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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Clarification on when routers encapsulate and decapsulate packets

I'm an application developer working on getting a working knowledge of network engineering, so basically a newbie. I've been trying to figure out exactly when routers decapsulate frames into packets ...
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Hub and spoke IPSec in pfsense

I have 9 different sites and one HQ site where all 9 remote sites connect to via IPSec VPN. All are pfsense firewalls. I want to allow traffic between site 2, 3 and 4. But I do not want to configure ...
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how does routing work with LANs connected on WAN links? [closed]

Confused as to how the addressing is going to work with the routers, I've subnetted the network and everything, now my question is does each router have a network address of 10.1.0.0? and only ...
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12 views

Does UDP hole work if server is on the same subnet? [closed]

I am trying to get a minimal NAT hole punch example working. I think the problem is that the Server and one of the clients are on the same subnet. For that client I only see some local ip from the ...
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2answers
32 views

network slowness troubleshoot

I want some suggestion regarding our network issue: From our office location to our DC ==> it's ~270msc(office and DC lies in different countries). As, you can already see here latency is the major ...
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1answer
30 views

Best Practices with good Home Router and Business Switch. And comparison [closed]

experts I want to make things clear as my networking knowledge is very limited. I have a quad-core home router, TP-Link C4000. And I also have Cisco SG350 layer 3 managed switch, a business class ...
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1answer
35 views

Issue w/ Cisco router and failed NAT and static default route

I have a cisco router that is using a VRF to support a site to site VPN tunnel. I have added a second network to the router for non-VPN standard internet use. My problem is that my default static ...
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12 views

How to route traffic through 2 proxies on localhost with iptables? [closed]

Trying to have the following scenario: (everything is running on the same machine) Client container (172.19.0.2) <-> proxy1 (running on localhost:4000) <-> proxy2 (running on localhost:...
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2answers
65 views

How Does Network Address Translation Work Initially at the End Point Router

I have come across a question that I can not seem to get a quality answer to. I understand how NAT works when a reply packet is received and how it is mapped back to an internal IP address from the ...
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11 views

Pulse Secure - docker network unavailable - workaround? [closed]

I use virtual machine (virtualbox, fedora) with Pulse Secure (VPN) to connect to my corporate network, but I also use docker containers on my VM. Unfortunately, VPN admins decided to block local ...
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Policy based routing: route one IP only trough VPN not working [closed]

I would like to route only one client trough VPN (Wireguard). Edgerouter is in switch mode, eth0 = uplink (192.168.1.239), client = eth4 with manual IP address 192.168.1.188. VPN connection/...
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1answer
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ipv6: I can ping only 1 interface within same network even with static route

This is how I set up a static route. R1(conf): ipv6 route 2004:DB8:2233:23::/64 2001:DB8:1122:12::2 With this, I can ping to 2004:DB8:2233:23::2 (S2/2 on R2) but not to 2004:DB8:2233:23::3 (S2/2 on ...
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32 views

Correctly Setting up DHCP for Intervlan Routing

I am currently building a network and would like my two switches connected to my router to automatically assign ip addresses through DHCP pools to my PC's and devices. I have 4 separate VLans being ...
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2answers
118 views

Can link local addresses be used for transit networks without breaking routability?

I am asking this because my ISP uses SLAAC/DHCPv6 to assign addresses to clients. Firewalls, no matter what brand/name/type get a link local IPv6 address complete with a link local gateway AND clients ...
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1answer
36 views

Find Routes not containing these subnets [closed]

Let's say I have 1000 ranges and I would like to make routes that doesn't match these ranges, anyone has any particular tips or tools to share beside doing math ? Example : I have these ranges 13....
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20 views

How can I use standard communities for route leaking?

I have a network something like this: R1_____Edge1____BB____Edge2_____R2 \____R3 R1: VRF BLUE (10:10) R2: VRF BLUE (10:10) R3: VRF RED (10:20) Edge1 and Edge2 has both ...
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VPN routing issue with PulseSecure [closed]

I have a Windows PC (192.168.10.99) in the local network 192.168.10.0/24. Default gateway in this network (192.168.10.1) has a VPN connection to the remote network 10.8.0.0/16 (RN1) that can be ...
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2answers
36 views

Why doesn't NAT drop packets with spoofed public source IP?

