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.

73 questions with no upvoted or accepted answers
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Where is the traffic going?

Here is a routing puzzle: I'm working on a poorly documented network, and I'm trying to document things as I discover them. R1 is a core L3 switch. R2 is a router. The FW is a, well, firewall. On ...
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1answer
5k views

Why is routing not working on my Dell N2048 switch

I am in the process of replacing some older Dell Powerconnect switches with a some Dell N2048 switches. While doing this I wanted to go ahead and segregate certain areas of my network using VLANs. ...
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125 views

Is this a valid OSPF topology?

In the following topology: every Backbone router is an ABR. Router 2 belongs to three different areas, area 0, area 1, and area 4. is this a valid topology for OSPF ? it works as expected and it ...
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443 views

Policy Based Routing (not matching packets) - Virtual Template

I have this configuration runnning : Larger image I tested the policy based routing int the lab using two linksys router acting as ppp clients of the Cisco 7206VXR and another linksys emulating the ...
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45 views

EIGRP Adjacency Table

From Cisco IP Routing by Alex Zinin According to this figure Adjacency Table gets messages from DUAL module also.As far as I know, Adjacency Table is populated only because of Hello packets exchanged ...
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RPL: questions on routing mechanism

I'm studying RPL and two questions came to my mind: 1: Both in storing and non-storing modes, if a node wants to send a packet to another node via P2P communication paradigm, then how does the ...
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171 views

Cisco ISR Zone Based Firewall dual stack not matching returning traffic for ipv6

I have a bit of a problem with my Cisco 1921 ISR config. I have ipv4 (obviously) and also native ipv6 connectivity in my home lab. I am trying to set up the zone based firewall. With ipv4 traffic, the ...
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203 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 ...
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1answer
447 views

Cisco 2960 not receiving dhcp from the router

I have a problem with Dhcp of some the Vlans. here is how my network is : I have a router ASR1001, which connects 15 switches(2960) as a ring topology. each switch has a subinterface of the router ...
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1answer
2k views

Sonicwall TZ105 Site to Site VPN Created can ping gateways but can't ping network from other site

Need help here Site B TZ105 x0 Lan 192.168.162.1 X1 WAN 64.x.x.x X2 LAN 10.0.3.1 Site A TZ300 X0 LAN 10.0.1.1 X1 WAN 69.x.x.x VPN tunnel set up as VPN SITE TO SITE and is Green From Site A I ...
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155 views

VPLS interface on router switched to other interface on same router

I have a router, R1, that is serving as a default gateway on a network segment. Let's say port eth0 has an ip of 10.0.0.1/24 and is connected to a switch, S1. Another port on the router, eth1, is ...
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312 views

ip routing preference problem

On my Huawei CE12800 device, I am trying to run this config. Beside a standart BGP process, I am using three community values to control traffic with my upstream provider. With 555 community value, I ...
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435 views

Is there any way to view the current queue size for a BGP neighbor in the Bird routing daemon?

Using a Cisco or Juniper routers you can see the size of the output queue value by showing the bgp summary. This information is also available when showing the detailed neighbor information. e.g. ...
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561 views

How to force route for MIP in screenos, multiple ISP untrust

Scenairo: SSG140 in HA configuration. Four interfaces: LAN (trust) eth0/0 172.20.0.0./24 ISP1 (untrust) eth0/1 1.1.1.130/28 ISP2 (untrust) eth0/2 2.2.2.194/28 ISP3 (untrust) eth0/3 3.3.3.130/28 ...
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1answer
12k views

Vyatta static routing does not correctly route to next hop

I configured static route using Vyatta like following: set protocols static route 192.168.1.0/24 next-hop 10.100.0.204 But a packet which destination is 192.168.1.10 is not routed to 10.100.0.204. ...
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1answer
24 views

Routing between two sites using FTTC Broadband and E-Band Wireless

I have two sites, both with 80/20 FTTC broadband connections that terminate at the standard white box BT modem. The connections both have fixed IP. I’d like to connect these up to each other and form ...
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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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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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244 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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496 views

