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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91 views

Cisco BDI not Forwarding L2 Traffic?

I'm new to interface bridging, and I have an ISR4431 running 03.16.04b.S on which I need to bridge between two interfaces for two hosts: One interface is connecting directly to a host, the other to a ...
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3answers
169 views

Testing Secondary Static Route

I am in the middle of migrating to a new IP scheme. From 192.168.10.x/23 to 10.6.x.x/19. Our ISP handles layer 3 and we statically route from our L2/L3 Cisco 3750G switch stack to their L3 device. ...
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58 views

How to redistribute BGP routes learned from AWS in one VR into another BGP running in another VR in Palo Alto firewall?

I have about 1000+ prefixes I am learning from AWS on Palo Alto through a BGP. This is on the secondary VR. Main VR is where my core routing is situated along with another BGP instance pointing to ...
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2answers
34 views

Ping responses to the Gateway

Last week, I have experienced a strange scenario with Adtran NV3448(a router) and an ISP circuit. Adtran is a similar company like Cisco, also makes networking equipment such as Router, switches, etc. ...
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1answer
50 views

Access IPSec site from another IPSec site

Our company delivers, installs and maintains custom build hardware at customer sites. In all cases the delivered setup contains at least 1 server and 2 network devices. To keep the control over the ...
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1answer
36 views

Make eBGP and iBGP equal in Juniper MX204

Apologize for the dumb question, I come from the server world. Our network admin is on holiday and I'm filling in. For the sake of simplicity, we have a fairly symmetric traffic pattern, what goes up ...
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3answers
361 views

Routing between completely separate private networks

I’ve got a request from a partner vendor in a completely separate routing domain to directly route a /24 rfc1918 network on my rfc1918 internal network. The proposed solution has their handoff ...
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15 views

OSPF Router ID election query [duplicate]

I have a query regarding ospf router id election. Suppose I have a router with 3 connected interfaces. 10.1.1.0/24 11.1.1.0/24 12.1.1.0/24 I have enabled ospf area 0 on network 10.1.1.0 and 11.1.1....
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1answer
20 views

answer packages rejected between mangle/prerouting and nat/prerouting

I am currently configuring a ubiquity edgerouter for our network. We have one uplink port (eth2) and two internal ports (eth0; with vlan 1) and eth3 (with vlans 2,3 and 4). uplink and vlan 1 have ...
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1answer
52 views

Routing failed after define static route on core switch

Current connection path: 10.40.20.0/24 desktop <-> access switch <-> core switch <-> 10.30.15.33 NAT firewall for internet access Objective: adding additional path as following to ...
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1answer
76 views

Simple VyOs Static Routing on GNS3

Sorry for the beginner question. I'm trying to simply set up static routing on this GNS3 topology. Specifically, I want Sam to be able to ping Jack. I've assigned all of the VPCS machines ip's, and ...
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2answers
105 views

How does a router decide what route to forward a packet when routes come from different routing protocols?

I'm a little confused. I know how the best route makes it to the routing table, but what process does the router follow to choose a path to forward a packet if, for example, you have something like ...
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1answer
29 views

Heading off to college - need help engineering a way around campus ethernet restrictions [closed]

This is all a bit outside my area of expertise, and to be honest, i'm not even sure its possible. My roomate and I both have raspberry pis scraping data in fixed intervals that need to operate over ...
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2answers
144 views

How are different phone/GSM operators connected with each other?

This might be a noob question, but I am having trouble finding an answer to it. Let’s say I am a new GSM operator. How would I go about connecting my network and my subscribers to the rest of the ...
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30 views

Cisco: NAT overload does not work on Serial point to point interface /32 address on Cellular modem

I have a LTE modem installed in a Cisco 1921 that is able to connect to the carrier network and ping out sucessfully from the router, however NAT hosts are not able to connect to the internet. There ...
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1answer
352 views

Destination NAT on Cisco ISR

I know how to perform regular overload PAT in my lab running sh ver Cisco IOS XE Software, Version 16.03.09 Cisco IOS Software [Denali], ISR Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 16.3.9, ...
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0answers
86 views

Cisco ASA 5506: Adding two public IP's that are on the same subnet for the primary and backup interface

