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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Unable to ping switch

Why can't i ping S1 from PC-B, but it's possible to ping PC-A? S1#show running-config Building configuration... Current configuration : 1638 bytes ! version 16.3.2 no service timestamps log datetime ...
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1answer
61 views

What does it mean when default route is to a network address?

The default route as configured in a Cisco router is as shown below: Gateway of last resort is 103.0.0.0 to network 0.0.0.0 What I have came across so far is that the gateway of last resort is ...
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[SOLVED]Tunnel is not reachable on it's own subnet [closed]

I have created a subnet. IP Route table looks like this: 100.69.0.1 dev ppp0 proto kernel scope link src 100.69.29.138 // isp stuff 192.168.0.0/24 dev br0 proto kernel scope link src 192.168.1.1 ...
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Is there a way to find out the number of routers in my office network? [closed]

I am connected to a private network in my office. I would like to find out the number of routers in the network? Used the terminal commands to check the routing tables but unsure how to select the ...
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What is the first and last address of a subnet? Is it the Network/Broadcast or the First/Last usable address? [duplicate]

For a computer science exam the question was: Find the first and last address of the subnet containing XXX.XXX.XX.XX/XX I put the network and broadcast address and got it wrong. Those who put the ...
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18 views

What kind of technology did the ARPANET utilize prior to the invention of routers? [closed]

My question is simple. Routers were invented in 1981. What kind of technology powered the ARPANET prior to routers?
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Why I can't ping my switch Vlan99?

In the following network, I have configured every device but somehow I can't ping my Customer-PC and Technical-PC to PasirGudang-SW and Segamat-SW. The PCs can ping the other ip address just fine ...
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13 views

Network switches and router integration [closed]

I have more than 70 users in my network. I just need to give them internet access. 56 will be in lab are their working nature will be same. Rest of the user belongs to HR and other departments and can ...
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1answer
42 views

BGP route advertised but cannot Ping

I have this rather basic setup with 3 routers running BGP, each has Loopback int configured. Is there an extra step required for R2 to ping R4 Loopback interface despite it's being advertised? R2#sh ...
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Understanding Excerpt from AWS MPLS Whitepaper [closed]

https://d1.awsstatic.com/whitepapers/Networking/integrating-aws-with-multiprotocol-label-switching.pdf I'm reading the following whitepaper and I have trouble understanding the following paragraph, ...
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3answers
44 views

BGP-OSPF route injection doesn't work

Background: BGP is fully functional and works as expected so nothing need to worry about, the problem is the route injection between HK_Office <> HK2 and LON1 <> LON_Office, as you could ...
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DATA & VOICE VLAN ROUTING BETWEEN 2 ROUTERS [closed]

Good Afternoon All- I would appreciate a little help with a current issue I am facing... I can ping all Network Segments, all Routers, all Switches, and all Servers on the network. PROBLEM IS: I CAN'T ...
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3answers
226 views

If router operate at network layer, how does router change data-link header and trailer between data-link header and trailer between LAN and WAN?

Refer to figure 6-9, the CCNA Official Cert Guide 200-301 Volume 1 illustrates that, to send a frame through WAN, router R1 changes frame header and trailer. However, as router operate at network ...
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1answer
31 views

What is difference between Route object and AS-SET object in RIRs?

In what case,we need to create AS-SET objects in RIRs. If i have to advertise a prefix from different ASNs in different region,do I need to create as-set object?
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Is packet transfer still possible, if the routers don't have the updated link cost information in the Bellman-Ford Algorithm?

In the Bellman-Ford Algorithm, the principle of "Good news travels fast but bad news travels slow" is implemented. So if the cost of the link between two routers is increased, then the ...
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2answers
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Concurrent site-to-site VPN tunnels through dual ISPs (with 2 couples of Cisco ASA) between same devices

I currently have a simple site-to-site VPN setup, connecting machines from site 1 to site 2 through 1 ISP, using a set of ASA 5506X. All is good. I'd like to "double" that setup for ...
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2answers
58 views

Why are ISPs arranged in hierarchies?

