Routers

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A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

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If you can provide any feedback on Asus RT AC3100 Dual Band Router it's much appreciated. We've installed them in many locations and they've performed without any problems. We install one as the router and another AiMesh.

This one particular installation one was purchased bad so we replaced it. After this the network ran great however there seems to be some concerns between the ISP and our configuration why all of a sudden the DNS resolution is lagging 30-40 seconds and sometimes sites don't load at all. I believe the issue is on the ISP side and a technician is scheduled to be onsite. Prior to the technician I noticed the guest network randomly disappears. I enable it and it works for a bit. While I'm waiting for the ISP technician thought I'd pick EE for feedback on this device.

Thanks in advance.
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Amazon Web Services
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Hi Anyone can help to resolve the problem? I want to connect a switch 3560 to switch 4508. After configring the two port as trunk, the 3560 is always up and down, and i got the below info from 3560. i changed cables several times, but it cannot work. Thank you



00:51:40: %ILPOWER-7-DETECT: Interface Gi0/2: Power Device detected: IEEE PD
00:51:41: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/2: PD removed
00:51:45: %ILPOWER-7-DETECT: Interface Gi0/2: Power Device detected: IEEE PD
00:51:45: %LINK-3-UPDOWN: Interface GigabitEthernet0/2, changed state to up
00:51:46: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/2: PD removed
00:51:48: %LINK-3-UPDOWN: Interface GigabitEthernet0/2, changed state to down
00:51:51: %ILPOWER-7-DETECT: Interface Gi0/2: Power Device detected: IEEE PD
00:51:52: %ILPOWER-5-POWER_GRANTED: Interface Gi0/2: Power granted
00:51:53: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/2: PD removed
00:51:55: %ILPOWER-7-DETECT: Interface Gi0/2: Power Device detected: IEEE PD
00:51:56: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/2: PD removed
00:51:57: %ILPOWER-7-DETECT: Interface Gi0/2: Power Device detected: IEEE PD
00:51:58: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/2: PD removed
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hello - I'm no newbie on technology but my network terminology and detailed understanding is limited. I'm trying to replace one sites current Cisco 2900 router with a USG pro 4. The configs on the Cisco router show their eth0/0.1 to have "encapsulated dot1q" on vlan 330 with a 10.0.0.2 /24 ip on it.  This site is a end point site that rides a ISP's Ethernet circuit to another site called the hub site.  Both the hub and end point site can talk to each other without issues and both go out to the internet at the hub site.  So the hub site has two circuits, one for Ethernet (which is for the end point site connection) and another circuit for internet.  This is not a vpn site to site setup.  

I know vlan 330 is the tag the ISP put on their Ethernet circuit and I am aware of subnets but I'm not sure exactly what the dot1q means in regards to this setup.  Can the USG pro 4 router be configured in a similar fashion as the cisco router I've explained above?
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I'm trying to allow WOL from the WAN (X1) to a PC on the LAN (X0)
I used IP helper , but  i can see in the packet monitor it is dropped
How do I trace the problem ?

Packet number: 31*
Header Values:
 Bytes captured: 144, Actual Bytes on the wire: 144
Packet Info(Time:06/14/2019 02:23:08.576):
 in:X1*(interface), out:--, DROPPED, Drop Code: 702(Packet dropped - Policy drop), Module Id: 27(policy), (Ref.Id: _1857_qpmjdzDifdl), 1:0)
Ethernet Header
 Ether Type: IP(0x800), Src=[cc:e1:7f:7f:e8:07], Dst=[18:b1:69:bc:d8:29]
IP Packet Header
 IP Type: UDP(0x11), Src=[185.188.32.22], Dst=[176.21.81.50]
UDP Packet Header
 Src=[49666], Dst=[7], Checksum=0x1ea7, Message Length=110 bytes
Application Header
 Not Known: 

