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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configure BGP  when Static Routes are used.

in the topology below we have 2 routers in 2 different AS numbers. If we configure  the 2 routers with static route or default route, so that they will have reachability
 then can we configure BGP  peering between the 2 routers based on their physical interfaces' ip addresses and redistribute connected networks, I wonder if BGP will have any  meaning, because Static or Default routes will be preferred over BGP protocol as their AD is lower than BGP AD.

Anyone to shade some lights on this ?

Thank you

stat
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Hi guy,
Got a telstra router.
Need some help setting up vpn for remote users, so they can access the local lan
- please have a look at the pic attached for my config. It says windows 7 option.
But I got windows 8&10 os. Will it work still ??
[embed=doc 1415116]
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BGP Next Hop

in the BGP configuration below, I am not sure why on R2 and R3 the next hop is not the IP address of R1 interfaces ,either( 192.168.12.1 or 192.168.13.1)
I mean on R2 to reach the loopback (3.3.3.3) of R3,  the Next-hop is showing the 192.168.13.3 and on R3 to reach the loopback(2.2.2.2) of R2, the Next-hop is showing 192.168.12.2
I thought the Next-hop should be the interfaces of R1either( 192.168.12.1 or 192.168.13.1)

I can ping 3.3.3.3 from R2 and 2.2.2.2 from R3

Thank you

bgp
R1#
interface Ethernet0/0
 ip address 192.168.12.1 255.255.255.0
!
interface Ethernet0/1
 ip address 192.168.13.1 255.255.255.0
!
router bgp 1
 bgp log-neighbor-changes
 neighbor 192.168.12.2 remote-as 1
 neighbor 192.168.12.2 route-reflector-client
 neighbor 192.168.12.2 next-hop-self
 neighbor 192.168.13.3 remote-as 1
 neighbor 192.168.13.3 route-reflector-client
 neighbor 192.168.13.3 next-hop-self

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R2#
interface Loopback0
 ip address 2.2.2.2 255.255.255.255
!
interface Ethernet0/0
 ip address 192.168.12.2 255.255.255.0

router bgp 1
 network 2.2.2.2 mask 255.255.255.255
 neighbor 192.168.12.1 remote-as 1
 neighbor 192.168.23.3 remote-as 1

ip route 192.168.13.0 255.255.255.0 192.168.12.1

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R3#
interface Loopback0
 ip address 3.3.3.3 255.255.255.255
!
interface Ethernet0/0
 ip address 192.168.13.3 255.255.255.0

router bgp 1
 network 3.3.3.3 mask 255.255.255.255
 neighbor 192.168.12.2 remote-as 1
 neighbor 192.168.13.1 remote-as 1

ip route 192.168.12.0 255.255.255.0 192.168.13.1

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R1#sh ip bgp
BGP table version is 7, local router ID is 192.168.13.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 *>i 2.2.2.2/32       192.168.12.2             0    100      0 i
 *>i 3.3.3.3/32       192.168.13.3             0    100      0 i
R1#

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R2#show ip bgp 
BGP table version is 3, local router ID is 2.2.2.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 *>  2.2.2.2/32       0.0.0.0                  0         32768 i
 *>i 3.3.3.3/32       192.168.13.3             0    100      0 i
R2#

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R3#sh ip bgp
BGP table version is 3, local router ID is 3.3.3.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 *>i 2.2.2.2/32       192.168.12.2             0    100      0 i
 *>  3.3.3.3/32       0.0.0.0                  0         32768 i
R3#

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R2#ping 3.3.3.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
R2#

R3#ping 2.2.2.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
R3#
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Hi,

TIA

I have 2 cisco routers which I am having problems VPNing between.

