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.
2,208
questions
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Fake Base Station [closed]
I am doing my research about how to find a fake base station using machine learning. I captured features like 'Packet number',' Size (B)',' Layers',' Packet Information Summary', and ' Time Difference ...
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0
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4
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PBR + SNAT + NFTABLES MULTI IFACE = SETUP FOR LAN HANDLING UNDER DEBIAN SERVER [closed]
i want to setup the base for my local net 10.10.0.0/16 i stuck with such initial config:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/...
- 101
0
votes
1
answer
56
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Fortigate IPsec site-to-site routing issue
Site A needs IPsec with site B.
Site A networks 192.168.20.0/24 and 192.168.50.0/24 need to reach Site B network 192.168.1.0/24. And the other way around as well.
The problem is that Site A has a ...
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1
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34
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How can I determine whether requests to my web server are coming from hosts directly connected to the switch or from neighboring switches?
I have a Linux host connected to a layer 2 switch where I’ve set up a web server using Laravel. On this web server, I need to identify the source of incoming requests: whether the requester is ...
- 165
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34
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IEEE 802.11s Mesh: IP Address to MAC Correlation?
I'm attempting to better understand IEEE 802.11s wireless mesh networks and I don't understand how IP addresses are correlated to MAC addresses if the mesh channel has a different MAC address than the ...
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1
answer
41
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How to combie port forwarding and PAT on Cisco router?
I have a problem, that I cannot bring together working PAT and Port forwarding on a Cisco router.
Here is my topology:
Explanation to topology:
Start connection sourced by 192.168.1.1 with ...
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3
votes
1
answer
83
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Unable to Assign IP Address to FastEthernet Interface on Cisco Router
I am currently working on some Cisco Packet Tracers project and I have run into some problems when trying to configure an Ip address to a FastEthernet Port.
For more context I am using a 2901 Router ...
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2
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76
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Must an autonomous system be internally fully connected?
Must every part of an autonomous system be connected inside the system to every other part, or can it be split in two (or more) distinct parts which are only connected through other autonomous systems?...
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3
answers
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Does a router lookup in routing table twice for each packet?
A router structure would look like linecards all connected by a routing fabric(switchplane) so if a packet is received by a linecard it will remove the ethernet header then make changes to ip header ...
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1
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75
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Juniper EX4650 unable to connect to anything
I have recently ran into a problem, where I have tried setting up routing from interface vme to our gateway and for some reason it is unable to ping or connect to anything.
What I have tried:
...
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1
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41
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Default Route Excluding VLAN on HP switch
I have configured HPE 5710 Layer 3 switch with multiple vlans. The Default Static Route displays it's interface as Vlan10, I am able to ping 8.8.8.8 from addresses in that vlan, including the switch ...
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1
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78
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How do ISPs assign /29 public IP subnet on a single Ethernet/Fiber connection?
I recently found out the ISP provides a /28 public IP subnet to a business. I'm in the process of learning more about networking and find it interesting that 16 addresses are available through that ...
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Why do routing tables and arp tables both require a field of interface?
Routing tables are queried using destination IP of a packet to get the next hop IP and to get the interface to send the packet through.
But since the router will strip the ethernet header first and ...
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1
vote
1
answer
50
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Why redistributed routes do not overwrite the original ones?
I am looking a bit into mutual redistribution and I am trying to find out how a router decides which routes to redistribute and why.
R1 --ospf-- R2 --rip-- R3
Imagine the above scenario, in which R2 ...
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1
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63
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Should a router behind the internet gateway run source NATing or masquerading if the gateway router is masquerading?
Edit:
On a multi-router network, should a router (R2) behind the internet gateway (R1) run source NATing or masquerading if the gateway router is masquerading?
At this time I can ssh from a host on ...
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1
answer
98
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BGP - How are loops avoided when they are not caused by an AS_PATH cycle?
The standard answer I am seeing for how eBGP avoids routing loops is that eBGP routers of an AS will check each AS_PATH that is advertised to them and will discard the path if it contains their own AS ...
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2
answers
92
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Is the routing table a control plane concept or a data plane concept?
I've always been told that the routing table is a control plane concept. You build this table, collect the routes, the way they were learned, their metrics, and so on.
You then use this information to ...