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I current have a customer that is constantly being readded to a blacklist . We have done some analysis of the firewall logs and notice a Mac address that is constantly occurring with a description of port scan detected. We have done analysis all switch Mac address tables and we are unable to find it . The IP address associated with the Mac address keeps changing and is also at time a public address . We also segmented the network and disconnected all wireless routers for a time period however after some time the same error reoccured .
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Configuring Cisco Switches

sw
I have the topology above...
both switches can see both routers mac addresses but cannot ping each other

R1#sh ip interface br | inc up
Ethernet0/0                192.168.12.1    YES manual up                    up  
R1#

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SW1#sh mac address-table
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
   1    aabb.cc00.0400    DYNAMIC     Et0/1
  10    aabb.cc00.0100    DYNAMIC     Et0/0
Total Mac Addresses for this criterion: 2
SW1#

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SW2#sh mac address-table
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
   1    aabb.cc00.0400    DYNAMIC     Et0/1
  10    aabb.cc00.0100    DYNAMIC     Et0/0
Total Mac Addresses for this criterion: 2

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R2#sh ip interface brief | inc up
Ethernet0/0                192.168.12.2    YES manual up                    up  
R2#

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R1#sh interfaces e0/0
Ethernet0/0 is up, line protocol is up
  Hardware is AmdP2, address is aabb.cc00.0100 (bia aabb.cc00.0100)

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R2#sh interfaces e0/0
Ethernet0/0 is up, line protocol is up
  Hardware is AmdP2, address is aabb.cc00.0400 (bia aabb.cc00.0400)

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But I still cannot ping between R1 and R2


R1#ping 192.168.12.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.12.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R1#

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The client wants Ruckus wireless access points for a large apartment, to replace their old access points.

They currently have 3 access points connected to a FIOS router
They have:
  • Several Honeywell thermostats that can be controlled by WiFi
  • Several Smart TV's
  • Multiple Sonos devices
  • A few computers, phones and tablets.
  • A few other devices

Which model do I need to get? (they vary in price)

The Access points would be connected to Ethernet
It would be useful to have 2 Ethernet ports, in case they need to attach a switch or other network devices to the Ruckus
A guest network is needed
POE isn't necessary
I would like to check the status of the access points remotely

From what I've seen, there are models that don't require a Ruckus 'hub' for configuration

Thanks.
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Configure OSPF at the Interface  or Global Config level

I have configured OSPF at the Global Config level , then when I checked if OSPF configuration trickled down to  the interface level, but it has not.

R3#sh ip ospf int s0/0
%OSPF: OSPF not enabled on Serial0/0

So I am just wondering in which case you configure OSPF at the Global Config level and  in which case you configure it at the interface level

Thank you
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I cannot connect my LAN to the internet
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ASBR Without Valid Area

I have noticed when I redistribute connected subnets  on OSPF Stub Area I get the message below :

R3(config-router)#redistribute connected subnets
R3(config-router)#
*May 20 21:12:59.726: %OSPF-4-ASBR_WITHOUT_VALID_AREA: Router is currently an ASBR while having only one area which is a stub area

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However OSPF will still take that command as shown below:

R3#sh run | sec ospf
router ospf 1
 area 1 stub
 redistribute connected subnets
 network 192.168.23.0 0.0.0.255 area 1
R3#

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So any one can explain the meaning of that message ?

Thank you
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ABR in Stub area not blocking External Routes
ar
In the topology above I have configured R2 area 1 as stub the same for R3
R3 is blocking External Routes E2 and injecting IA default routes, but R2 is still allowing E2 [External routes]

R2#sh run | sec ospf
router ospf 1
 area 1 stub
 network 192.168.12.0 0.0.0.255 area 0
 network 192.168.23.0 0.0.0.255 area 1
R2#

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R3#sh run | sec ospf
router ospf 1
 area 1 stub
 network 192.168.23.0 0.0.0.255 area 1
R3#

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R2#sh ip route ospf
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is not set

