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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.

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What is bi-directional uri routing? [on hold]

I came across this term on an old Unmaintained repo, but I can't understand what it means.I have written simple web servers with multiple routes but I bi or unidirectional never crossed my mind.I don'...
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0answers
7 views

Transport package through tunnel from gateway to Server without changing source ip [on hold]

I have following Challenge: I have a dynamic IP (changes nearly every day) and want to have a static one. I need that static IP for some services and can't use dyndns or something on dns level. ...
2
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1answer
33 views

Running iBGP without IGP

Given following setup: Configuration of the routers is very straight forward. Router BGP1: interface Loopback0 ip address 1.1.1.1 255.255.255.255 ! interface Loopback9 ip address 9.9.9.9 255.255....
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0answers
19 views

How do hackers hain access to a network through IOT devices? [closed]

Suppose we have a a thermometer that is connected to a wireless access point. The thermometer is using MQTT protocol (which is easily hacked) and the hacker wants to access the complete network to ...
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0answers
6 views

Problem connecting to FTP through VPN after switch to new router (with identical network and port-forwarding settings) [closed]

I have a problem with the following setup: A friendly local business has a time stamp clock on site A. This clock provides data via an integrated ftp server. Also on site A: a Raspberry Pi 3 running ...
5
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2answers
112 views

How to architect a globally distributed website, from an IP address perspective

I would like to have a website that is loaded fast from any point in the world. From my understanding, you need to take advantage of the data center "regions" at places like Google Cloud or AWS. That'...
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0answers
30 views

Question about Switches [duplicate]

Routers exchange routing information to build routing tables to direct packets to their destination. Switches use the source MAC address from frames to build switching tables. Why don’t switches share ...
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0answers
41 views

Routing and Switching [closed]

Routers exchange routing information to build routing table and switches uses MAC addresses from frames to build switching table or MAC table. Why switches does not share switching table information ...
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0answers
8 views

Given an IP address and a subet mask, how do I find the max number of subnets and usable host IP's? [duplicate]

my question is based on an IP address and a subnet, how can I find the maximum number of subnets and the number of usable host IP address per subnet. This is all IPv4 if that helps. For example if I ...
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0answers
45 views

unable to ping from one vlan to another

Below mention is my scenario, i am newbie in switching. i am unable to ping from SW2 PC1 to SW2 PC3.Both the switch has same configuration. Please note that switch are layer 3 switches. Attached are ...
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0answers
28 views

Configuring two routers on my home network [closed]

A few months ago, I had a new router installed. The ISP took care of it. I'm not exactly sure how these routers are connected together. Pictured is the box (I'm guessing some kind of cheap switch) the ...
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0answers
47 views

RPL: questions on routing mechanism

I'm studying RPL and two questions came to my mind: 1: Both in storing and non-storing modes, if a node wants to send a packet to another node via P2P communication paradigm, then how does the ...
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1answer
51 views

How to change AD on Juniper router?

I have this route on my Juniper Router and some destinations have two routes: OSPF and BGP. I want to change the administrative distance for the BGP route so that it will be smaller than the OSPF ...
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2answers
40 views

How does pfSense control network traffic when plugged into a switch?

I apologize for this n00b question, but I'm trying to learn networking to help at a non-profit where the old IT guy is no longer there. They have several Cisco switches and one pfSense instance that ...
3
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1answer
74 views

Public and Private IPs

I wondered if someone could explain this to me. At work we have a firewall that connects to the Internet and has an external IP configured on it via DHCP. The firewall's WAN port connects to an ...
0
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1answer
67 views

How to explain that a route has two different AS numbers?

I have a question about the AS path, see the below example where I show the route 114.114.114.114. This shows several BGP routes. See the fist route item. The AS path is 4809 4134 I, I want to know ...
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1answer
54 views

What happens in Exstart state in OSPF neighbor state? Will DBDs be exchanged in that state?