RV340W, firmware 1.0.02.16
IPSec Profiles
keying mode auto
ike version 1

Phose 1
DH Group 2 - 1024 bit
Encryption 3DES
Auth SHA1
SA lifetime 28800

Phase 2
Protocol Selection ESP
Encryption 3DES
Auth SHA1
SA Lifetime 28800
PFS enabled
DH Group 2 - 1024 bit

Site to Site
Enabled
IPSec Profile - points to above settings
int WAN1
Remote endpoint Static IP
remote IP entered

Remote IKE Auth Method
Pre-shared key, complexity disabled, 14 digit key enterd

Local Group Setup
Local Intendifier type - Local WAN  IP
Local ID - Local IP Address
Local IP Type - Subnet
IP address - *.*.*.0 (local subnet)
Subnet mask - 25.255.255.0

Remote Group Setup
Remote ID TYpe - Remote WAN IP
Remote ID - remote IP address
Remote IP Type - subnet
IP Address - *.*.*.0 (remote subnet IP)
subnet mask 255.255.255.0


2nd routers

Cisco RV180W

IKE Policy
Direction/type - both
exchange mode - main

Local
ID Type - Local WAN IP

Remote
ID Type - Remote WAN IP

IKE SA Parameters
Encryption algorithm 3DES
Auth Algorithm SHA1
Auth method  Pre Shared key
Pre shared key entered
DH Group 2 1024 bit
SA Lifetime 28800
Dead Peer Detection enabled
det period 10
reconnect after 3

Extended auth
none



VPN Policy

Policy type - auto
remote endpoint - ip address
remote ip entered
NetBIOS enabled

Local Traffice selection
local ip subnet
start address - …
0
BGP Originate and Origin type.
 
Looking at this link: https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html

Can someone explain the difference between BGP attributes : Originate and Origin type.

I looks like Bullet 3 and 5 in Cisco article have some similarity

Thank you
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IBGP Routers in Transit AS

in the topology below, we have 3 Routers in AS100, I would like to know in Cases:

Case 1:
Router E does not run BGP, then do we have to run IGP(OSPF,EIGRP,RIP) on all 3 Routers [Router A,E,B]  in order to have Router B able to forward EBGP traffic , that has been learned by Router A from AS 300 ,  to AS400 ?
In case we'll have to run IGP in all 3 Routers , then do we need to redistribute BGP into IGP on Router A ?


Case 2: Router E runs BGP as well as Routers A and B, in this case do we still need to run IGP on all 3 Routers in AS 100  or it is not needed?

Thank you



ibgp
0
I am trying to route traffic between a 172.x.x.x network to 192.x.x.x. We have Sonicwall routers in place. I understand a little about routing but I need some assistance with this setup. What should I do??
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Need to VLAN a flat network.  
I currently have a network and it is one large flat network with one subnet of 255.255.252.0 with a range of IP's 192.168.0.1 - 192.168.3.254.
All of my servers, routers firewalls, printers , copiers  and switches are within 192.168.1.1 - 192.168.1.254
My Workstations (Windows 10 )  are all receiving IP addresses from DHCP server and in the range of 192.168.2.50 - 192.168.2.250

I have been tasked with setting up vlan's for the entire network to improve security and performance

I currently have a 5 switches which are all 48 port switches and in  a stacked configuration with 40 GB uplink to a "Central" Switch. These 5 switches are considered our user segment which has workstations and Printers connected.

The Central switch is actually two 48 port switches that are stacked and have the Servers, routers and firewall connected.

my default gateway is a cisco Switch .

I'm looking for some guidance in multiple areas,
1. design ? how many Vlans , do I use vlan 1 ? I think my current configuration would mean everything is VLAN 1
2. Will I need to change my IP addressing of my enire network ? if so what would my new IP addressing look like. how would I g about changing without taking down the whole network.
3. Can the job be done slowly ?
4. Can a server ( DHCP ) on one Vlan provide IP Addresses toWorkstations on a separate Vlan ?

Thanks for any feedback
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Understanding BGP

in the topology below, I would like to know if an IGP (OSPF.EIGRP,RIP,etc...) has to be configured  between R4,R5,R6 , before R5 advertise eBGP Routes learned from R4 to R7 (AS5700)
Or IBGP between R4,R5,R6 is enough to get that accomplished.

Thank you


BGP
0
Difference between URL forwarding and re-routing?

I am curious what the difference is from an MVC .NET Framework perspective, if that makes any difference...

