Questions tagged [tunnel]

For questions about network tunnels.

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UDP encapsulation inside TCP [closed]

Following scenario is from a private project. Let there be two clients : A and B. Let the server be S. A sends data to S and S relays the data to B. How this happens is as follows: S is listening on ...
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2answers
42 views

What are the benefits of using a transport label in L3VPN?

If not utilizing any form of TE (Traffic Engineering), are there any benefits of using a transport label in L3VPN - instead of just using a simple IPinIP tunnel? e.g. if traffic is egressing PE1 with ...
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1answer
28 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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21 views

How to configure ZPF with Tunnel?

I am trying to configure ZPF in a Cisco 4331 router in Packet Tracer. I have a tunnel interface for GRE tunnel in this router. But I am not being able to assign this tunnel interface to any zone due ...
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1answer
213 views

MTU/MSS Oddness?

We have an IKEv2 IPSec tunnel between two Sophos XG Firewall appliances in a corporate system for a remote site. We don't have any specialized MSS or MTU settings other than what the IPSec tunnel ...
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1answer
18 views

What is a child tunnel? [closed]

I only heard this term today, but it was explained to me as a point-to-point VPN (so, two routers with a VPN tunnel established between them) and a firewall configured to only allow certain hosts to ...
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0answers
15 views

Segment Routing Encapsulation on Client Interface? [closed]

I wanted to test SRv6. Always between two clients (client 1 <-> client 2). If I do the encapsulation on the client everything works smooth as expected. Client 1 (encap SRv6 Tunnel) <- 2001::/...
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1answer
102 views

routing MTU size and encapsulation?

I did some research for my question beforehand such as this one:Cisco routers THROUGHPUT - MTU and packet size however, it seemed not precise to explain the doubts in my head. My primary goal is to ...
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3answers
87 views

Combining NAT an tunneling

I was reading a text and a doubt came to mind. Suppose there is an interface in a router that implements NAT. That same interface is the extreme of a tunnel. If I was to send a message through said ...
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2answers
46 views

How to build secure access for cloud machine in small startup [closed]

We have 7 member team (3 dev + 2 qa + 2 Sales). We host our PROD + QA + DEMO server in GCP. As of now, all our PROD/QA/DEMO/DEV/QA-DB/DEV-DB machine are having public IP, so that we can ssh into them. ...
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1answer
471 views

What's the difference between L2TP and L2TPv3? [closed]

Is L2TPv3 an improvement of L2TP or a completely different technology? Other than "it scales better" and "the non-proprietary MPLS" I can't find much information about it that's ...
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15 views

Is it possible to gain VPN access through RDP [closed]

Scenario: I have been tasked to resolve an issue for a client's EmailReceiver program. I have the source code on my PC. I have been given RDP Access to a entry point machine, through which I can ...
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2answers
1k views

Encapsulation: can a higher protocol encapsulate a lower protocol?

I've heard someone say that a protocol higher up the osi model can encapsulate a lower protocol. As far as I know, personally, a protocol can only encapsulate a same-level protocol or one at a ...
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328 views

Q-IN-Q Tunnel between cisco and mikrotik not work

i have try to make A Q-IN-Q tennel between two router (cisco and Microik) through cisco switch in mikrotik VLAN ID = 10 IN interface ether1 VLAN ID = 20 in interaface Vlan10 ip address in interface ...
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2answers
56 views

What does a VPN Tunnel offers other than encryption?