As I read on Section 4.3.8 of this page https://www.manrs.org/isps/guide/antispoofing/, The following code: ip nat inside source list INSIDE pool OUTSIDE overload will translate packets with a ...
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1answer
43 views

Is it possible to determine the origin of a BGP withdraw message?

is it possible for an ASN in the BGP path to determine what ASN has been the originator and the cause of withdraw message?
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10 views

How does switch forwarding recognizes destination MAC address of final hots? [duplicate]

Lets consider TCP/IP stack. If host A want to send a packet to host B in another IP network Host A will send a frame with src MAC its address and destination next hop (router) MAC address The ...
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1answer
18 views

static and default routes on unixoide OS question

I have a question concerning static routes and default gateways. I am trying to rebuild an exercise similiar to an older CCNA question (https://www.omnisecu.com/cisco-certified-network-associate-ccna/...
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What's the difference between “IP NAT Inside Source” and “IP NAT Inside Destination” commands in Cisco routers? [duplicate]

As much as i know both of this commands translate source address of packets that travel from inside to outside and destination address of packets that travel from outside to inside,so what's the ...
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1answer
23 views

Segregated network - managed switch or router?

I have 3 pc connected to a switch that is connected to a bigger network. I want those pc to live in their network and don't expose their ips. (in this very moment the scope is accomplished using a pc ...
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1answer
21 views

Passing network bonding to other port [closed]

I currently developing network for office place using mikrotik cloud core router, the outline is 2 ether interface into 1 bonding interface and distributing into 2 ether interface or maybe 1 ether ...
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19 views

Trying to establish stable connection, ping drops intermittent in PACKET TRACER

This was given by my friend and i cannot touch any of the configuration of the ISP router in the middle. but i have screenshots of routing table and interfaces. pinging the middle router from HOST A ...
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1answer
63 views

What is difference between Branch, WAN, Core, Enterprise Routers?

While studying routing protocols is OSPF, BGP I came across Network topologies distinguishing between Branch, WAN, Core, Enterprise Routers. I am having a hard time understanding their functionality ...
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1answer
25 views

Inducing delay in packet transmission at router level for a particular flow

I want to segregate flows at a router. I can do this by using the destination IP on the header. I also want to make sure that my router does not forward any other packet for the time being I am sure ...
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1answer
63 views

Will the router crash when it is sent routes that it can't design to hold?

I am working with a Juniper router which has the capacity to hold 60M routes in the RIB and 4M routes in the FIB. Should the router crash when more than 4M routes are being sent to FIB, considering no ...
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1answer
28 views

Do DR-Other router forwards Type 2 LSA received by DR?

In the Diagram below when R1 is newly added to Network Topology R1 and R2 become neighbors and exchange Type 1 LSA from R2, R3, R4. But how R1 knows Network LSA created by the DR in LAN(subnet 1). ...
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1answer
44 views

OSPF neighbor not working

I'm currently designing a spine leaf network, 2 Spine switches and 4 leaf switches. btw this in packet tracer. So in order its Spine1# and Spine2#, then Leaf1#, Leaf2#, Leaf3#, Leaf4#, and addresses ...
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1answer
48 views

Traveling Salesman Problem (TSP) applied to network routing protocols? [closed]

Is this very common for larger enterprises that have many thousands of servers to use something like ant colony or similar algorithms to work together with network routing protocols like BGP to solve ...
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2answers
61 views

Point to point link with two Internet connections

Thank you in advance for reading this question. I have two buildings, let's say A and B, each connected to the Internet. Devices in A also need to access devices in B and vice-versa. The Internet ...
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2answers
46 views

Routing question on a Cisco router

I have a quick question regarding routing (on Cisco routers If I need to be specific). It's related to an issue I'm looking at for a client. They have an application being hosted on a server (...
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26 views