According to my knowledge, DBD exchange happens in Exchange state.
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1answer
56 views

Installing a redundant system in parallel routing

I have a legacy automation system which will be replaced by a newer version. As an fallback option, the new system will be installed in parallel to the old one. But only one will be "in control". Due ...
0
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1answer
38 views

Routing in Wireless Ad-Hoc Networks

Let's say I have a mesh of sensors forming a wireless ad-hoc network. If one sensor wants to send data to the sink, it will transmit a packet via WiFi for example. My assumption is that there's no ...
4
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3answers
73 views

Why do all the intermediary routers need to run iBGP without tunneling?

I'm trying to understand the configuration behind iBGP - I understand you can run full mesh to prevent loops, run confederation or route reflectors, if you don't want full mesh, else run tunneling ...
1
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2answers
48 views

Can you tell whether a device is a gateway or not from its routing table?

When looking at a device's routing table, can you tell whether it is a gateway device between some networks or if it is not a gateway device?
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2answers
60 views

Finding a lost device

I have a device - an old printer I think - that is showing up in my traffic flows. It is from a decommissioned subnet (100.100.100.0/24). It is passing one of my network taps and triggering alerts. ...
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1answer
39 views

Is “gateway” a concept between two or more networks or a concept belonging to just one network?

Is "gateway" a concept between two or more networks or a concept belonging to just one network? When a device is connected to two networks, if it is listed as gateway in the routing tables of the ...
2
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3answers
160 views

Do all network devices need to make routing decisions, regardless of communication across networks or within a network?

From Hunt's TCP/IP Network Adminstration: Gateways route data between networks, but all network devices, hosts as well as gateways, must make routing decisions. Is it correct that routing ...
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4answers
72 views

Does a gateway need to be designated?

Does a gateway need to be designated? I thought a gateway between two networks is a device explicitly designated to be a gateway, out of several qualified devices connected to both networks. That ...
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1answer
48 views

Unable to Ping Past Firewall

I am trying to get communication across a firewall, but I am unable to ping anything past the firewall. PC1:172.16.201.22 <-> Router:172.16.192.1 <-> Firewall_Port1:10.10.10.4 <-> ...
3
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1answer
93 views

Advertise all static route except the default gateway with Juniper SRX firewall

With the following policy, all static routes are advertised via BGP to my neighbor: root@Nitrogen# show policy-options policy-statement bgp-export-policy { term export-statics { from ...
3
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1answer
92 views

Inter-VLAN Routing Issue

As you can see in below diagram regarding the Inter-VLAN between Server (VLAN 107) with The site in (VLAN 104)actually, we can ping all the inter-VLAN on the site. but we cannot browse some of them ...
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1answer
18 views

Can a hub be used for sniffing traffic from a device?

My intention is to analyze all network traffic which is coming to and originating from a network connected device I have. From the configurations of the device I am able to proxy all the HTTP traffic ...
6
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1answer
332 views

What does routing an IP address mean?

From https://stackoverflow.com/a/40189197/156458 Blocking 0.0.0.0 makes no sense. In IPv4 it is never routed. What does "routing" a IP address mean? Why is it the reason that blocking 0.0.0.0 ...
2
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2answers
62 views

Is static routing used in large networks?

I'm a beginner in networking stuff and just wondered if Static Routing has any use in large networks ? How about small ones ? In which cases we prefer to use static over dynamic routing ? I searched ...
2
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1answer
25 views

EIGRP unequal load balancing, variance command

Is correct to say that the value inserted in the variance command, lets say the value of "2" on a route that has a cost of, lets say "100", will unequally load balance all routes up to a cost of 200 ? ...
2
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1answer
76 views

EIGRP Auto-summary

One more question about EIGRP, EIGRP auto-summary what is the impact on the network ? i was reading about but it was not clear for me. And why is it a good Cisco practice to be disabled ? I am ...
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1answer
28 views

EIGRP metric claculation

I have a question regarding the EIGRP metric system. so if K1 is the Bandwidth and formula is : (K1 * BW + ((K2 * BW) / (256 - LOAD)) + K3 * DELAY ) * (K5 / (RELIABILITY + K4) Whats is BW and ...
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1answer
30 views

Packet tracer - why “show ip route” shows network address

This is just a quick question I am wondering out of curiosity. When I set up a network in packet tracer, why does "show IP route" show the network address (example: 199.120.5.64/27) and not the IP ...
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0answers
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Colocation network setup - 2 switches with each 1 uplink - redundant configuration question

I have a question about the network configuration when connecting 2 switches in a colocation rack via 2 uplinks (1 uplink to each switch) to 2 other switches of the datacenter itself. My topology ...
6
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1answer
269 views

Can non-recursive BGP route be used to determine next-hop for recursive BGP route?

