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devices not able to connect to network

HUGH LANCASTER
Beginner
Beginner

Cisco 3750 swtiches. Core switch has ip routing enabled.

I have a couple of sorenson VRS devices that cannot connect to the network. At first I thought it was a dhcp issue. I gave it a static IP address and still no go. Thinking it was port security issue, I disabled port security on the switch completed a shutdown interface and no shutdown command. Still no go. From the same port, I can connect a laptop and a ip address is assigned. No issues. Any suggestions would be appreciated. Thanks

34 Replies 34

Hi

Once the VRS devices are connected to the switchport, do you see the interface UP UP? When you set up the IP manually, are you able to ping the VRS device from the switch?




>> Marcar como útil o contestado, si la respuesta resolvió la duda, esto ayuda a futuras consultas de otros miembros de la comunidad. <<

It show up

For example 

If you set up the IP manually on the device and then try a ping, example

IP device
192.168.10.10 255.255.255.0

SWITCH

vlan 10

int fa1/0/15
description VRS-DEVICE
switchport access vlan 10
switchport mode access.

interface vlan 10
ip add 192.168.10.1 255.255.255.0

ping 192.168.10.10  or  ping 192.168.10.10  source vlan 10  

 do you receive an response?




>> Marcar como útil o contestado, si la respuesta resolvió la duda, esto ayuda a futuras consultas de otros miembros de la comunidad. <<

It is currently in VLAN 1. I have gave it a static address  10.100.0.86. and still no go. On the same port, I can connect laptop, assign same ip address, connect to internet and ping from another device I cannot ping the VRS device whether static are dhcp assigned.

Also, I tried it from vlan 20. Get dhcp address 10.100.24.12 Ping fails.. I connect laptop which get dhcp address  10.100.24.12 and pings successfully

Makes no sense.

Am I correct in understanding the initial post that VRS was not able to get an IP address using DHCP and in the most recent post that VRS is now successful in get an IP address using DHCP? Did something change?

In reading this post it seems that the main test of whether VRS is working is to try to ping it from another device on the network. It makes me wonder whether VRS has some security policy that does not allow ping.

HTH

Rick

HTH

Rick

It gets a DHCP IP Address; however, ping fails.

mmm from the gateway is possible to make a ping to the devices with the obtained IP? This VRS devices has any internal firewall or settings to restrict?




>> Marcar como útil o contestado, si la respuesta resolvió la duda, esto ayuda a futuras consultas de otros miembros de la comunidad. <<

Not a lot of options on the VRS device. No firewall. It allows you to set a static address or DHCP. I have ruled out dhcp issue, because static does not work. I have other devices and I can ping them. Thinking somehow my switch is blocking, my helper took one home and same issue. The company tech guy brought two to test and same issue. 

Am I correct in understanding that the VRS devices do get an IP address using DHCP? 

So far the only test that I see being described is to try to ping the VRS devices. I would suggest a different approach to testing. I would suggest first that we check and verify that VRS does respond to arp requests. So try to ping the VRS from the device where its default gateway is. Then check the arp table of that device and see if there is an entry for the address of the VRS. If there is no entry then turn on debug for arp and try the ping again. Post debug output so we can see the arp request and any other messages related to this.

HTH

Rick

HTH

Rick

On the 3750 switch, which debug arp command do I use. I see snooping and subblocking

I do not believe that either snooping or subblocking is what you want. I do not have access to a 3750 to check it at this point. Is there an option for debug ip arp on 3750? If not then try just debug arp <carriage_return>

