topic Re: Problem with routing catalyst 3750 in Switching

Problem with routing catalyst 3750

ComputerArt — Wed, 06 Mar 2019 21:35:13 GMT

Switch#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)#interface Vlan2
Switch(config-if)#ip address 10.1.2.1 255.255.255.0
Switch(config-if)#no shutdown

Switch(config)#interface FastEthernet 0/1
Switch(config-if)#no switchport
Switch(config-if)#ip address 200.1.1.1 255.255.255.0
Switch(config-if)#no shutdown

Switch(config)#ip route 0.0.0.0 0.0.0.0 200.1.1.2

The ip 20.1.1.2 is not pingabile.

How can I ping 20.1.1.2 and a possible DNS server with ip 20.1.1.10?

Re: Problem with routing catalyst 3750

louis.tenga — Mon, 18 Oct 2010 20:24:36 GMT

The ip 20.1.1.2 is not pingabile.

How can I ping 20.1.1.2 and a possible DNS server with ip 20.1.1.10?

That IP address is not part of any of the above networks? That would be handled by your default route.

I tried pinging that address and I get no response.

Did you mean that 200.1.1.2 is not pingable?

Re: Problem with routing catalyst 3750

Leo Laohoo — Mon, 18 Oct 2010 21:12:53 GMT

Is "ip routing" enabled?

Re: Problem with routing catalyst 3750

Jon Marshall — Mon, 18 Oct 2010 21:22:08 GMT

In addition to Leo's suggestion does the default router in your diagrma have routes back to the vlans on your 3750 switch. If not you either need to run a routing protocol between the 3750 and the default router or add static routes to the default router eg.

ip route 10.1.2.0 255.255.255.0 200.1.1.1

etc. for each vlan

in addition how is your default router exchanhing routes with the corporate network ??

Jon

Re: Problem with routing catalyst 3750

glen.grant — Mon, 18 Oct 2010 21:30:31 GMT

Jon beat me to it but he is correct unless you have statics pointing back to your 3550 the net router has no idea what to do with those packets because you are not running a dynamic routing protocol.

Re: Problem with routing catalyst 3750

ComputerArt — Tue, 19 Oct 2010 07:54:55 GMT

I can ping the 20.1.1.1 can not ping the rest of the network 20.1.1.x.
I can also surf the internet.
I need access to DNS servers on the network 20.1.1.x.

Re: Problem with routing catalyst 3750

ComputerArt — Tue, 19 Oct 2010 08:13:27 GMT

Sorry I made a mistake, that's the right image

Switch(config)#interface FastEthernet 0/1
Switch(config-if)#no switchport
Switch(config-if)#ip address 20.1.1.1 255.255.255.0
Switch(config-if)#no shutdown

I need to see the network 20.1.1.x

Re: Problem with routing catalyst 3750

louis.tenga — Tue, 19 Oct 2010 13:20:25 GMT

Do a show ip route on the 3550 and the default router.

Make sure that the default router has routes to the 10.1.2.0, 10.1.3.0 and 10.1.10.0 networks.

Try pinging from the default router to hosts on those networks?

Are there any ACL's that could be blocking?

Re: Problem with routing catalyst 3750

ComputerArt — Tue, 19 Oct 2010 14:50:34 GMT

Sorry, I did a bit of confusion.
Here is the scheme of my network with the configuration of 3750.

Building configuration...

Current configuration : 1419 bytes
!
version 12.2
service config
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Switch
!
!
no aaa new-model
switch 1 provision ws-c3750-24ts
system mtu routing 1500
ip subnet-zero
ip routing
!
!
!
!
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
interface FastEthernet1/0/1
!
.
.
.
.
!
interface FastEthernet1/0/24
no switchport
ip address 10.10.10.80 255.255.255.0
!
interface GigabitEthernet1/0/1
!
interface GigabitEthernet1/0/2
!
interface Vlan1
ip address 192.168.0.1 255.255.255.0
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.10.10.138
ip http server
!
!
control-plane
!
!
line con 0
line vty 5 15
!
end

Switch#sh ip route
Codes: 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

Gateway of last resort is 10.10.10.138 to network 0.0.0.0

     10.0.0.0/24 is subnetted, 1 subnets
C       10.10.10.0 is directly connected, FastEthernet1/0/24
C    192.168.0.0/24 is directly connected, Vlan1
S*   0.0.0.0/0 [1/0] via 10.10.10.138

I did not create or modify ACL

So I can ping the 192.168.0.1, 10.10.10.80 and I can go on the Internet.