Im programming a Cisco ASA 5506. I need to add a primary (public) IP that is x.x.x.82/24 and a backup IP that is x.x.x.81/24. The ASA wont allow me to do this as it gives me an error: "the IP ...
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2answers
119 views

Working in packet tracer, can I configure two routing protocols

I am working on network lab designing topology. I am able to configured two routing protocols which surprised me. I configured RIP and OSPF routing protocols in layer3 switch and advertised same ...
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30 views

Issue with PIM-SSM Multicast Configuration ISR4431s

I have an issue with my PIM-SSM multicast configuration using ISR4431s.    I am wanting to forward broadcast data from an application from one VLAN in on the multicast source to another VLAN on a ...
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0answers
14 views

How does IP fragments assembled when identification number field is too small?

Please take reference from this question. It is said in RFC 6864 that if IP V4 IDs remain unique during MDL, it would limit speed to max 6.4Mbps. Now high speed devices generate data at a much higher ...
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2answers
55 views

How do I enable communication between hosts on two Intranets with different routing protocols

Having completed the Networking Essentials Course from Cisco Networking Academy, I've been practicing on Packet Tracer until I came across this scenario. Supposing we have two intranets, A and B. ...
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28 views

why SLA Track 8 isn't applicable to my ISR Router

On a Cisco ISR 4451 I configure SLA Function as follow: track 8 ip sla 1 reachability ip sla 1 icmp-echo 10.1.1.81 source-ip 10.1.1.80 ip sla schedule 1 life forever start-time now And then I want ...
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1answer
145 views

OSPF route advertising same subnet in same area 0?

Now: SW02 currently running OSPF area 0 with redistribute connected subnets which includes VLAN10 with another router/switches which isn't in the picture and not in the scope of this question; VLAN10 ...
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1answer
158 views

NX-OS 9.3: ECMP polarization and “ip load-sharing … rotate”

This is a "why and how exactly does this work" question. The given problem is already solved. QUESTION: I'm interested to understand what "rotate" in ip load-sharing address source-...
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1answer
63 views

What's the point of aggregate routes when the default preference is reject?

studying for my JNCIS-SP and finally digging into the minutiae. I'm trying to grasp the default behavior of aggregate/summary routes. Why are these a reject? Maybe I'm just using them wrong, but here'...
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1answer
99 views

Some mobile clients are unable to connect to UniFi AP mysteriously

We have two UniFi Controllers, one contains the main internet its directly connected to the fibre and then we give internet to the second controller using LAN connection, internet works fine in main ...
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1answer
28 views

routing a network with 2 interfaces and vpns [closed]

I'm pretty inexperienced in network but here is the idea of what i want to do: I have 2 interfaces: Interface #1 = fast internet Interface #2 = stable internet with static ip address this is the ...
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0answers
23 views

Real world IP routing on the Internet [duplicate]

I used to think the Internet looks like a tree, with some extra edges for redundancy. And that the subnets are getting shorter and shorter as you go up towards the backbones, the roots of the "...
2
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1answer
77 views

BFD issue with BGP support on Cisco 9396PX

I have following BGP configuration and trying to reduce my convergence time with help of BFD but having hard time. router bgp 1111 log-neighbor-changes address-family ipv4 unicast network 22....
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2answers
90 views

EIGRP advertising of routes for other networks behind us

Continuing my expedition in to trying to learn EIGRP and other routing techniques in GNS3, I now have another theoretical network, depicted below: Everything in the red area is a mystery. We do not ...
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2answers
30 views

What is the need for the NEXT HOP coloumn in the routing table when we already mention the OUTGOING INTERFACE in another coloumn?

If the OUTGOING INTERFACE is already mentioned in the routing table, it is natural that the next hop will necessarily be the router attached to the outgoing interface. Then why is there a separate ...
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1answer
44 views

Routing between two sites using FTTC Broadband and E-Band Wireless

I have two sites, both with 80/20 FTTC broadband connections that terminate at the standard white box BT modem. The connections both have fixed IP. I’d like to connect these up to each other and form ...
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1answer
59 views

How can i make every network on this topology speak together?

i'm working on this topology for so long and i didn't manage to make every network speak together with different VLAN on each network. On this topology: When i trace a packet sent from PC3 to PC4, ...
1
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1answer
173 views

