07-29-2013 10:05 AM - edited 03-04-2019 08:35 PM
Hello,
We are setting up DID SIP Trunk on the PBX server. In this regard we purchased a Cisco Router 880 series and direct line from ISP connected to there MPLS network.
Currently the PBX server is connected to our internal network and it is under vlan 50. The gateway of the server is pointing to switch.
Now we got DID SIP trunk, therefore our PBX server must be reachable to Provider SIP address.
I have configured router
int fastethernet 0
description " connection to ISP Modem
no ip address
switchport access vlan 1
int fastethernet 1
description " connection to LAN Switch
no ip address
switchport access vlan 2
int fastethernet 2
description " connection to Laptop
no ip address
switchport access vlan 2
int vlan 1
ip address 172.x.x.57
ip nat outside
ip virtual reassembly
int vlan 2
ip address 10.1.50.2 255.255.255.0
ip nat inside
ip virtual reassembly
ip route 0.0.0.0 0.0.0.0 172.x.x.58 ( ISP Address)
ip route 10.x.x.68 ( ISP SIP Address) 255.255.255.252 172.x.x.58 ( ( ISP Address)
access-list 110 permit ip 10.1.50.0 255.255.255.0 ( Internal PBX server subnet)
ip nat inside source list 110 “interface fasthernet 0 ” overload
Switch Configuration
int vlan 50
ip address 10.1.50.1 255.255.255.0
PBX server configuration
IP: 10.1.50.3 SM: 255.255.255.0 G/W: 10.1.50.1
My Problem:
- I connected a laptop directly to router ( int fastethernet 2) and assigned the required ip address and gateway pointing to router. But I cannot ping the ISP IP address ( 172.x.x.58) I can ping from router with no issues
- How I can route the traffic on the server to ISP IP Address ( 172.x.x.58) without changing gateway on the server. So it can reach to ISP address
I would highly appreciate any help
Thanks
07-29-2013 10:56 AM
Hi,
ip nat inside source list 110 “ interface fasthernet 0 ” overload
your NAT outside interface is vlan1 not f0 !
So change like this ip nat inside source list 110 interface vlan 1
this will only work for traffic intiated from nat inside interface destined to nat outside but not the other way
Regards
Alain
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07-29-2013 03:29 PM
I have configured the router and switch but still cannot ping from PBX server to ISP IP address
Even from the router I tried
ping 172.x.x.58 255.255.255.252 source vlan 2 not pinging
ping 172.x.x.58 255.255.255.252 source vlan 1 pinging
Router Configuration
ip address 172.X.X.57 255.255.255.252
ip nat outside
ip virtual-reassembly in
!
interface Vlan2
ip address 10.1.50.2 255.255.252.0
ip nat inside
ip virtual-reassembly in
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
ip nat source list 110 interface Vlan1 overload
ip route 0.0.0.0 0.0.0.0 172.x.x.58
!
access-list 110 permit ip 10.1.48.0 0.0.3.255 any
int vlan 50
ip address 10.1.50.1 255.255.252.0
ip route 172.x.x.56 255.255.255.252.0 10.1.50.2
PBX Server Config
IP: 10.1.50.4
SM: 255.255.252.0
G/W: 10.1.50.1 ( SWITCH IP)
Please any advise.
07-30-2013 03:03 AM
does the isp have a route back to 10.1.48.0/22 network cheers
07-30-2013 04:43 AM
hi Sameer,
As cadet alain said your NAT statement is not currect.
apply the command as like
Ip nat inside source list 110 interface vlan 1 overload
Thanks
Gajendra
07-30-2013 07:39 AM
I did that but still not working. I pulling my hairs now what wrong with this issue.
Thanks
07-30-2013 03:07 PM
I did this it solved
ip nat inside source list NAT interface Vlan 1 overload
!ip access-list extended NAT
permit ip 10.1.48.0 0.0.3.255 any
Now its pinging from router source vlan 2, from laptop, from PBX server.
But got a last issue
I am trying to ping ISP address from the PBX server I cannot but from the router I can ( source vlan 1 and vlan 2)
I added the route on our core switch
ip route 10.x.x.68 255.255.255.252 10.1.50.2
tracert output from server
C:\Users\Administrator>tracert 10.x.x.69
Tracing route to 10.x.x.69 over a maximum of 30 hops
1 <1 ms <1 ms <1 ms 10.1.48.1 ( Switch gateway)
2 * * * Request timed out.
3 * * * Request timed out.
4 * * * Request timed out.
07-31-2013 03:57 AM
Hi,
I simulated your topology in GNS 3 , its working properly . But I used router Instead PBX server and use physical intherface instead Vlan intherface.
I do not understand why you use VLAN in this Scenario .
Best Regard
Pedram
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