      7.0.0.0/32 is subnetted, 1 subnets
O E2     7.7.7.7 [110/20] via 192.168.12.1, 00:41:55, Ethernet0/0
      9.0.0.0/32 is subnetted, 1 subnets
O E2     9.9.9.9 [110/20] via 192.168.12.1, 00:41:55, Ethernet0/0
      11.0.0.0/32 is subnetted, 1 subnets
O E2     11.11.11.11 [110/20] via 192.168.12.1, 00:41:55, Ethernet0/0
O     

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NSSA Default-Information-Originate

I would like to know  the OSPF area type where we use  the command NSS Default-Information-Originate

---On Stub area : we configure all routers inside the are with : Area X  Stub
--- On Totally Stub : we configure all routers inside the area with :Area X Stub, and the ABR with Area X Stub Non-Summary
---On NSSA area  : We configure all routers inside the are with : Area X NSSA
--- On Totally NSSA: We configure all router inside the are with : Area X NSSA and the ABR with Area X NSSA Non-Summary

However I am not sure how we call the area type where we configure :NSS Default-Information-Originate


Thank you
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OSPF  Default Routes IA vs N2

I would like to know in which case OSPF Default Routes would show as :
IA 0.0.0.0/0

or

 N2 0.0.0.0/0

Thank you
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OSPF Routing table not showing OSPF Routes
os
in the topology above

I have configured ospf on R5,R6,R8,R9 in Area3 , however the OSPF routes show only on R5 and R6 but not for Area3 ,  R8 and R9 do not show OSPF routes in their table
I can ping between all 4 routers

Though every now and then a message about OSPF Adjacency comes up on the console
*May 17 21:46:07.003: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.99.9 on Ethernet0/0 from LOADING to FULL, Loading Done
but when I run Show IP Route , no OSPF routes show up

R8#  sh ip route
      192.168.99.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.99.0/24 is directly connected, Ethernet0/0
L        192.168.99.8/32 is directly connected, Ethernet0/0
R8#

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R9#show ip route
      192.168.99.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.99.0/24 is directly connected, Ethernet0/0
L        192.168.99.9/32 is directly connected, Ethernet0/0
R9#

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it looks like that there is also Neighborship formed:
R8#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
192.168.99.5      1   2WAY/DROTHER    00:00:35    192.168.99.5    Ethernet0/0
192.168.99.6      1   FULL/DR         00:00:33    192.168.99.6    Ethernet0/0
192.168.99.9      1   FULL/BDR        00:00:[code]

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[/code]

R5 and R6 OSPF table does not show the OSPF routes for Area 3 which is the Network 192.168.99.0/24

R5#sh ip …
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Can a VPC A in account A use an AWS Private Link or other means to get to a VPC B in account B and then reach a corporate destination over a Direct Connect link connected to VPC B?

Say EC2-1 has 172.18.5.10 and is trying to reach 10.5.5.5 on the corporate network. VPC B with subnet 172.17.0.0/16 already has a Direct Connect link to the corporate data center and already reach es10.5.5.5. What could I put in place to allow EC2-1 to hop through VPC B and get to 10.5.5.5?

Thank you.
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Hi If we want to install SD-WAN, we need to buy devices, at least, vEdger。but not sure if we need to buy other devices, such as vSmart, vBond etc. I think the last two are virtual ones, and as long as we buy the service, we can get these. I am not sure what steps or other devices we need to setup SD-WAN for enterprise network. Anyone can give some general ideas? Thank you
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My LAN is on a subnet 172.18.2.x. I am running out of IP address. What I would like to do is tale all the switches, wireless bridges, etc. and move them to a different subnet but I really want them to have internet access for firmware updates and such. So.... can't I take a cheap little router, plug the WAN port in to the 172.18.2.x subnet (which will give that router internet) then plug one of the LAN ports on it also in to the 172.18.2.X? That is assuming the the cheap has a subnet like 192.168.0.0

   It mean essentially that the cheapo router will have both a WAN and a LAN port connected to the 172.18.2.x subnet but couldn't I, at that point, change all my "non-critical" devices to the 192.168.0.0 subnet which will still let me get to them and give those devices internet?
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GRE Tunnel Vs IP Sec Tunnel
I have done some reading online to understand the Difference between GRE Tunnel Vs IP Sec Tunnel, but it is not clear enough

IPSec  as well as GRE Tunnels encapsule IP Packets
IPSec encrypts the Packet , but GRE Does not.

