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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.

0
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3answers
40 views

How is traffic forwarded though IXPs if route servers do not forward any traffic

while i was studying about IXP route-servers, i read that they do not forward any traffic. I get that a route server is a "control plane" entity and it is used for easier bgp peering. However, i ...
0
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0answers
10 views

How can I communicate between two networks? [on hold]

I have a primary network that is connected directly to my modem. Primary gateway: 192.168.0.1 From my primary router, I have another router connected. It has an ip of 192.168.0.100 on the primary ...
0
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0answers
25 views

Understanding Source and Destination in GRE encapsulated packet

I have a dump of ICMP packet. My goal is to figure out maximum information as possible from it. Here is WireShark summary on it: No. Time Source Destination ...
4
votes
1answer
294 views

Will the data transfer with the destination on the same LAN network be routed through the internet when the WAN IP is used?

I'm planning to set up a Nextcloud locally. I will be using my own domain with a DNS record to connect to my WAN IP and port forward the needed ports to the local machine running Nextcloud. Now of ...
0
votes
1answer
20 views

IGP vs LDP forwarding

By default when MPLS and LDP is configured in a cisco IOS/IOSXR and some IGP. If I forward a packet toward internal IP. Router will use MPLS to get destination. When show the routing table I only can ...
0
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0answers
21 views

Is it practical to attack routers to change the route as we prefer? [on hold]

In the Internet communication, the routers have crucial role for routing process. Is it possible to attack routers to change the route as we prefer? And if yes, how practical is it? And has such an ...
0
votes
1answer
49 views

A new version of RIPv2 using different keys for each router

There's a problem in a textbook that is really stumping me. How would you enhance the RIPv2 protocol to provide a (more) secure and scalable schema for distributing the updates? Describe the ...
2
votes
1answer
45 views

Setting local preference in BGP

I am trying to set the local preference for this configuration To make a route from R1 to R4 via R3. That's how i configure R3 R3#conf term Enter configuration commands, one per line. End with ...
0
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0answers
8 views

Determine efficiency of this protocol [closed]

My solution: I have no idea if what I did is correct. I'm getting a bit confused differentiating between 500 frames/minute and the 4.8Gb/s, they both seem like transmission rates to me. I'm assuming ...
2
votes
1answer
33 views

WISP Network Edge Device - Router vs Switch

I am faced with an issue right now working for a small rural WISP. We have roughly 250 wireless customers throughout our area using Ubiquiti radios. Our main fiber drop comes in from a larger ISP on ...
0
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0answers
20 views

Pfsense firewall in front of router denies return packets on WAN interface

So I am trying to articulate this as accurate as possible and while I have a solution I think there is probably a better one. This is my network LAN ---> Router-LAN / Router-WAN ---> ...
0
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0answers
6 views

UDP packets dropped for WCCP on different Interface

ASA 5512-x Version 9.9(2)25 I am trying to configure a WCCPv2 forward from my inside interface 0/1 to the WSA (websense appliance) on interface 0/4. I have set up what i think is correct for WCCP:...
0
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0answers
14 views

How vulnerable is RIP v2 to attacks? [duplicate]

In RIP v1, usually there is no check on the received information. Thus, an attacker can forge the packets and impersonate anyone else in the network. The attacker can freely introduce new routes and ...
0
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0answers
32 views

Redirect all internal web traffic through internal Proxy

I am tasked with redirecting all internal http/https traffic out of an internal Proxy server first before it hits the internet. My current setup would be 3750 stack switches to a router then to a ...
0
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0answers
33 views

Classical Internet routing vs. Swarm routing? [closed]

Is it possible to mention the drawbacks/advantages of Swarm routing (such as Ant routing etc) in comparison with classical routing algorithms in communication networks in a general view? In other ...
4
votes
1answer
120 views

Juniper SRX 240 - Routing subsystem not running on secondary node

Does anyone know why rpd would not run on secondary node? Thanks
0
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1answer
30 views

Download Internet Routing Table

What is the best way to download a snapshot of the Internet's IPv4 routing table? I need check if IP addresses are routable. It needs to function offline, so a looking glass server won't work. I know ...
1
vote
1answer
55 views

Networking Questions (Routing and Switching)

I inherited a haphazard network that I'm in the process of cleaning up and modernizing. Here is a synopsis of the current issue: We have a MySQL DB hosted on a Windows 7 PC (solely used to host the ...
1
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0answers
55 views

OSPF over IPIP tunnel doesn't work for CSR 1000v in AWS

I literally have the following topology shown in the figure below. I have 4 VPCs, each VPC has 3 subnets (1 for the VM instance and the other 2 for interfaces). Each VPC hosts a Cisco CSR 1000v in ...
0
votes
1answer
35 views

Bad mask for loopback interface

I am trying to implement BGP session. I was given this table. When I try to configure loopbacks the first loopback works in the proper way R1(config)#interface loopback 0 R1(config-if)#ip *Mar 1 ...
1
vote
2answers
76 views

Users on one VLAN cannot access multicast resources [on hold]

Feel like I'm getting closer to fixing my issue... This is the simplified version of the multicast... -No RPF Failure -pim sparse mode on all interfaces -multicast routing enabled I forced a group ...
2
votes
2answers
65 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 -...
0
votes
1answer
33 views

How to create interfaces for CSR 1000v for GRE tunnels?