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25
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How to generate the netconf configuration for traffic enginerring with Segment routing from the CLI commands on Cisco IOS XR platofrm
I have below configurations to be pushed via netconf :
Router Type :- IOS -XR
CLI :-
segment-routing
traffic-eng
segment-list ar4.BLB_ar7.BLB_c_10000_ep_1.2.3.4
index 1 mpls label 24001
index ...
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0
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34
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Is it possible to forward SMTP connections for various domains in the same server to different internal ports? [closed]
I have a server machine. If an incoming connection comes on https://abc.com:443, it's redirected to internal port :81 and if https://xyz.com:443, it's redirected to :82. This works fine.
Now I have 2 ...
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59
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Could address be omitted from packet in IPv4 if router is sending to / from that address?
Imagine an IPv4 packet routed like this:
A -> Router1 -> Router2 -> B
When constructing a packet per the structure, it seems A will have to include both source address (A) and destination ...
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1
vote
1
answer
54
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Nested Network with same IP Space
I have a router (Teltonika RUT) that is connected via its WAN port to a network (let's call it "Big").
The IP Space of the "Big" Network is 192.168.1.0/24 with the Gateway on 192....
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2
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174
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Connecting two different networks behind different firewalls [closed]
I have two LANs in the same building with different ISP and both behind different hardware firewalls connected to a switch like in the first picture bellow. Before, both LANs were connected through ...
2
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1
answer
101
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OSPF - is the Designated Router the same thing as the Master Router?
Is it possible, to have a DR as a Slave Router?
So here is my knowledge:
The DR and the BDR are elected based on priority and then highest RID in an area, so every router can communicate with the DR ...
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2
votes
1
answer
74
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How does the final next-hop router forward a frame to the destination device if the public IP address is that of its router
We know that all device’s connected to the same local network will have the same public IP address as each other, which belongs to their local router.
So, since the IP packet’s destination address is ...
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3
votes
1
answer
178
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Computers on different subnets can't talk to each other
I'm teaching an introductory computer engineering course in HS and had students in the lab network together the computers they built in the hardware unit - I appreciate the irony of somebody teaching, ...
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0
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89
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intervlan routing on cisco L3 stacked switches
I am new to this and I am having a bit of a issue trying to successfully perform intervlan routing on a stacked L3 switche(s).
I essentially have three SVIs with their corresponding VLANS ( i think)
...
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votes
1
answer
70
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Why MLS2 Doesn't Get ICMP Packet To Where It Should?
This is a Packet Tracer lab from Kieth Barker's website with minor modifications. It is intended to exhibit how can we get to the network 10.10.0.0/24 access to the Web Server 23.1.2.2/24 Using NAT.
...
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2
answers
75
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One Shop, Two ISPs. Will this work?
My retail shop uses Comcast Cable (calling it CC going forward) as the ISP. I just added Verizon 5G Business internet (calling it VZ going forward) as the backup for the times when CC is down (which ...
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6
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3
answers
722
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Can ARP tables store addresses for other networks?
This is perhaps a weird question, but I'm in a weird situation where I want to route traffic from network A 192.168.1.0/24 to network B 192.168.2.0/24 via 192.168.1.5 (the address of B-router in the A ...
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1
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1
answer
85
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Cisco BGP RTBH in EVPN fabric
I have Cisco basic EVPN fabric configuration in DC with two spine and couple of leafs using OSFP+iBGP for underlay fabric. My border leaf connected to my ISP using Vrf CUST. I want to configure RTBH ...
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1
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iBGP exchange all routes?
1.1.1.0/24 1.1.1.0/24
[community 100:1] [community: 200:1]
[as path 100 300 500] [as path 200 500]
eBGP peer (AS100) eBGP peer (AS200)
\ /
\ ...
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answer code block juniper table routage [duplicate]
want some one expert juniper help me for this question
user@router> show route 192.168.100.2 inet.O: 15 destinations, 17 routes (15 active, 0 holddown, 0 hidden) Limit/Threshold: 1048576/1048576 ...
2
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2
answers
93
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STP related question
Hi this is a portion of my current set up..
All vlan ports are untagged. Everything works and communicates fine until a connection is made between the 2 switches it takes down the network and the pc ...
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0
answers
486
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Trouble configuring BGP policy 'next-hop self' in JunOS
Networking Community,
Problem: I am struggling with applying the correct BGP “next-hop self” policies in JunOS.