Thanks
0
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I tried to restrict SSH access to one of my Cisco Nexus 9508. Earlier I was permitting all RFC 1918 to SSH
and now it's limited to two bastions. BUT after modifying my ACL to have just two bastion hosts I am
still able to ssh to the 9508 at its management address from my desktop machine which shouldn't
be possible. What am I missing?

line vty
  exec-timeout 15
  access-class 5 in

core11-las# sho access-list 5

IP access list 5
        40 permit ip 10.132.17.27/32 any
        50 permit ip 10.183.57.250/32 any


core11-sf# sho users
NAME     LINE         TIME         IDLE          PID COMMENT
babadoo  pts/3        Feb 28 16:01   .          5121 (172.20.100.50) session=ssh *
1
HP 2930 switches use VSF for stacking. Documentation describes "chain" and "ring" configurations.  Is it possible to use VSF in a "star" configuration?
0
Reading BGP Routing table

In BGP Routing table displayed below, I would like to know the meaning of "i" .
there is "i" under Network column and another "i" under Path column.

Thank you

BGProuting.JPG
0
Can an application can choose which network adapter it wants to communicate with, and how would that be done?

I found the following on the Microsoft website:

Network List Manager
"The Network List Manager API enables applications to retrieve a list of available network connections. Applications can filter networks, based on attributes and signatures, and choose the networks best suited to their task."

Assume I have several network connections listed under "Control Panel\All Control Panel Items\Network Connections". Each network connection goes to it's own private LAN.

I would like to write a program which communicates with only one of my network adapters, instead of broadcasting my request to "The Network" in general.

And I would like another program to simultaneously communicate with only one different network adapter, and not "The Network" in general.

So I would like both network adapters to be working at the same time. But I don't want these two network adapters to be connected together -- I don't want any "networking" between these two adapters. In fact I would not like either network adapter to be connected to "The Network", because I cannot guarantee there will never be an IP Address Conflict between these two private LANs. In fact there is quite likely to be the same IP address found on each LAN. So I don't want to connect either of these network adapters together in any way.

The only three solutions I've come up with are:

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Hi, please help, i am confused regarding ip address.

I have /23 address and i am assuming that i should be able to use host on /24 on it.

for example

10.101.180.0/23

This is my confusion, i tried to add a host 10.101.181.24/24

Please advice is it wrong, and if wrong what range of ip address can i include in that /23.



Thanks for your help.
0
I need help with how to enter a IPHELPER address for a VLAN on my Cisco 9300 switch.  it is currently set to an address, and I want to change it.
0
Simple WAN - 3 sites, one main and two remote sites connected via a MetroE with Cisco routers.  IP address of cisco router is 192.168.1.253 at a particular site...

Each site has sonicwall to ISP internet.  For this example, sonicwall is 192.168.1.254.  DHCP is handled by sonicwall and default gateway for network is 192.168.1.254.  

Is there anyway to have the default gateway change automatically should the internet go down at a remote site.  For example, Internet goes out at the 1.x network.  If I manually change the default gateway to 1.253, then devices would use MetroE to access Internet at main site plus all other devices over the MetroE.

I need this to happen automatically.  I could make the internal MetroE cisco router as the default route but again, on the fly how would I route "unknown" traffic across the MetroE should the local Internet go down?

Thanks
0
Adtran NetVanta 1335 using a DB9 serial cable following the below procedures the router prompts for username and password.

Problem:  Acquired a used Adtran 3450 router and needed to configure it for a location that needed a router.   Problem was that I didn’t know the password for the web user, enable and the console user.   I needed to find a way to reset this router or change the password.

Solution:  To get into the router and bypass the passwords, you need to console into the router using a DB9 serial cable and a VT100 emulator like Putty or HyperTerminal.  When connected, pres ESC within the first 5 seconds of the unit powering on to get into bootstrap mode.  Once in bootstrap mode, type bypass passwords and press enter.  Then type boot and the unit will reboot, bypassing the need for passwords.

