IPSec tunnels + NAT overload + NAT static
I have a setup with 1*1711 and 3*831. There is an IPSec tunnel between
each of the 831 (remote sites) and the 1711 (main site). NAT overload
is used for all the routers.
Remote sites access a Terminal Server on the main site on the standard
port 3389. This works well.
I want to have access also from the Internet to the Terminal Server on
the main site, but I want to use a different port number, let's say
port 7888 (and I don't want to use this port number for the PC that are
in the main or remote sites). Is this possible?
With my current configuration, as soon as I insert :
ip nat ...Simultaneous NAT overload (internet) and NAT overlapping for IPsec
Have been bashing my head against this for the last couple of days and
was wondering if anyone might be able to take a look at the config and
point where I might be approaching this wrong...
My current lab is configured as:
Two sites (SITE1/SITE2) connected via a third third router (ISP) -
There is a pure IPsec tunnel between SITE1 and SITE2. Both SITE1 and
SITE2 have overlapping IP addresses (SITE1 uses 10.1.1.0/24 and SITE2
uses 10.0.0.0/16 and 192.168.80.0/24 - however, we're only presented
with access to 10.81.0.0/18 via the IPsec VPN)
Okay... Overlapping NAT&...NAT Overloading
I have a question regarding PAT or NAT Overloading.
I understand how NAT overloading works with TCP and UDP which have the
notion of port numbers, but how does it work and does it work at all
with other protocols, like ICMP or IPIP or GRE ? For example, can I
have several PPTP tunnels from the inside network to a VPN server in
Thanks for any input.
Victor Sudakov, VAS4-RIPE, VAS47-RIPN
...Help! Static NAT failed to work -- NAT overload issue?
I set up Cisco 1811 with multiple static NAT like this
ip nat inside source static 10.10.10.13 xx.xx.xx.13
ip nat inside source static 10.10.10.11 xx.xx.xx.11
Once a while when after lot of downloading/uploading, I failed to
access all mapped machines except the router. And I have to reload the
router to recover the access. When I look at the router's NAT table
when it fails, there are hundred's entries like this (same external IP
downloading from the server inside the router)
10.10.10.11 : 80 xx.xx.xx.xx : 2049
10.10.10.11 : 80 xx.xx.xx.xx : 2050
10.10.10.11 : 80 ...NAT overload with some static NAT's and a block public IP's
Please review the config below :
ip address 192.168.1.254 255.255.255.0
ip nat inside
no cdp enable
dsl equipment-type CPE
dsl operating-mode GSHDSL symmetric annex B
dsl linerate AUTO
encapsulation aal5mux ppp dialer
dialer pool-member 10
ip address 184.108.40.206 255.255.255.248
ip nat outside
dialer pool 10
ppp authentication pap callin
ppp pap sent-username user password pass
ip route 0.0.0.0 0.0.0.0 Dialer10 permanent
ip nat translation tim...Cisco 1801 - ADSL/PPPoE - IPSec - Static NAT ---- 56K Dial Backup
I am looking for a little guidance on coming up with a configuration
for a very complicated situation. What I'm looking to do is to run a
PPPoE ADSL connection on a Cisco 1801. This 1801 will then need to do
an IPSec tunnel back to a Juniper ERX.
Also, I will need to do several Static NATs with one of the subnets
that will be tunneled. For example, the ethernet subnet of the Cisco
will be 192.168.100.254/24. I will then route 10.20.95.0/24 via the
IPSec tunnel and will need to create specific Static NAT's throughout
the subnet, such as 10.20.95.1 will equal 192.168.100.100.
The r...several nat overload
I want to have two nat overload
Gi 0/0 is internal interface with nat inside
Gi 0/0.5 is external with nat outside
There is rule:
ip nat inside source list 2 interface GigabitEthernet0/0.5 overload
If I try
ip nat inside source list 2 interface GigabitEthernet0/0.8 overload
%Dynamic mapping in use, cannot change
If I add
ip nat inside source list 3 interface GigabitEthernet0/0.8 overload
and add ip nat outside on Gi 0/0.8
then there is no translations in
sh ip nat translations
Is it possible to solve this problem?
"Dmitry Melekhov" <email@example.com> wrot...Direct connections through NAT/firewall
I'm involved with some research at the University of Manitoba (in Winnipeg,
Canada) this summer. My colleagues and I are in the process of developing a
method for reliably establishing direct connections over the Internet
between two hosts that are both behind NAT gateways.
The software we've come up with runs in userspace linux, so there is no
kernel or network stack tweaking required. It can easily be extended to
multiple operating systems.
No ports have to be explicitly opened at the firewall. And the method is
able to "break through" several kinds of NAT/firewalls...NAT Overload and load sharing
I have a Cisco 2650 with IOS 12.3 (c2600-i-mz.123-16.bin), a fast ethernet,
and 2 Int T1 CSU/DSU cards.
Verizon has just enabled the second T-1 line for constant operation--it was
previosly just a backup line.
Each T-1 is using frame relay on a serial sub-interface and has ip addresses
assigned-- using a /30 subnet.
The FA0/0 is defined as ip nat inside and the Serial Sub Interfaces are
designated as ip nat outside.
I was using" ip nat inside source list 10 interface s0/0.1 overload" to
allow internal users access to the Internet.
I can now use the
ip nat pool test netmask ...