I can not ping the 10.10.10.138, 10.10.10.1, and the network 10.10.10.x

Thanks for your help and sorry for the confusion

Re: Problem with routing catalyst 3750

Jon Marshall — Tue, 19 Oct 2010 14:58:27 GMT

So I can ping the 192.168.0.1, 10.10.10.80 and I can go on the Internet.

I can not ping the 10.10.10.138, 10.10.10.1, and the network 10.10.10.x

Thanks for your help and sorry for the confusion

Ping it from where ie. a client in the 192.168.1.x network/the switch or the router ???

The unmanaged switch - what device is it ie. make and model ??

Jon

Re: Problem with routing catalyst 3750

louis.tenga — Tue, 19 Oct 2010 15:07:16 GMT

Claudio,

It sounds to me like the router at 10.10.10.138 does not have a route back to 192.168.0.0/24.

Can you verify with a 'show ip route' on 10.10.10.138 ?

It does not appear you are running any routing protocols or have a static route setup.

Re: Problem with routing catalyst 3750

ComputerArt — Tue, 19 Oct 2010 15:15:58 GMT

Ping from the switch 3750 all 10.10.10.xe 192.168.0.x
From pc "192.168.0.10" ping to 192.168.0.11 192.168.0.1, 10.10.10.80 and www.google.it.
From Pc "192.168.0.10" not ping the 10.10.10.1 and 10.10.10.2 and 10.10.10.138 network 10.10.10.x

The routing is not the case with the network 10.10.10.x except for 10.10.10.80.
The switch is a simple Linksys 16-port.

Re: Problem with routing catalyst 3750

ComputerArt — Tue, 19 Oct 2010 15:18:09 GMT

10.10.10.138 is the router Pirelli Telecom-Italy can not access.

Re: Problem with routing catalyst 3750

louis.tenga — Tue, 19 Oct 2010 17:17:24 GMT

Ok so without knowing the ipconfig on the PC's at 10.10.10.0/24 I can assume they are using 10.10.10.138 as their default gateway. Router 10.10.10.138 does not know how to get to 192.168.0.0/24 so whats happening is the ping from the 192.168.0.0 computers are going to the 10.10.10.0 pc's but they are responding to 10.10.10.138 since 192.168.0.0 is not on their network.

You might have to NAT the 192 network since you cannot access the Router to add routes.

Re: Problem with routing catalyst 3750

ComputerArt — Tue, 19 Oct 2010 17:28:30 GMT

Because if I replace a 3750 router to work?

How do the NAT 192?

Re: Problem with routing catalyst 3750

Jon Marshall — Tue, 19 Oct 2010 17:35:27 GMT

louis.tenga wrote:

You might have to NAT the 192 network since you cannot access the Router to add routes.

Louis

That the confusing part though. If the default router doesn't have path back to the 192.168.0.0 computers then how do the 192.168.0.0 computers access the internet ?? Unless i am misunderstanding what the OP has said.

Jon

Re: Problem with routing catalyst 3750

ComputerArt — Tue, 19 Oct 2010 17:55:02 GMT

I can also ping the public 85.20.2.xx.
I can not pigare class 10.10.10.0

Re: Problem with routing catalyst 3750

Jon Marshall — Tue, 19 Oct 2010 17:58:46 GMT

ComputerArt wrote:
I can also ping the public 85.20.2.xx.
I can not pigare class 10.10.10.0

Without seeing the router config we can't really help.

As Louis said if you could NAT the 192.168.x.x network that would be a solution but the 3750 doesn't support NAT so you can't do it.

Edit - it really depends on what you are trying to achieve. If you simply want to be able to contact the 10.10.10.x hosts then if you have access to them you could try changing the default-gateway to the 10.10.10.x address on the 3750.

Jon

Re: Problem with routing catalyst 3750

akhbinda — Tue, 19 Oct 2010 18:00:34 GMT

Hello Claudio,

As of now from troubleshooting perspective since, we do not have access to the public router :

- Can you share results ping results from the 3750 switch to the router (10.10.10.138) using (1) source ip as 192.168.0.x network..(2) source ip as 10.10.10.x network..??

- may be use debug command(if possible) to see the packets or probably put a sniffer like wireshark on a machine and capture packets which will give packet details.For this you can configure local span on 3750 switch and span traffic bidirectionally to and fro for the port connecting to the unmanaged switch from this.