Background: I have been brushing up setting BGP policies, e.g. ‘direct’, ‘next-hop self’,...
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1
answer
132
views
Why is there overlap with two interfaces?
I am trying to configure router0, I assigned ip 192.168.26.1 to gigabitEthernet 0/0 and I tried to assign this ip: 192.168.26.33 to interface serial 0/0/0 but this error appears:
192.168.26.0 overlaps ...
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1
answer
93
views
Static route weird behaviour
Hi,
I am working with 4 routers: A B, P and C
A and B have a P router between them that has an ospf neighborship with both. B is directly connected to router C. There's no routing protocol between B ...
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0
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1
answer
44
views
Public wifi router conflicts with company VPN IP address [closed]
I'm a digital nomad and I like to work in cafes and co-working spaces. The problem is that sometimes the network router IP address conflicts with my company's VPN-client IP address.
Any and all ...
- 101
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1
answer
68
views
How to access SVI from the other side of a tunnel? [closed]
With two vlans separated by an IPSec tunnel, I'm having issues reaching an SVI on the far end. Hosts on either end can ping each other without issue, but the SVI's do not respond from the far end, ...
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2
votes
1
answer
172
views
which protocol is invoked first by routers ? routing (routing table) or ARP?
I have a question regarding the internet layer of the TCP/IP model: When a data frame is sent by a client to a server located on another network, we know that the routing tables and the ARP protocol ...
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1
vote
2
answers
149
views
Can the Cisco SF302-08 switch support IP routing capabilities?
I'm currently working on configuring inter-VLAN routing on a Cisco SF302-08 switch. I've already enabled Layer 3 routing, created the VLANs, assigned them to switchports, and configured the switch ...
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2
votes
2
answers
75
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what information needs a router to make a decision?
How does a router that receives a packet know what to do if it doesn’t know the subnet mask of the IP that sent the packet? The reason for asking this is that I didn't see any field in the IP header ...
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1
answer
75
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Why will specifying the outgoing physical interface work for a static route with IPv4 and not for IPv6?
When setting up loopback interfaces with IPv6 addresses with static routes between two directly connected routers through their interfaces. It does not work to specify it with the outgoing physical ...
0
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2
answers
71
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IPv4 Address space for PTP links
I operate a relatively small ISP (around 1k households). We have passed the stage where a single router does not cut it anymore. As a corollary, we have to link routers to each other.
For this, we've ...
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1
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141
views
In a trace route, do routers that do not respond still forward the packets?
In traceroute,
The sender expects a reply within a specified number of seconds. If a packet is not acknowledged within the expected interval, an asterisk is displayed.
Pasting here the example trace ...
- 491
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1
answer
125
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Problems with twice-NAT on Cisco 3548
I'm trying to get Twice-NAT working on a Cisco 3548 switch. I have a VRF set up with 2 L3 ports on it -
Eth1/33 has ip address 20.20.255.250/16 and is nat inside
Eth1/34 has ip address 10.10.1.211/24 ...
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1
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168
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Can't ping between cabled interfaces on different VRFs on same switch (Cisco 3548)
As an experiment I've created a non-default VRF, directly cabled between an L3 port on the default VRF and an L3 port on the non-default VRF, and am trying to ping between them. Neither interface can ...
- 101
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1
answer
212
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Two switches connected to VyOS router - nodes connected to the second switch can't send or receive packets
I'm using VyOS 1.1.8.
I am having following set up in GNS3:
Devices connected to Switch1 are working properly. PC1 can ping PC3 and vice versa. They can obtain IP via DHCP.
PC2 can't be pinged even ...
1
vote
2
answers
317
views
what is the purpose of GRE in UDP encapsulation if its unidirectional
I was going through this feature of GRE called GRE-in-UDP encapsulation. The RFC says it is unidirectional and the tunnel traffic is not expected to be returned back to the UDP source port values used ...
- 113
1
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1
answer
138
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BGP: Are Virtual Internet Exchanges more efficient than normal internet transit?
There are a number of virtual internet exchanges that BGP peer over VPN links when local presence is not available. Given the IP encapsulation overhead, and the fact that these routes still cross the ...
- 209
0
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1
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48
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Is route from traceroute guaranteed to match the route packets will take in actual usecase?
Context
I'm working on a university project where I need to find out if it's possible to save electricity by hosting services locally and thus having to transmit data by smaller distances.
I've ...
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