I am trying to permit a multicast video stream to operate over an alternative IP address (239.239.20.5) as per the requirement from one customer without changing the origin multicast IP that all other customers use (239.239.10.5).
In my LAB I have 3 Routers (see attached topology diagram), one is the multicast source, the other the multicast destination, and the one in the middle running PIM, and everything works fine. If however on the middle router (R2), I add either of the below lines or both I am unable to get the multicast to work with the translated IP. It does however continue to work with the original IP Address.
ip nat inside source static 239.239.20.5 239.239.10.5 extendable
ip nat outside source static 239.239.10.5 239.239.20.5 extendable
(with ip nat inside and ip nat outside on the interfaces)
My general question is, is something special required to make the cisco router NAT multicast IP Addresses?
Below is the configuration of the routers and the output of the multicast routing table on the 3 routers when I attempt the multicast traffic:
R1
interface Ethernet0/1
ip address 192.168.1.2 255.255.255.0
ip pim sparse-dense-mode
!
interface Loopback1
ip address 192.168.2.1 255.255.255.0
ip pim sparse-dense-mode
ip igmp join-group 239.239.20.5
!
router rip
version 2
network 192.168.0.0
network 192.168.1.0
network 192.168.2.0
no auto-summary
!
sh ip mroute
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report,
Z - Multicast Tunnel, z - MDT-data group sender,
Y - Joined MDT-data group, y - Sending to MDT-data group,
G - Received BGP C-Mroute, g - Sent BGP C-Mroute,
N - Received BGP Shared-Tree Prune, n - BGP C-Mroute suppressed,
Q - Received BGP S-A Route, q - Sent BGP S-A Route,
V - RD & Vector, v - Vector, p - PIM Joins on route,
x - VxLAN group
Outgoing interface flags: H - Hardware switched, A - Assert winner, p - PIM Join
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 239.239.20.5), 00:18:37/00:02:23, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Ethernet0/1, Forward/Sparse-Dense, 00:18:37/stopped
Loopback1, Forward/Sparse-Dense, 00:18:37/stopped
(*, 224.0.1.40), 00:18:37/00:02:23, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Ethernet0/1, Forward/Sparse-Dense, 00:18:37/stopped
Loopback1, Forward/Sparse-Dense, 00:18:37/stopped
R2
interface Ethernet0/0
ip address 192.168.0.2 255.255.255.0
ip pim sparse-dense-mode
ip nat outside
ip virtual-reassembly in
!
interface Ethernet0/1
ip address 192.168.1.1 255.255.255.0
ip pim sparse-dense-mode
ip nat inside
ip virtual-reassembly in
!
interface Loopback1
ip address 192.168.3.1 255.255.255.0
ip pim sparse-dense-mode
!
router rip
version 2
network 192.168.0.0
network 192.168.1.0
network 192.168.3.0
no auto-summary
!
sh ip mroute
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report,
Z - Multicast Tunnel, z - MDT-data group sender,
Y - Joined MDT-data group, y - Sending to MDT-data group,
G - Received BGP C-Mroute, g - Sent BGP C-Mroute,
N - Received BGP Shared-Tree Prune, n - BGP C-Mroute suppressed,
Q - Received BGP S-A Route, q - Sent BGP S-A Route,
V - RD & Vector, v - Vector, p - PIM Joins on route,
x - VxLAN group
Outgoing interface flags: H - Hardware switched, A - Assert winner, p - PIM Join
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 239.239.10.5), 00:00:04/stopped, RP 0.0.0.0, flags: D
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Ethernet0/1, Forward/Sparse-Dense, 00:00:04/stopped
Ethernet0/0, Forward/Sparse-Dense, 00:00:04/stopped
(192.168.4.1, 239.239.10.5), 00:00:04/00:02:54, flags: PT
Incoming interface: Ethernet0/0, RPF nbr 192.168.0.1
Outgoing interface list:
Ethernet0/1, Prune/Sparse-Dense, 00:00:04/00:02:54
(*, 224.0.1.40), 00:07:10/00:02:50, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Ethernet0/0, Forward/Sparse-Dense, 00:06:41/stopped
Ethernet0/1, Forward/Sparse-Dense, 00:06:41/stopped
Loopback1, Forward/Sparse-Dense, 00:07:10/stopped
R3
interface Ethernet0/0
ip address 192.168.0.1 255.255.255.0
ip pim sparse-dense-mode
!
interface Loopback1
ip address 192.168.4.1 255.255.255.0
ip pim sparse-dense-mode
!
router rip
version 2
network 192.168.0.0
network 192.168.1.0
network 192.168.4.0
no auto-summary
!
sh ip mroute
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report,
Z - Multicast Tunnel, z - MDT-data group sender,
Y - Joined MDT-data group, y - Sending to MDT-data group,
G - Received BGP C-Mroute, g - Sent BGP C-Mroute,
N - Received BGP Shared-Tree Prune, n - BGP C-Mroute suppressed,
Q - Received BGP S-A Route, q - Sent BGP S-A Route,
V - RD & Vector, v - Vector, p - PIM Joins on route,
x - VxLAN group
Outgoing interface flags: H - Hardware switched, A - Assert winner, p - PIM Join
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 239.239.10.5), 00:00:03/stopped, RP 0.0.0.0, flags: D
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Ethernet0/0, Forward/Sparse-Dense, 00:00:03/stopped
(192.168.4.1, 239.239.10.5), 00:00:03/00:02:56, flags: PT
Incoming interface: Loopback1, RPF nbr 0.0.0.0
Outgoing interface list:
Ethernet0/0, Prune/Sparse-Dense, 00:00:03/00:02:56
(*, 224.0.1.40), 00:18:58/00:02:01, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Ethernet0/0, Forward/Sparse-Dense, 00:18:29/stopped
Loopback1, Forward/Sparse-Dense, 00:18:58/stopped
TEST FROM R3
#ping 239.239.10.5 so lo1
(because of the static NAT I an hoping the 239.239.20.5 join group on R1 would reply. If I change the join group back to the original IP of 239.239.10.5 so there is no NAT, then the ping works fine)