- how about pinging a 192.168.0.x machine from 10.10.10.x machine..can u ping..??

- please share traceroute results from 192.168.0.x machine to 10.10.10.138(router) and 10.10.10.x machine..

Regards

/Akhil

Re: Problem with routing catalyst 3750

ComputerArt — Tue, 19 Oct 2010 18:15:48 GMT

from 192.168.0.10

C:\Users\Utente>tracert www.google.it instradamento verso www.l.google.com [72.14.234.104]
su un massimo di 30 punti di passaggio:

Traccia

1    <1 ms    <1 ms    <1 ms 192.168.0.1
2     1 ms     1 ms     1 ms 10.10.10.138
3     2 ms     2 ms     2 ms 10.0.0.254
4    85 ms    84 ms    86 ms 78-7-239-29-static.albacom.net [78.7.239.29]
5    82 ms    84 ms    84 ms 85-20-255-1-static.albacom.net [85.20.255.1]
6    86 ms    83 ms    84 ms 217.220.187.145
7    92 ms    93 ms   200 ms mno-b1-link.telia.net [213.248.89.97]
8   722 ms   125 ms   136 ms ffm-bb1-link.telia.net [80.91.249.38]
9   108 ms   108 ms   107 ms ffm-b7-link.telia.net [80.91.249.105]
10   826 ms   102 ms   103 ms google-ic-127675-ffm-b7.c.telia.net [213.248.89.
42]
11   102 ms   111 ms   102 ms 209.85.255.176
12   116 ms   116 ms   116 ms 209.85.251.112
13   111 ms   111 ms   111 ms 72.14.232.63
14   120 ms   111 ms   113 ms mil01s07-in-f104.1e100.net [72.14.234.104]

Traccia completata.

C:\Users\Utente>tracert 10.0.0.254

Traccia instradamento verso 10.0.0.254 su un massimo di 30 punti di passaggio

1    <1 ms    <1 ms    <1 ms 192.168.0.1
2     1 ms     1 ms     1 ms 10.10.10.138
3     4 ms     3 ms     2 ms 10.0.0.254

Traccia completata.

C:\Users\Utente>tracert 10.10.10.1

Traccia instradamento verso 10.10.10.1 su un massimo di 30 punti di passaggio

1     2 ms    <1 ms    <1 ms 192.168.0.1
2     *        *        *     Richiesta scaduta.
3     *        *        *     Richiesta scaduta.
4     *     ^C

My ipconfig

Scheda Ethernet Connessione alla rete locale (LAN):

   Suffisso DNS specifico per connessione:
   Descrizione . . . . . . . . . . . . . : Atheros AR8132 PCI-E Fast Ethernet Co
ntroller
   Indirizzo fisico. . . . . . . . . . . : 20-CF-30-1F-CC-2B
   DHCP abilitato. . . . . . . . . . . . : No
   Configurazione automatica abilitata   : Sì
   Indirizzo IPv6 locale rispetto al collegamento . : fe80::d098:534e:77a6:8e7c%
12(Preferenziale)
   Indirizzo IPv4. . . . . . . . . . . . : 192.168.0.10(Preferenziale)
   Subnet mask . . . . . . . . . . . . . : 255.255.255.0
   Gateway predefinito . . . . . . . . . : 192.168.0.1
   IAID DHCPv6 . . . . . . . . . . . : 354471728
   DUID Client DHCPv6. . . . . . . . : 00-01-00-01-14-35-E8-D1-74-F0-6D-1F-8D-A4

Server DNS . . . . . . . . . . . . . : 212.216.112.112
NetBIOS su TCP/IP . . . . . . . . . . : Attivato

topic Re: Problem with routing catalyst 3750 in Switching

Problem with routing catalyst 3750

Re: Problem with routing catalyst 3750

Re: Problem with routing catalyst 3750

Re: Problem with routing catalyst 3750

Re: Problem with routing catalyst 3750

Re: Problem with routing catalyst 3750

Re: Problem with routing catalyst 3750

Re: Problem with routing catalyst 3750

Re: Problem with routing catalyst 3750

Re: Problem with routing catalyst 3750

Re: Problem with routing catalyst 3750

Re: Problem with routing catalyst 3750

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Re: Problem with routing catalyst 3750

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Re: Problem with routing catalyst 3750