%Cannot create sub-interface

I'm trying to connect 4 networks with 1 router, i created 2 sub-interfaces in the router, when i tried to create the 3rd sub-interface i got this output "%Cannot create sub-interface", this ...
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1answer
82 views

Trunking multiple VLANs into a single trunk port on a 3650 Switch

Morning: I'm new to the world of Cisco Packet tracer, and I am creating a network for a uni project. So far, what I have is: 5 VLANs (subnetted to 192.168.2.0/26, 192.168.3.0/36 etc) All are ...
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2answers
97 views

Router and switches routing protocol configuration

If I connect switches in each building together, which also link a router, does a routing protocols need to be configured on the switches and the router, or just the router?
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3answers
63 views

Site-to-site IPSec tunnel over Load balancer

I'm having a following topology Could this be archived? I've configured this network, but routing between the two VLAN-s are not working. Using Ubiquity Edge X routers. Could this be archived with ...
1
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2answers
203 views

EVPN/VxLAN border-leaf question

I have couple of question in above design where i have typical clos network design and my leafs are configured for Cisco vPC for redendency and anycast gateway and running OSPF for underlay and BGP ...
1
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1answer
48 views

What are the differences between injecting the default route to IGP using a static route or using a generated route?

Let's say, that I have a following network topology: isp_router[t1-0/0/0.0] <-> [t1-0/0/0.0]ospf_asbr I want to generate a default route for IGP in ospf_asbr router. One option would be a ...
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1answer
29 views

VPN Traffic Routing on Ubiquiti/Vyatta

I'm using Ubiquiti to route certain outgoing ip-ranges through a VPN. I would however like to route all HTTP/HTTPS traffic via the VPN except large downloads. I realize that this is a tall order, but ...
0
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1answer
63 views

Why does the Layer 3 switch drop the ping packet?

I am trying to ping from PC2 (not PC1, there's typo in the picture) to the router's int g0/0, but the packet is dropped at the L3 switch which is along the path. I have tried setting a default static ...
3
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1answer
404 views

Two Datacenter location with same BGP AS number

Currently we have DC-1 running eBGP with my ISP using AS:1111 and i have prefix 1.1.1.0/24 and using BGP Default route because we have only single ISP. Now we are opening new Datacenter in remote ...
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2answers
55 views

Possible typo in Tanenbaum's book about NAPT

From what I have understood from multiple sources (web and other books) about the concept of NAPT (also called NAT overload or IP masquerading in Linux environment), if there is a scenario like the ...
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2answers
76 views

IPV6 static Routing

I'm new to networking and I'm currently learning about IPv6 in static routing. I set up an environment in Cisco Packet Tracer like this: have connected two routers with serial medium , each router ...
1
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1answer
36 views

Caching packets inside the network [closed]

Problem: Let's say I have a network with 10 users or more, all of them want to watch the same video or surf the same web page. Goal I'm looking for a way to cache the incoming packets inside ...
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0answers
44 views

Ping over WAN to LAN (and from server to hosts)

I have a network similar to the one shown at the picture below. The main aim is to get connectivity between antivirus server (10.100.10.9) and hosts placed behind their LAN-gateway (network 10.200.1....
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0answers
24 views

router not learning the default route announced by RIPv2 if the same route exists via a better path

Let's say, that one has a following simple network topology: r1 ◄ ► r3 ▲ ▲ ▼ ▼ r2 ◄ ► r4 All four routers speak RIPv2 on all interfaces. r1 and r2 announce the default route which means ...
1
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1answer
86 views

What happens if the localhost does not interpret 127.0.0.1 as the loopback address?

For the sake of the example, assume gateway to be 10.0.0.1 and host A (my machine) to be 10.0.0.2. If gateway (10.0.0.1) is running a service bound to a port on localhost only, the service should be ...
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2answers
155 views

BGP influence outbound traffic based on prefix

I have two router core1 and core2 connected with ISP router border1 and border2 using eBGP peer and i have 5 public subnect (/24). My ISP sending me default route instead of full BGP table. Question:...
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2answers
131 views

Advertising your prefix out of another ASN

We own a few blocks of IP addresses. At several distinct sites we currently advertise our own prefixes on our routers to our upstream transit provider. We are not anycasting. One /24 is originated ...

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