How can I configure a Cisco router 4300 to allow internal server ip:80 to be accessed on public ip:4500

I have an internal web server on port 80. I need help commands maybe to configure port forwarding to access the server on my private network from a public IP Current running config interface ...
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1answer
56 views

EIGRP to BGP to EIGRP

I would like to ask if it is possible to implement eigrp routing sent through bgp? I wanted to route from PC-1 to PC-2 using EIGRP. The connection between all of the three routers are through BGP ...
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26 views

Cisco PPTP server available routes protocol

I have a 2921 Cisco router in one place, and a Windows XP computer on another. I made my Cisco router as PPTP server, and my XP computer as a client. The router is located within a LAN with address ...
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2answers
141 views

Internet Scale Routing Table Size

In the link below, it is said that there are near one million prefixes for IPv4. https://bgp.he.net/report/netstats I want to know that it is a must for ISP routers to cache all these million IPv4 ...
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1answer
39 views

Header fields for IP fragments?

I am reading about computer networking and wanted to solve some related problems provided in the book. However, for this problem, no solution has been provided by the authors so I do not know my ...
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2answers
150 views

Configuring a network for 100% isolation (for security)

I'm configuring a LAN for an office. It's a new setup, and therefore there are desktops but no servers and no PC-to-PC communications - everything is on the cloud. The exception to this are several ...
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0answers
43 views

Is there a way to check which routes are matched by a term in a routing map?

I have created a prefix-list and I am using it in a route-map. However, my route-map is not working as I expect it to work. ip prefix-list LIST_A seq 5 permit 10.20.20.0/22 ge 32 route-map A-B-OUT ...
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1answer
114 views

How to read a BGP table?

I have come across BGP looking glass where I can see the routing table for public routers. Please find below a public entry: BGP routing table entry for 78.97.0.0/16 Versions: Process ...
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13 views

Building simple network configuration [duplicate]

For the below network configuration I need to propose an IP addresses, netmask and anything else obvious that I am possibly forgetting. The network is built of four Computers, Router and a Switch. I ...
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1answer
49 views

Transient looping problems in Link State Routing versus Persistent looping problem in Distance Vector routing

Can someone please explain how looping problem is transient in case of link state routing, but is persistent in distance vector routing.(maybe with a nice example) Thanks in advance! :)
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1answer
42 views

Will Main Router be overloaded in this scenario?

The Main router in my planned office network assigns IP addresses to all PCs through DHCP and also connects to the internet via GPON modem. 5 PCs and 1 server are connected to a 8 Port simple switch. ...
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1answer
33 views

Two sites with public IP's in same subnet. Spoof detection

I have encountered an non standard issue and can't seem to figure out a way to get it to work. I have 2 sites, 1 main and one branch. At the main site I have 2 ISP's and the branch I have only 1 ISP....
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1answer
16 views

Ping time varies between two devices in the same LAN [closed]

I am trying to ping between two devices A [Server] and B[Router]. From A to B the average ping response is about 1ms and from B to A is 0.5ms which is half. As a result, if I scp a file to B, by ...
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1answer
45 views

Sonicwall: force all traffic from specific source through VPN

We have a main office (M) with a Sonicwall TZ215, and a branch office (B) with a TZ210. Computers in B access the server in M through a site-to-site VPN between the two Sonicwalls. Internet traffic ...
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2answers
115 views

What does the BGP protocol consider when determining the best path?

What does BGP protocol consider when determining the best path? Why is it considered the slower than interior routing protocols like RIP, OSPF, etc?
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0answers
23 views

Is it possible to access 127.0.0.xxx in anyway [closed]

So I've been configuring my network at work. We've got a lot of devices from NAS servers to Dante AoIP devices. While configuring some of my devices I managed to set the IP adress of one device to ...
3
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2answers
51 views

MPLS : who owns the ingress & egress routers?

I'm trying to understand MPLS. It states that the routing doesn't happen at each router, and it starts with a "Label Edge Router". For example, if company X uses ATT as the provider for MPLS, then ...

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