In BGP recursive scenario, the recursive route is taking an unexpected next-hop. Here is the routing table: S* 0.0.0.0/0 [10/0] via 10.10.10.1, wan B 172.16.5.0/24 [20/0] via 172.80.80.1, MPLS, ...
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1answer
52 views

Allowing only routed traffic, block intra-VLAN forwarding

In a mixed network of Dell and HP/Aruba devices, we would like to block all communication between client computers, and only allow them to communicate with servers located on a different VLAN*. There ...
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1answer
33 views

What are the differences between packet forwarding and network address translation in layer 3?

What are the differences between packet forwarding and network address translation in layer 3? Is packet forwarding done by a router between two networks that use public IP addresses? Is network ...
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2answers
52 views

Do the Master/Slave Election happen in Broadcast Domain in OSPF? if not Why?

According to my knowledge, Mater-Slave election is needed to decide who will to start communication between two routers. In broadcast domains all the DR other routers communicate with DR. Is there a ...
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0answers
24 views

IS-IS Interface Metric/Cost Calculation Issue in Juniper MX

I am facing a very strange issue with regard to IS-IS Interface Metric / Cost calculation in Juniper MX. We have configured a reference bandwidth of 1000G on all routers.This by definition means an ae ...
1
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1answer
60 views

Understanding OSPF

In OSPF, what happens first, the SPF tree or the SPF algorithm? Once the LSDB is created does the SPF tree get created first and then the SPF algorithm runs or does the SPF algorithm run and the SPF ...
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1answer
41 views

Cisco ASA not passing traffic between two interface

I have Cisco 5506 with Security Plue License and following is my configuration. interface GigabitEthernet1/1 nameif inside security-level 100 ip address 10.0.10.1 255.255.255.0 ! interface ...
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2answers
103 views

How to block youtube url on a cisco router

How can i block youtube on a cisco router? I have already used class map as seen below class-map match-any url-block-class match protocol http host "*youtube*" ! policy-map block-class policy-map ...
0
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1answer
22 views

Static routes to a server in packet tracer

If a generic server with 2 NICs has been added to the network in "packet tracer 7.2.1" where NIC-1 is part of VLAN-1 and NIC-2 is part of VLAN-2 of a layer 2 switch. How to statically route incoming ...
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2answers
29 views

How does a router know it's received an OLSR message?

So I'm working on my own routing protocol based on a alternative to IP, called ILNP, and I'm having trouble understanding how a router differentiates control packets and data packets for OLSR. The IP ...
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2answers
78 views

Are network protocols and routing protocols different things?

When reading about network protocols it says they are a set of rules and format for communication between devices over a network, so basically an agreed way of how to communicate over a network. But ...
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1answer
40 views

How to change ip TTL=1 on flat network for security [closed]

Working on a network at an high rise apartment complex. They have a core router/firewall acting as dhcp server and about 7 switches (all l3 switches). They have a few vlans to segment traffic based of ...
3
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1answer
32 views

Juniper MX/SRX series interface monitoring command

Good morning all, I was curious due to an issue were currently troubleshooting in our environment if there is a command in Juniper that will allow us to determine the utilization percentage of an ...
0
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1answer
56 views

Unable to configure SR-TE (Segment Routing Traffic Engineering) in CSR 1000v

I'm trying to configure SR-TE (Segment Routing Traffic Engineering) in CSR 1000v IOS XE 16 using the official tutorial in here Segment Routing Traffic Engineering (SR-TE) I have the same topology in ...