Even ips pinging but odd ips not pinging

We have following network, and i have multiple host connected to TOR switches configured with public IPs. We have HSRP running on vPC switches. interface Vlan100 description *** Public VLAN *** ...
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297 views

HP ProCurve 6120XG with Cisco configuration

ProCurve 6120XG Blade Switch with Cisco trunk I have c7000 HP blade Center with ProCurve 6120XG Blade Switch and i am creating trunk to my TOR1 Cisco switch (Nexus 3064), but having issue related VLAN ...
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244 views

OSPF NSSA - Type 7 LSA Metric Changes Unexpectedly

When a new path to an NSSA External (LSA type 7) route is brought up in the topology below, the existing path's cost to that route increments to exactly match the new path's cost. Therefore, both ...
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519 views

Logical-Tunnel Interface Juniper MX 480 doesn't “work”

I have configured a logical tunnel between my master-routing-instance and a additional routing-instance. I tested the same config (except IP addresses) on my lab-system and on one of our other core-...
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3answers
3k views

Juniper EX how to clear route forwarding table?

After layer 3 routing a large IPv6 assignment on an EX Juniper switch, the route forwarding table filled up and some entries corrupted or became otherwise invalid. We want to clear the whole table. ...
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69 views

Policy routing with IS-IS

three routers are connected where Router A connected to router B A (gig0/0/0 ip address 10.10.1.1)====> B(gig0/0/0 ip address 10.10.1.2 A(gig0/0/0=> ip address 10.11.1.1===>B(gig0/0/...
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230 views

OSPF question from ISP perspective

Was hoping for some advice regarding an OSPF solution for a customer. Basically the customer has about 4 sites. These would all be linked together physically. I have attached a basic network ...
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2answers
354 views

IGP between 2 routers with an uncooperative router in the middle

I've got two routers, A and B. A gets some routes over BGP over a VPN connection, and has a leg on 10.0.0.0/24. It also can access the whole 10.0.0.0/16 via its default gateway. B is on 192.168.0.0/...
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38 views

Unicast forwarding in RBVT-P routing protocol

As known, Road-based using Vehicular Traffic Proactive routing (RBVT-P) is an unicast algorithm whose uses CPs (Connectivity Packets) for route discovery The confusion here is that CPs are sent in ...
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26 views

The relation between street-aware routing in VANETs and V2V communication

As known, RIVER protocol is a geographic, V2V, street-based protocol which relies on anchor points (intersection points). How can it detect these anchor points without resorting to fixed ...
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857 views

Site-to-Site VPN: Can't ping between two routers through cloud

I'm trying to simulate a Site-to-Site VPN. This is what my network looks like: The VPN tunnel stands for connecting Technology center router to R1, the running configurations for Technology center ...
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109 views

Firewall/Router not translating correctly

I am currently having trouble gaining internet access from the PC. Any suggestions or advice would be most welcome :) In order to diagnose a much larger issue, I have scaled my lab configuration ...
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199 views

BFD support for OSPF vyatta 6.2?

Is it possible to get support for BFD for OSPF on vyatta 6.2? I cannot find any information about it on the internet. The only thing I've seen is that the support is available on Brocade Vyatta 5400 ...
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488 views

Unable to receive return packets on Azure IPSEC VPN Connection

Trying to get the VPN tunnel to Azure working on a Cisco ISR 1941 but have been unable to get any traffic flowing back from Azure to site. The tunnel looks to be up and a machine in Azure is ...
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378 views

ASA not following default route

I have the following network which splits a site into a Corp/DMz style network as best I can with the limitations of the ASA in packer tracer. Both routers have static routes to the 10.100.0.0 and 172....
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130 views

Juniper EX4200 Public Subnet Vlan Routing

We have a Juniper EX4200 which is connected via ge-0/0/0 trunk port to the providers router. We got our own vlan(id 250) and there are two public subnets routed on this vlan. Currently all our serves ...
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586 views