HTH

Rick

HTH

Rick

debug ip arp | track | IP ARP track

I do not think that track is what we want. So I would try

debug arp <carriage return>

HTH

Rick

HTH

Rick

Log Buffer (4096 bytes):
P ARP: rcvd req src 10.100.1.81 a0d3.c12e.34e9, dst 10.100.1.238 Vlan1
122777: 50w5d: IP ARP: ignored gratuitous arp src 10.100.1.81 a0d3.c12e.34e9, dst 10.100.1.238 0013.c390.e2c0, interface Vlan1
122778: 50w5d: IP ARP: rcvd req src 10.100.0.21 000a00000000b, dst 10.100.0.18 Vlan1
122779: 50w5d: IP ARP: rcvd req src 10.100.0.21 000a00000000b, dst 10.100.0.41 Vlan1
122780: 50w5d: IP ARP: rcvd req src 10.100.0.21 000a00000000b, dst 10.100.0.45 Vlan1
122781: 50w5d: IP ARP: rcvd req src 10.100.0.21 000a00000000b, dst 10.100.0.54 Vlan1
122782: 50w5d: IP ARP: rcvd req src 10.100.0.21 000a00000000b, dst 10.100.0.55 Vlan1
122783: 50w5d: IP ARP: rcvd req src 10.100.0.21 000a00000000b, dst 10.100.0.80 Vlan1
122784: 50w5d: IP ARP: rcvd req src 10.100.0.21 000a00000000b, dst 10.100.1.75 Vlan1
122785: 50w5d: IP ARP: rcvd req src 10.100.1.81 a0d3.c12e.34e9, dst 10.100.1.238 Vlan1
122786: 50w5d: IP ARP: ignored gratuitous arp src 10.100.1.81 a0d3.c12e.34e9, dst 10.100.1.238 0013.c390.e2c0, interface Vlan1
0.100.5.15 Vlan1
122829: 50w5d: IP ARP: rcvd req src 10.100.0.15 000a00000000a, dst 10.100.5.16 Vlan1
122830: 50w5d: IP ARP: rcvd req src 10.100.0.15 000a00000000a, dst 10.100.5.18 Vlan1
122831: 50w5d: IP ARP: rcvd req src 10.100.0.15 000a00000000a, dst 10.100.5.19 Vlan1
122832: 50w5d: IP ARP: rcvd req src 10.100.0.15 000a00000000a, dst 10.100.5.20 Vlan1
122833: 50w5d: IP ARP: rcvd req src 10.100.0.15 000a00000000a, dst 10.100.5.21 Vlan1
122834: 50w5d: IP ARP: rcvd req src 10.100.0.15 000a00000000a, dst 10.100.5.25 Vlan1
122835: 50w5d: IP ARP: rcvd req src 10.100.0.15 000a00000000a, dst 10.100.5.26 Vlan1
122836: 50w5d: IP ARP: rcvd req src 10.100.0.15 000a00000000a, dst 10.100.5.3 Vlan1
122837: 50w5d: IP ARP: rcvd req src 10.100.0.15 000a00000000a, dst 10.100.5.31 Vlan1
122838: 50w5d: IP ARP: rcvd req src 10.100.0.15 000a00000000a, dst 10.100.5.39 Vlan1
122839: 50w5d: IP ARP: rcvd req src 10.100.0.15 000a00000000a, dst 10.100.5.5 Vlan1
122840: 50w5d: IP ARP: rcvd req src 10.100.0.15 000a00000000a, dst 10.100.5.6 Vlan1
122841: 50w5d: IP ARP: rcvd req src 10.100.0.15 000a00000000a, dst 10.100.5.7 Vlan1
122842: 50w5d: IP ARP: rcvd req src 10.100.1.35 bc9f.ef6d.ccba, dst 10.100.0.1 Vlan1
122843: 50w5d: IP ARP: ignored gratuitous arp src 10.100.1.35 bc9f.ef6d.ccba, dst 10.100.0.1 0000.a271.0000 , interface Vlan1
122844: 50w5d: IP ARP: rcvd req src 10.100.1.138 f8bc.12a1.386f, dst 10.100.1.212 Vlan1
122845: 50w5d: IP ARP: ignored gratuitous arp src 10.100.1.138 f8bc.12a1.386f, dst 10.100.1.212 0013.c390.e2c0, interface Vlan1
122846: 50w5d: IP ARP: rcvd rep src 10.100.0.211 0023.04eb.9858, dst 10.100.0.211 Vlan1
122847: 50w5d: IP ARP: ignored gratuitous arp src 10.100.0.211 0023.04eb.9858, dst 10.100.0.211 0013.c390.e2c0, interface Vlan1
122848: 50w5d: IP ARP: rcvd req src 10.100.0.224 e09d.3184.8048, dst 10.100.0.4 Vlan1
122849: 50w5d: IP ARP: ignored gratuitous arp src 10.100.0.224 e09d.3184.8048, dst 10.100.0.4 cb1d.a271.0000 , interface Vlan1
122850: 50w5d: IP ARP: rcvd req src 10.100.1.35 bc9f.ef6d.ccba, dst 10.100.0.4 Vlan1.7896, dst 10.100.0.21 Vlan1
122808: 50w5d: IP ARP: ignored gratuitous arp src 10.100.0.219 cc44.63f1.7896, dst 10.100.0.21 000a00000000b, interface Vlan1
q src 10.100.1.138 f8bc.12a1.386f, dst 10.100.1.212 Vlan1
122853: 50w5d: IP ARP: ignored gratuitous arp src 10.100.1.138 f8bc.12a1.386f, dst 10.100.1.212 0013.c390.e2c0, interface Vlan1
122854: 50w5d: IP ARP: rcvd req src 10.100.1.35 bc9f.ef6d.ccba, dst 10.100.0.4 Vlan1
122855: 50w5d: IP ARP: ignored gratuitous arp src 10.100.1.35 bc9f.ef6d.ccba, dst 10.100.0.4 cb1d.a271.0000 , interface Vlan1
122856: 50w5d: IP ARP: rcvd req src 10.100.0.21 000a00000000b, dst 10.100.1.80 Vlan1w5d: IP ARP: rcvd req src 10.100.0.15 000a00000000a, dst 10.100.0.219 Vlan1
122815: 50w5d: IP ARP: rcvd req src 10.100.0.219 cc44.63f1.7896, dst 10.100.0.15 Vlan1
122816: 50w5d: IP ARP: ignored gratuitous arp src 10.100.0.219 cc44.63f1.7896, dst 10.100.0.15 000a00000000a, interface Vlan1
122817: 50w5d: IP ARP: rcvd req src 10.100.0.16 0000.5d01.5cab, dst 10.100.1.41 Vlan1
Woodard3750#sh arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  10.100.0.119            0   6400.6a6a.f328  ARPA   Vlan1
Internet  10.100.1.66             0   Incomplete      ARPA
Internet  10.100.0.15             0   000a00000000a  ARPA   Vlan1
Internet  10.100.0.4              0   cb1d.a271.0000 ARPA   Vlan1
Internet  10.100.0.5              00000c390.0000 ARPA   Vlan1
Internet  10.100.0.3              0    000a00000000c ARPA   Vlan1
Internet  10.100.0.1              0   000a00000000d ARPA   Vlan1
Internet  10.100.0.21             0   000a00000000b  ARPA   Vlan1
Woodard3750#sh arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface

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