A VPN tunnel is end to end encrypted. But does it gurantee to provide features other than encryption, such as low latency, low jitter etc?
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1answer
105 views

Confusion about IANA “Protocol Numbers” registery

In the IANA registery for "Protocol Numbers", there listed 2 IP protocol versions: IPv4 at #4 and IPv6 at #41. Their "protocol" column says IPv[46] Encapsulation, and "reference" column points to 2 ...
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1answer
106 views

PPTP encapsulation process

i am learning networking and vpn technologies now and i have some problems with understanding the whole PPTP encapsulation process. So i will write steps of PPTP encapsulation process (as i understand ...
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1answer
58 views

GRE Encapsulation

i am learning networks and tunneling and i have problems with understanding some things about GRE. The structure of tunneling below: [Transport Protocol][ensapsulationg protocol(GRE)][encapsulateed ...
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1answer
70 views

Finding MSS for a remote connection that uses tunnelling

I'm working on a codebase where we're trying to test network health by verifying if we can ping the remote site having payload = MSS without any packet fragmentation (using -df flag). Typically, for ...
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1answer
20 views

IP-Sec VPN Tunnel Established Between 2 Remote Machines. Why Can't Machines In Their Subnets Connect Across? [closed]

Have 2 Remote Ubuntu Machines in different subnets. one: 192.168.1.0/24 Two: 192.168.2.0/24 Established VPN tunnel between 2 machines, 1 in each subnet. Their IPs: Public IPs 1.1.1.1 2.2.2.2 ...
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1answer
645 views

Cisco qos, service-policy on output interface on 1100 ISR seems ignored

I am trying to configure QoS for a specialty purpose application, and it is the first time I have done QoS. This is on an 1100 ISR with IOS XE 16.09.03. The device is a set of 4 that establish a mesh ...
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1answer
46 views

VPN to a current subnet ID

I am sure this is a fairly basic question, but the standard google searches have not told me what I am looking for. I have a restaurant that uses an ipad point of sale on a dedicated subnet id: 192....
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1answer
162 views

Tacacs+ over VPN is not working

R3 is a Tacacs+ client and Server0 is configured as AAA server with Tacacs+ but R3 is not able to authenticate. R3 Configuration: ! version 15.4 no service timestamps log datetime msec no service ...
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1answer
317 views

What is the difference between VPN and Domain fronting?

What is Domain fronting? and how it is different from a VPN?
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1answer
272 views

How can I accomplish VPN across Dual Wan connections?

How can I accomplish VPN across Dual Wan connections in a optimal way? Idea is to make: Site to site VPN. Make single connection inside the VPN to use full bandwidth of both wan connections using (...
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1answer
797 views

How do you define interesting traffic using an IPSec Profile on a Cisco router?

I apologize if this is a duplicate, but I'm having difficulty figuring out how to define interesting traffic on a Cisco router using an IPSec Profile referenced by a tunnel interface. The old-school ...
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1answer
78 views

Assign a new public and static IP to a router behind my main router [closed]

What can you suggest to bring a second public and static IPv4 so I can configure my WAN-A interfase with my primary and an additional secondary IP settings so I can route all the traffic from the ...
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1answer
992 views

Dropping packets between router and firewall without firewall rule

I have a user that is trying to access his company network resources on his home network. He is able to access SMB shares and other resources, but he is unable to access their AS400 on any computer in ...
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2answers
9k views

VPNs are working in which layer of the OSI model? [closed]

As the following picture shows, it is possible to categorize VPNs in two general categories: Client-based VPNs Network-based VPNs When it is required to choose a VPN for implementation in a network, ...
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1answer
166 views

Remote access to the network without port forwarding (blocked by ISP) - VPN [closed]

I need to setup a following configuration: A router Mikrotik is connected to the internal Network1. The router has a USB 3G modem that is connected to it and enables internet access from the ...
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1answer
656 views

qos inside vpn, possible or not ? I read yes and no

I am wondering if possible to do QOS (or similar action) inside vpn tunnel to a cloud server. the goal is to reserved bandwith for voip traffic. I read that you can with GRE and other people said, ...
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3answers
327 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 ...
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1answer
506 views

Traffic not send in IPsec with a Cisco ASA

I try to set up a site to site IPsec between an Ericsson router and a Cisco ASA, as shown below: My tunnel is UP and R1 seems to be working fine. However, my ASA does not forward traffic between ...
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2answers
715 views

What are the differences between tunneling and regular encapsulation?