ISPs are organised in a hierarchy where the Tier 3 ISPs are connected to Tier 2, and Tier 2 ISPs are connected to Tier 1 ISPs. Why are they organised in a hierarchy? Is it because if all devices were ...
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1answer
26 views

Why does GRE tunnel has lesser TxBS/RxBS than its physical interface?

Given for instance, interface Tunnel200 tunnel destination 110.153.1.1 There's a static route for 110.153.1.1, pointing to physical interface Gi0/0. Gi0/0 is only used for tunnel200. Under show ...
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1answer
64 views

How do I apply an access list on a switch?

I'm configuring a very small network on packet tracer 8.0 and I have a single 2960-24TT switch which is connected to 2 PCs and 1 router. Everything is on the 24.17.2.0/24 network and I added a VLAN. I ...
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1answer
43 views

How to connect to different VLANs through VPN

I have the following setup: I have setup a Layer 3 Switch with multiple VLANs Multiple devices are connected to it on different VLANs via untagged access ports There is also a router connected to the ...
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1answer
22 views

Forward Avahi mDNS packets from one network to another [closed]

I have a Linux device connected to two different networks. eth0 is connected to 198.18.248.x and wlan0 is connected to 198.19.255.x. Another device connected to the 198.18.248.x network and it's ...
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1answer
40 views

How routers route packets to a specific network

As I understand it, routers route packets to a specific network based on network id and of course the network id must be unique on the Internet, now the question is: maybe there are billions of ...
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Masking all IP Addresses in a subnet to appear as one IP Address on the main network Using Siemens S615

I am trying to create a network setup that would take many devices that are working together and have them appear as one device or IP on a network using a Siemens Scalance S615. The setup would be as ...
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3answers
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Why do IP(v6) routes require a next hop IP(v6) address and not just a MAC Address?

My understanding of how you "ask" a router to route a packet for you is that you simply put the IP(v6) address of the destination host and the MAC address of the router you are routing via ...
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1answer
58 views

Design question: VLANS or Routed interfaces over dark fiber between sites seperated by 10s of km

Production network design idea: 7 sites total. Each site has an HP Procurve core switch. Each switch has at least 2-10G dark fiber connections to other sites. A few links are under 40km, the remaining ...
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3answers
76 views

How are MPLS routers connected to each other?

So MPLS is one of the many ways to connect two or more distant sites. In other words, it is some kind of a "WAN solution". But what is the "WAN solution" for MPLS? Take for example ...
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3answers
475 views

Multihoming with two 'good' providers - load sharing strategy?

We get two 100G links, one from each provider and our aggregate traffic is sub 100G. The rationale is one provider can fail and the other will pick up the slack with zero degradation. Our traffic ...
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2answers
40 views

How to configure static routing when there are two routers between the source and destination network?

How can i perform static routing from router A to reach 192.168.1.0/30 network in the below diagram(please don't ask why do i need two routers between them). All the example of static routing i have ...
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Can I route DHCPv6 & Router-Advertisements through another router? [closed]

I have asked this question on Super-User, though I'm not sure, it's the best place. 1 I believe this Exchange is a more appropriate place to ask: I have a dual router setup (two routers behind each ...
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1answer
47 views

How is the subnet mask detected over the internet with CIDR (classless inter domain routing)?