Well, my idea is to connect to 4 CSR 1000v routers in different VPC (without VPC peering). I've basically finished with everything with the pre-configuration creating VPCs, subnets IGW, modifying ...
1
vote
2answers
27 views

My ip address changes daily. How can I setup port filtering so that I can access my VM via RDP without adding the new ip everyday?

So I have a VM in Azure. I would like to ensure that only I can access it. I setup port filtering so that only my IP is accepted, and only from port 3389. The next day my IP changed, but only the ...
3
votes
1answer
29 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 ...
3
votes
3answers
44 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 ...
1
vote
0answers
26 views

Fragment Table Overflow router cisco (strange Behavior)

I am getting this error message many times in my Router Cisco : %IP_VFR-4-FRAG_TABLE_OVERFLOW: Tunnel1: the fragment table has reached its maximum threshold 16 %IP_VFR-4-FRAG_TABLE_OVERFLOW: Tunnel1:...
1
vote
1answer
48 views

VLAN forwarding in cisco

We have a Cisco 3750X (L3) as a core switch and 10 Cisco SG-300 (L2), each Switch is in a separate VLAN (include core switch) now I want to define VLAN forwarding rule on my core switch, so all ...
3
votes
1answer
141 views

PAT not translating at all

I am studying for my CCENT. I threw together a PAT practice lab. Other than DHCP and RIP everything is pretty stock. No VLANs No security Just NAT overload on ACCESS router. I am stumped why it isn'...
2
votes
1answer
36 views

My OSPF Multi Area Topology is not reliable

I made an ospf multi area topology, but it's inconsistent. At times, host from the A area could ping to hosts in other areas however, sometimes otherwise (failed to arrive). Whenever I tried to do a ...
1
vote
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 [...
1
vote
1answer
29 views

Multiple Networks on Sonicwall with no access to cisco firewall

The issue im having is that i have 2 networks with 2 internet connections. We now all of a sudden have a POS system handling our network. This system blocks our email and a bunch of pages we use. They ...
2
votes
1answer
52 views

Spine Leaf L3 TOR DMZ Design for Virtual Environments

I have a question regarding DMZ design in our DC. Let me give you some background. We have 1 rack 2 Spines 2 leafs L3 TOR connected to each spine ESXI hosts connected to the leafs 1 Palo ALto ...
1
vote
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 ...
1
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0answers
36 views

Simulating TCP/IP Illustrated Test Network [closed]

I just recently bought TCP/IP Illustrated volume 1 first edition for cheap and I see that they reference a test network throughout the book that looks like the following Now I'm not the sharpest tool ...
3
votes
1answer
131 views

What is wrong with this set of routers?

What is wrong with this network, why am I unable to connect to the internet from the network 172.16.1.0 here? I've done all the routing setup using GUI (that should not cause the problem, though). ...
1
vote
1answer
39 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 ...
1
vote
0answers
20 views

Are all Ant routing algorithms the same?

I am not really sure if this question is related to the Network SE or Artificial Intelligence SE. So, I asked it in both sites. Are all Ant routing algorithms the same? And if No, what is the common ...
1
vote
2answers
38 views

ASA5520 to 2960X setup

I am setting up a new remote office setup with an ASA5520 to a Cisco 2960X switch. I subinterfaced the the ASA inside to allow the Wired and Wireless subnets. On the 2960 I created a Vlan 100 for the ...
4
votes
1answer
44 views

juniper advertising smaller subnets with a bigger static route in BGP

I have a /18 in RIB but I would like advertise smaller subnet in BGPfor specific reason to diff ISP etc. Is there a way to do it without creating a null route or static route. Is some way in policy ...
1
vote
1answer
53 views

Firewall on a stick for Intranet and static routing

I have a question about possible problems that can occur with this network design. If I have an intranet with a firewall on a stick design, multiple switches with layer 2+, is this setup fine? or ...
3
votes
1answer
62 views

How to connect 192.168.1.x network to 192.168.100.x gateway?

Hello fellow networkers. I am very new to this world and don't know a great deal about IP addresses and subnetting. I however stumbled upon quite a big problem (for me at least - haha) My entire ...
4
votes
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 ...
1
vote
0answers
24 views

Dedicated Internet Router or VRF on L3? [closed]

I need to route public networks on our equipment. I plan to use existing 4500X and create a new vrf PUBLIC. There are already other vrf's existing handling internal traffic. [ISP RTR]+---/30-Network-...
2
votes
0answers
55 views

OSPF behavior for redistribute routes

I have 2 equal cost path links between PeerA and PeerB and all its interfaces are participating in the same OSPF area. When i redistribute a static route (172.16.2.0/24) from PeerB to A, does the ...
4
votes
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. ...
0
votes
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 ...
1
vote
1answer
250 views

Are Protocols written in programming languages?

The protocols such as HTTP, IP, BGP are written in programming languages or simply plain English text ? If it is written in plain English, then how it is communicated with web browser, switches/...
1
vote
1answer
62 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
votes
1answer
81 views

Cross datacenter IP failover/migration

I am trying to wrap my head around this (very) simple issue of IP failover from one physical location to another. I have a few Virtual machines running at Site A where I need to rebuild the NAS. In ...