What are the difference between tunneling (https://en.wikipedia.org/wiki/Tunneling_protocol) and regular encapsulation (e.g. TCP/UDP over IP, HTTP/SSH over TCP)? Is TCP/UDP over IP considered ...
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2answers
2k views

Difference between WAN and VPN(tunnels)

I got my CCENT and working on ICND2 to get my CCNA. I am stuck on this topic and am unable to grasp the context. WAN and VPN and how they differentiate. My understanding is we need WAN for "Physical" ...
2
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1answer
126 views

VyOS: Failure to commit after L2TPv3 configuration

I am trying to get familiar with VyOS (using a VM) and while working on L2TPv3 I encountered something strange: after configuring the L2TPv3 interface and try to commit, an error occurs as if the ...
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2answers
155 views

Security implications of IPv6 tunneling over IPv4

I've read that IPv6 over IPv4 tunnels are a security risk because IPv6 traffic cannot be intercepted by Intrusion Detection Systems and Firewalls. This apparently deterred some networks to deploy IPv6....
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50 views

IPSec Tunnel is up but no Communication with End Systems?

I need help for IPSec tunnel. Currently, I am working on a small task to create remote access between my laptop and office router, in order to access the office LAN network. IPSec tunnel is working ...
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1answer
108 views

IPSec tunnel between 2 LANs using HSRP in each side

This is my first post here, so tell me if there's something I'm doing wrong. I'm currently working with another IT student on our end of degree project and we're building our network in PT. Our ...
4
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1answer
577 views

How IPsec tunnel mode work without GRE

IPsec tunnel mode encrypt a whole IP packet and sends it as the payload of another IP packet. I have always used GRE as the encapsulation layer when doing IPsec encryption. However, how could I have ...
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0answers
385 views

Why do the tunnel protocol on these two router show different values

Two routers R1 and R2 have a tunnel built between them in the 103.103.103.0/24 network. The end point of the tunnel are 75.75.75.2(on R1) and 76.76.76.2(on R2). Can anyone explain why does the Tunnel ...
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1answer
25 views

Does “tunnel” here mean the same as tunnelling as in SSH?

From book Data and Computer Communication Tunnel Unlike the proxy and the gateway, the tunnel performs no operations on HTTP requests and responses. Instead, a tunnel is simply a relay point ...
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2answers
204 views

Wireguard protocol understanding source of the received packet

From the docs, WireGuard associates tunnel IP addresses with public keys and remote endpoints. When the interface sends a packet to a peer, it does the following: This packet is meant for ...
2
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1answer
122 views

Wireguard protocol understanding where the packet got sent

From the docs, WireGuard associates tunnel IP addresses with public keys and remote endpoints. When the interface sends a packet to a peer, it does the following: This packet is meant for ...
4
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1answer
497 views

Scaling VXLAN tunnels in openvswitch

As we're creating a cluster of tens of KVM host nodes we've chosen openvswitch as our virtual network infrastructure. So we need to make isolated virtual networks between VMs on demand. I've seen ...
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0answers
336 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 ...
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1answer
35 views

Is it possible to implement virtual network based on MAC in IP instead of MAC in UDP?

We know that flannel use MAC in UDP to create a overlay network. My question is: UDP header only provides an extra port number fields, let's suppose that one physical machine only run one flanneld ...
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1answer
590 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 ...
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1answer
46 views

Network Security Tunnel

In the Tunnel Interface, when I edit the tunnel information, it shows: Attributes Values Tunnel Source IF10 Tunnel Destination 1.0.0.1 Tunnel Mode GRE What does IF10 ...
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0answers
173 views

IPSec Tunnel not coming up: Issue with ACL?

I'm trying to bring up a IPsec tunnel between router and a bridge. I can see the Ipsec tunnel configurations are up and running but I think I have made a mistake in the ACL and hence the encr and decr ...