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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39 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
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1answer
790 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 ...
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1answer
40 views

JunOS iBGP and return paths odd behaviour

I've got a somewhat basic iBGP configuration with a routing instance "global" between two Juniper vSRX's - each Juniper vSRX has an uplink of its own from a different transit provider with a default ...
4
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3answers
108 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 ...
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0answers
97 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:...
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1answer
75 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 ...
4
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1answer
156 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'...
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1answer
67 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 ...
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1answer
274 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 [...
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2answers
94 views

Gather the BGP data by using TCP connection on port 179

In order to gather the information shared between BGP peers, what port number should be used to connect using TCP (I am using 179, and don't see the connection being established)? Will I be able to ...
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1answer
49 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 ...
3
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1answer
303 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 ...
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1answer
277 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 ...
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0answers
51 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
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1answer
135 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). ...
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1answer
93 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 ...
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0answers
22 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 ...
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2answers
99 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 ...
5
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1answer
174 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 ...
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1answer
460 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
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1answer
1k 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
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1answer
193 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 ...
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0answers
34 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-...
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0answers
137 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
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1answer
312 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. ...
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1answer
515 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/...
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1answer
352 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 ...
4
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1answer
258 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 ...
2
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2answers
80 views

Question about Configuring HP 2920

I'm trying to configure an HP 2920 to do routing between VLANs. I'm working on setting up a guest wireless network and I want to prevent clients on the guest VLAN from accessing our main VLAN. ...
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1answer
88 views

Cisco numeric EIGRP routing IP summarizing and routing

I have 2 routers connected via Serial 0/0/0 both running EIGRP with an ASN of 65000, and i want to advertise and summarize the interfaces, being just my loopbacks, and set the loopbacks as passive. ...
3
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2answers
222 views

After I set the “router rip” networks, how can I check it?

In my CGR1240 I have set network 192.168.1.0 to my router rip, but how can I check it? If I add more networks in rip, how can I list all the networks I have added? I can not show the router rip in ...
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3answers
1k views

OSPF and its use of Multicast

When it comes to OSPF and its use of multicast, am I correct in believing that IGMP forwarding and an IGMP querier is still required within the local segment? My understanding would be without this, ...
6
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2answers
208 views

Issues with Juniper MX-series iBGP routes

I have a simple setup: 2x Juniper MX-Series routers each having one uplink to a transit provider iBGP session between both routers (point-to-point) For testing purposes I've disabled the uplink from ...
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2answers
42 views

Routing issue between a switch and AP on different networks

I have the following network below. The router is a Juniper SRX 550 with 3 networks. 0/0/2 (currently disabled) is 172.16.64.1 /18, 0/0/3 is 172.16.128.1 /18, and 0/0/4 is 172.16.192.1 /18. The ...
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2answers
320 views

Inter vlan routing not working

Apologies if any details not clear as I'm not a network expert. I have a Procurve 3500yl layer-3 switch. I am trying to make two VLANs and get a PC in one VLAN to connect to the other VLAN. Below is ...
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1answer
2k views

Single DHCP server for multiple VLANs (packet tracer)

I have a layer 2 switch, PC 1 connected to port 1 and PC 2 connected to port 2. Port 1 is in VLAN 20 Port 2 is in VLAN 21 Can I use a single DHCP server without a router and give IP to both the PCs?...
2
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0answers
25 views

How does BGP decide which prefix to advertise out of the prefixes in the routing table? [duplicate]

The ip routing table shows that I have 4 routes to reach 0.0.0.0/0. #show ip route 0.0.0.0/0 0.0.0.0/0, ubest/mbest: 4/0 *via x.x.16.6, [20/0], 2d, bgp-64500, external, tag 64500 *via x.x.17.4, [20/0]...
2
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2answers
62 views

Routing DHCP into different LANS

If I had a router that's connects my 2 LANs and there is a single DHCP, in the either LAN. How and what would be my configurations for the DHCP so that it provides the IPs to both the LANS through the ...
6
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3answers
2k views

Need help understanding how packets travel across the internet

I've been learning about networks recently at a new job, and I did a presentation on what I've learnt so far. When I was describing the relationship between the datalink and network layer, I mentioned ...
1
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1answer
426 views

Can ping default gateway, but no internet

I have a Cisco ASA 5506-X with following configuration: ! interface GigabitEthernet1/1 nameif outside security-level 0 ip address *.*.114.179 255.255.255.240 ! interface GigabitEthernet1/2 ...
4
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1answer
248 views

What is the exact meaning of routes in Juniper tagged with @ and #

The routing table explains the meaning of these symbols as: @ = Routing Use Only, # = Forwarding Use Only + = Active Route, - = Last Active, * = Both However, I am looking for more detailed meaning ...
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3answers
314 views

How a packet gets from source to destination or from client to server

I'm trying to understand how a packet gets from client to server. I understand that it leaves the local switch and heads to the internet to get routed to its destination but what happens inbetween? 1 ...
1
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1answer
53 views

Reach IP in Parent Network [closed]

We have a router (Router 2) inside a network (Router 1) with a client (Client in Router 2) that needs to make a TCP connection to a client in router 1. We only have access to configure Router 2 and ...
1
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1answer
56 views

Is the Backbone Area connected AS Area are through one router?

I am studying Networking, and I find the Area 0.0.0.1, Area 0.0.0.2 connect to the Backbone Area is through one path, is it means only through one router(or say not more)? we often hear that the ...
2
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1answer
404 views

Why use iBGP over eBGP?

Why would you use iBGP over eBGP. i.e why use a single AS with an RR over multiple AS's using eBGP. Is it simply for peering design simplification i.e large amount of devices all peering to a set of ...
3
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4answers
228 views

Does a router always have two IP addresses?

So I got pretty confused with this question, and while looking online I've found several answers saying that a router does need 2 IP addresses at a minimum, but it isn't clear to me why. Lets say ...
0
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1answer
109 views

How to differentiate between classful network and subnet (beginner)? [duplicate]

I have just started learning from the ICDN1 official Cert book. I've just covered the concept of Classful Networks. However when introducing Subnetting, the example has me confused. It examples an ...
2
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1answer
84 views

Static Routes and selection

For what I know, Static Routes don't have a Metric. So, what if a Router has more than one Static Route to a Network? Let's say that on the topology below we have Static Routes configured, and R1 ...
1
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1answer
92 views

Replacing IP address of connections from AWS towards SIP

We have installed a PBX on AWS and connected it to our on-prem Router via VPN. My on-prem router is connected to the SIP provider via a physical connection with another on-prem MUX device (device ...
4
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1answer
136 views

Track crypto map state when using Policy Based Routing on Cisco Router

I have kind of a challenge and need some advice if the configuration I want to do is actually possible. Please don't kill me, I know that the configuration is not very "nice"... We are using DMVPN ...