SO when should I use IPSec and When should I use GRE ?

Thank you
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OSPF  with Frame Relay

I have the attached Chart below, courtesy of Justincase EE:

I wanted to understand what they  mean by Full Mesh required.
I used in a Lab Hub Router ---Frame Relay Switch--- and 2 spokes, which I believe it is not Full Mesh
and tested Non-Broadcast and Broadcast and both worked. So I am not sure why it says Full Mesh Required.

Thank you

nb
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IP OSPF Network Point to Point on Frame Relay

os
I have configured IP OSPF Network Point to Point on R1,R2,R3 serial0 Interfaces.

however from R1 , I do not see both neighbors together, it keeps showing sometimes the 2.2.2.2 which is R2 and sometimes 3.3.3.3 which is R3
I am not sure why it is doing this flapping.

Any help will be very appreciated

Thank you

R1#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
3.3.3.3           0   FULL/  -        00:00:38    123.0.0.3       Serial0/0
R1#

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R1#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
2.2.2.2           0   FULL/  -        00:00:38    123.0.0.2       Serial0/0

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I wonder if the reason that neighborship is flapping because all 3 routers are in the same subnet, and Point to point requires that they need to be in separate subnets ?
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Network Type POINT_TO_MULTIPOINT  and POINT_TO_MULTIPOINT Non_Broadcast

I have configured  a serial interface with IP OSPF Network POINT_TO_MULTIPOINT then later with POINT_TO_MULTIPOINT Non_Broadcast,  then I realized in both cases when I run : show ip ospf interface s0/0, I see Network Type POINT_TO_MULTIPOINT[/b] only, there is no Non_Broadcast keyword added.

Any idea ?

Thanks

R1#sh ip ospf inte s0/0
Serial0/0 is up, line protocol is up
  Internet Address 123.0.0.1/24, Area 0, Attached via Interface Enable
  Process ID 1, Router ID 1.1.1.1, Network Type POINT_TO_MULTIPOINT, Cost: 64
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Hi, i have 2 Cisco ASA 5506 firewall with Sec+ licenses. I am configuring them for HA as well as WAN failover.

Now, on the WAN failover side, do i need to have unique public IP addresses for both WAN links to each firewall?

For ex:
WAN1 (ASA1) - 192.168.1.1
WAN1 (ASA2) - 192.168.1.2

I know on sonicwall this is not required.
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Hi I am not very clear about relation between Riverbed and SD-WAN. I think Riverbed is wan accelerator locally, and SD-WAN  is also WAN accelerator globally. Do you think i am right? Thank you
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OSPF LSA  Updates and Hellos

on the Screenshot below , we have DR and BDR

I want to know if other routers will have to send an update(LSA type 1) to DR and BDR, or they will send an update (LSA type 1) just to the DR, and the DR will send (LSA type2) to all the routers including the BDR

OR

Other Routers  will  send an update(LSA type 1) to 224.0.0.6 then DR and BDR will get the Update but only the DR that will send (LSA type 2) to 224.0.0.5 (where all other routers are listening to)

in case of the second case , I wonder how does BDR get LSA type 2 from DR

Thank you

DR
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Frame Relay Interfaces

When configuring Frame Relay Interfaces , I have seen sometimes they configure the physical interface with frame relay encapsulation,Ip address, frame-relay intf-type dce, etc...

Sometimes the physical interface is configured just with encapsulation frame-relay, then they create subinterfaces. In the sub-interfaces there are 2 options Point to point and point to Multipoint.

Any Expert to explain when should I configure everything on Physical Interface, and when I should configure subinterface as point to point and when should I configure it as point to multipoint

Thank you
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Routers

47K

Solutions

30K

Contributors

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.