BGP transitive attributes for single ASN multiple prefixes multiple neighbors

I believe I'm on the right track, but have stumble across something with advertising BGP prefixes to neighbors. I am wonder how if I have a single ASN with multiple prefixes (99.1.1.0/24 and 111.1.1.0/...
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Possible Network Plan? routed Subnets with www and Mail trunk

i mean the following is not possible.. We plan to create different Networks for Subareas with same Address-pools. With tricky Routing to use same IP-Settings on the Devices, there were moved around ...
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2k views

Dual Internet connections in active/standby mode without BGP

hello everyone attached is my diagram in which i am facing problem as you can see i have two internet links from two ISPs in which i want failover between two ISPs without using BGP or NAT because i ...
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113 views

Setting up WiFi with new Sonicwall across existing network

I am trying to set up a new WiFi AP in our HR building. There is a closet in the HR building, with a switch connected by fiber to our main network closet, then to another network closet where the ...
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360 views

wpa-aes EAP-peap authentication problem

I'm trying to connect ubiquity NanoStation M2 as Station/Router mode to a hotspot that I believe has WPA/AES security and EAP-PEAP for auth. I have tested the username and password from my laptop and ...
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3answers
81 views

Active\Passive Routers w\ BGP

What I'm trying to do is take two routers, "A" and "B" where 'A' is the primary router. Just like with active\passive firewalls and HSRP I want to "float" the default gateway between either Router A ...
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1answer
322 views

Configure E1 CAS signalling on a 2851 router

I have a 2851 VoIP router (CME) with four E1 ports. One port is configured as normal E1 PRI, and it is connected to PSTN. I want to configure another E1 port as a CAS signalling E1. I need to be ...
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13 views

Cisco ASA 5506: Adding two public IP's that are on the same subnet for the primary and backup interface

Im programming a Cisco ASA 5506. I need to add a primary (public) IP that is x.x.x.82/24 and a backup IP that is x.x.x.81/24. The ASA wont allow me to do this as it gives me an error: "the IP ...
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28 views

Issue with PIM-SSM Multicast Configuration ISR4431s

I have an issue with my PIM-SSM multicast configuration using ISR4431s.    I am wanting to forward broadcast data from an application from one VLAN in on the multicast source to another VLAN on a ...
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13 views

How does IP fragments assembled when identification number field is too small?

Please take reference from this question. It is said in RFC 6864 that if IP V4 IDs remain unique during MDL, it would limit speed to max 6.4Mbps. Now high speed devices generate data at a much higher ...
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21 views

why SLA Track 8 isn't applicable to my ISR Router

On a Cisco ISR 4451 I configure SLA Function as follow: track 8 ip sla 1 reachability ip sla 1 icmp-echo 10.1.1.81 source-ip 10.1.1.80 ip sla schedule 1 life forever start-time now And then I want ...
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22 views

Flapping MAC address issue on the uplink routed port

The scenario is like, in my VLAN 30 network, randomly one device stops communicating and when I check the Cisco L3 Stack switch, it shows the following error messages: Jul 27 13:59:55: %SW_MATM-4-...
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1answer
38 views

What's the point of aggregate routes when the default preference is reject?

studying for my JNCIS-SP and finally digging into the minutiae. I'm trying to grasp the default behavior of aggregate/summary routes. Why are these a reject? Maybe I'm just using them wrong, but here'...
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30 views

Ping over WAN to LAN (and from server to hosts)

I have a network similar to the one shown at the picture below. The main aim is to get connectivity between antivirus server (10.100.10.9) and hosts placed behind their LAN-gateway (network 10.200.1....
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22 views

router not learning the default route announced by RIPv2 if the same route exists via a better path

Let's say, that one has a following simple network topology: r1 ◄ ► r3 ▲ ▲ ▼ ▼ r2 ◄ ► r4 All four routers speak RIPv2 on all interfaces. r1 and r2 announce the default route which means ...