computer in internal network to a port on the router by code - so its right to say that we need "port-forwording" only for cases that it easier to us then build a new ...
4
votes
5answers
180 views

Need of routers and IP addresses

I dont know if my research is enough or not but I could not find answers on the net. My question is why not use bridges instead of routers. We know bridges can connect two different networks. Using ...
4
votes
3answers
239 views

Router configured (intentionally) with no default routes?

Would one ever find a router that had been intentionally configured to not have any default routes? No default gateway, no 0.0.0.0/0... Sort of an academic question, someone at work mentioned it, and ...
3
votes
4answers
3k views

How can multiple devices share an IP across the internet?

I do realize that most LANs sit behind a device running NAT, which translates the users private IP address to a public IP address. My question is still if you are trying to connect to a private device,...
2
votes
2answers
127 views

connecting two ISPs to my network

Hi My network has the following resources: 3 ASA-5505 w/site-to-site VPN's newly acquired c801F-K9 router Exchange Server 3 ISP's (soon to be 2) A t-1, DSL, Satellite. VOIP Cisco Cme My goal is to ...
1
vote
3answers
205 views

Active\Passive Routers w\ BGP

What I'm trying to do is take two routers, "A" and "B" where 'A' is the primary router. Just like with active\passive firewalls and HSRP I want to "float" the default gateway between either Router A ...
2
votes
2answers
2k views

Routing between vlans with two routers

I'm making a simple exercise to understand how to route between vlans. I have this setup, a router in the top where routing occurs and three vlans. I've created the vlans and added encapsulation for ...
1
vote
3answers
2k views

How to create separate network on different interfaces on Fortinet 200d and route bettwen them?

Fortinet 200d has 8 internal (LAN) interfaces, but there is no way in the GUI to modify specific interface. For example: int1 of int2 on int3. They are all under one internal LAN interface. So, how ...
2
votes
4answers
3k views

Port numbers and private IP addresses in Port Address Translation

Sorry for my limited knowledge in Networking. If I understand correctly port numbers are application level addresses for network communication, e.g. port no 20 is assigned for FTP. In PAT, we map ...
4
votes
2answers
2k views

the meaning of static routes and next hop

i configured a network topology on cisco packet tracer to learn about the static routing, as shown in figure below i spent a lot of time to ensure the connectivity between server0 and server2(cause i'...
2
votes
2answers
107 views

How to reach a particular destination in LAN

I'm quite new to networking, just learning the basics. I have a doubt, hope you can solve it. Suppose I have a LAN ip 192.168.0.103 and I have a public IP of 66.249.79.122. Now I have read that ...
0
votes
2answers
508 views

Do I have to reboot the Fortigate 1000c after modification on static route?

I am using a Fortigate 1000c working on NAT mode. It has two WAN connections (WAN1 and WAN2). I am using a static route. For some reasons, There are many firewalls and routers (Cisco, TP-Link and so.....
1
vote
2answers
1k views

Two Gateways on a single network - VPN into 1 gateway, but limited access

I have two gateway routers as I have two different internet providers, I have one for high speed/normal use (Gateway 1), and the other slower speed, but dedicated IP's (Gateway 2). It is all working ...
1
vote
2answers
353 views

How to configure VLAN?

I have simple tree topology network. I want to configure VLAN on this network, PFA the image. Am I wrong? Can VLANs actually be configured like this. I have setup this topology on mininet. More of ...
1
vote
2answers
53 views

How to make routing on edges of a router in center of OSPF routing?

Lets says I have 3 routers: R1, R2, R3... All three communicate with OSPF (with authentication and all) ... R1 <--> R2 <--> R3 Now I have R4 on one side of R1 ... R4 <--> R1 <--> R2 <...
2
votes
3answers
3k views

How to make two Cisco switches talk to each other

I have a layer 3 switch with multiple VLANs. I created a trunk port that connects to a layer 2 switch. I can now successfully access the layer 3 switch VLANs from an access port on the layer 2 ...
3
votes
3answers
27k views

Why can't devices in different subnets talk with each other?

I know that the layer 2 doesn't understand IP, and the broadcast domain is same. Why can't devices talk, how does it happen?

1
2 3 4 5
39