Reset Password:

At the # prompt type config terminal and press Enter.
At the (config)# prompt, type enable password password Where password is your new password.
At the (config)# prompt, type username youruser password yourpassword and click enter.  Of course yourmuser and Your password are the user and password that you choose.  This will create a new administrator user where you can login without going into bootstrap mode.
Type exit and the write mem to save the config.

Tried putty and hyperterminal get the same results.
0
I'm stuck I need to create a PAT for ASA Cisco 5505 ADSM 7.3  I can't remember how to do this.  I'm in a bind and need help.PAT
100.64.0.11 - Destination 67.199.244.193 & 67.199.245.193 - someone please help!
0
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EIGRP Equal Cost Load-Balancing

in the display below, I would like to know if R1 will reach network 4.4.4.4  in Load-balancing way.. I mean one packet will go out of fa0/0 and another fa0/1.
How is  load-balancing done in the equal cost ?

Thank you


R1#sh ip eigrp topology 
EIGRP-IPv4 Topology Table for AS(1)/ID(192.168.13.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status 

P 192.168.24.0/24, 1 successors, FD is 30720
        via 192.168.12.2 (30720/28160), FastEthernet0/0
P 192.168.34.0/24, 1 successors, FD is 30720
        via 192.168.13.3 (30720/28160), FastEthernet0/1
P 192.168.12.0/24, 1 successors, FD is 28160
        via Connected, FastEthernet0/0
[b]P 4.4.4.4/32, 2 successors, FD is 158720
        via 192.168.12.2 (158720/156160), FastEthernet0/0
        via 192.168.13.3 (158720/156160), FastEthernet0/1
[/b]

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0
i set up a network with 5 routers, a CE, a PE, a P, a PE, and a CE
between CE <-> PE i set up ebgp on both sides

i set up the ip vrf companyname vrf process and set route targets
i got the eBGP adjancies up and running .. got the vrf special interfaces configured on the PEs

and then i found out i addressed the route distinguisher and route target incorrectly, so, i deleted the vrf process (no ip vrf) in order to change the RD and RT, but it was too late
my bgp sessions came down

how do i get them back up
does everything haev to go in order?

can i clear ip bgp ( i already tried and nothing happened)

thanks
-dave.j
0
BGP Configuration to Receive Directly-Connected Routes

I am looking at BGP example from this Link: https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/23675-27.html

when it gets to this step : Configuration to Receive Directly-Connected Routes

It is not clear about what the step achieves.

Any Expert to explain  it with comments after each command ?

Thank you
0
Multiple Internet Connections to Multiple ISPs

when planning to have internet connections to Multiple ISPs, initially I thought it can be just as having Internet Connections at home, but you will have 2 routers connecting to 2 different providers , for instance Comcast and ATT.

I know in Work environment you need redundancy, if one ISP is not available  the other ISP should be.. or if one of Customer routers is not available , internet connection will be available through other Customer router...

-- In the diagram below, we have 2 company Sites :Site 1 and Site 2 connected between each other , either through WAN or Ethernet.

Site 1 is connected to ISP1 and Site 2 is connected to ISP 2

I would like to have a configuration example based on the diagram below , that will enable Site 1 and Site 2 to have always Network connection.
I know that BGP will be involved to accomplish this Goal.

I would like an expert to paste a configuration example with comments detailing what each line of the configuration is intended to achieve.

Thank you

internet.pdf
0
New client with Adtran router and the password they have on file doesn't work. I believe Adtran's can be accessed by a serial port however any advice how to access without a full reset is my question. Is it possible? It's not a hijacked situation the password was misplaced. Just bringing this up so this post does not go down the wrong path.

Question, is it possible to reset the password via the serial port and not take the router down. It's in production.
0
ROUTERS & SWITCH SPECS - I have a Linksys EA9500 router. I get 950 Mbps down and up to any device hooked to it. I have Ubiquiti  POE PRO 8 channel switch hooked to the router. On the input to the switch it says 10/100. Does that mean that the switch is only capable of maximum 100 Mbps? I think that is my problem since devices hooked to the switch are only showing 95 Mbps. Please set me straight.
0

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.