Lets say there are two public IP addresses. One is 21.120.12.8/16 and the other is 21.120.12.8/8, they are different network IDs but when used over the internet how are they both differentiated? Or is ...
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9 views

Extract Palo Alto ACC stats in text format

I have a Palo Alto p220 firewall, which acts as a virtual router at the same time. I would like to get the traffic data (download/upload in bytes per IP) in a format, which I could then parse on my ...
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1answer
19 views

N routers but only one valid dynamic gateway

I'm not able to figure out a good strategy for this situation. There's one router per client and all the routers are in the same network. Each router is able to connect to an external router in a ...
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1answer
20 views

Unable to Communicate from server to other servers after migrating from existing firewall to new firewall

In our existing environment we had migrated old firewall with new firewall after this activity . we had faced connectivity issue . From servers unable to reach other servers . Post clearing ARP table ...
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1answer
33 views

For UDP traffic reverse route is required or not

when compared to TCP protocol, UDP is non reliable protocol no knowledgement packet is required for previous packet before sending new packet . so in this case reverse route configuration is required ...
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1answer
39 views

What might be the potential impact on increasing or decreasing MTU size of packet in network

i am looking eagerly to know the potential impact on network while and after changing maximum transmissions (MTU ) from 1500 default value to any other value .
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32 views

Router on one side of a GRE tunnel not adding OSPF route through the tunnel whilst the router on the other side is

I have configured GRE tunnel between the Dublin and Carlow routers with the following commands: //Carlow int tunnel 0 ip address 172.16.12.1 255.255.255.252 tunnel source s0/0/0 tunnel destination 87....
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3answers
44 views

Can I use the default routing rule “ip route 0.0.0.0 0.0.0.0 f0/0 192.168.xxx.xxx” to specify 192.168.xxx.xxx as my proxy server?

I'm new to networking and I just learned Cisco router's static routing. I know that ip route 0.0.0.0 0.0.0.0 f0/0 192.168.xxx.xxx states that all packets should be forwarded to 192.168.xxx.xxx. Can I ...
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3answers
83 views

Can a router process two packets simultaneously?

I am new to computer networking and am reading Chapter 1 of Computer Networking (by James F. Kurose and Keith W.Ross). They have mentioned that the nodal delay is a sum of queuing, transmission, ...
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1answer
23 views

client has 2X1910 switches 1x1920 switch traffic not passing correctly some nodes are responding to pings and others are not [closed]

New to vlans, bridging across multiple L3 switches and not sure where to start so here goes in hopes of learning Layout is this 1910-24g-POE (Switch01)>>>>>>>>>>>>&...
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2answers
55 views

Transfer subnet needed between Firewall and Routing Switch?

When looking at the image, the Switch is routing capable (L3) and is the default gateway for clients in the LAN. We plan to introduce a new Firewall and stand before the question if we should give its ...
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9 views

Is there any way to send different data packets together over wireline/wireless link? [duplicate]

I would like to know if there is a technology that allow to send many packets (of different data) together and at the same time over communication link (whether in wireline or wireless networks) of ...
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2answers
43 views

BGP Cisco best practices to filter client asn and prefixes

I have two bgp routers. OSPF as IGP and on Loopback's iBGP. Both routers have different peers, but both receive full routing table. I have to connect client through BGP and give him full table. Client ...
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1answer
29 views

BGP Cisco internal and external distance

I have two bgp routers. OSPF as IGP and on Loopback's iBGP. Both routers have different peers, but both receive full routing table. In google I found on many presantations "bgp best practisec&...
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1answer
50 views

Can't send message from RIP to static through BGP

Before deep into the question, please see this topology and the results of sending messages from one router to the other router: I have succeeded in sending a message from R0 to R2 (or vice versa), ...
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1answer
20 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 ...
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6answers
905 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 ...
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0answers
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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 ...
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1answer
16 views

Ping6 replies go to a different interface [closed]

Server A has two interfaces (i1 and i2) with the same IP on them, say fd11:1111:1111:1111::1/48. Server B has the same two interfaces with the same IP on them, say fd11:1111:1111:1111::2/48. When ...
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1answer
63 views

ebgp in one broadcast network

can you help me? Why vios4 dont change next-hop(ebgp) when it send 3.3.3.3/32 to vios5? On vios5 i see network 3.3.3.3 with next-hop 192.168.1.3
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1answer
23 views

EIGRP : Feasibility Condition not satisfied

What happen if the Feasibility Condition not satisfied and we can not pick a feasible successor?

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