topic Re: Am I in over my head...... in Network Security

Am I in over my head......

toddyboman — Mon, 11 Mar 2019 18:43:56 GMT

I have read a ton of stuff on this forum....WOW....great work by everyone contributing...

My initial question is how should I go about learning/familiarizing myself on how to properly configure cisco products?

Here is what I want to do with what I have.

I have a one asa 5510 and three asa 5505. The goal is to have the asa 5510 at our main office then the 5505 at each remote office. Then establish a vpn connection to the server at the main office.

I HAVE ZERO cisco experience.....and only know the basics in network. So am I way in over my head or can make this happen????

So far I have bridged my isp provided modem to my asa 5510. On the asa 5510 I have established my outside and inside interfaces. But I have not been able to establish a simple internet connection thru the asa 5510.....

Any help and suggestions is greatly appreciated.

Thanks!

Re: Am I in over my head......

Jon Marshall — Thu, 23 Sep 2010 10:17:15 GMT

toddyboman wrote:

I have read a ton of stuff on this forum....WOW....great work by everyone contributing...

My initial question is how should I go about learning/familiarizing myself on how to properly configure cisco products?

Here is what I want to do with what I have.

I have a one asa 5510 and three asa 5505. The goal is to have the asa 5510 at our main office then the 5505 at each remote office. Then establish a vpn connection to the server at the main office.

I HAVE ZERO cisco experience.....and only know the basics in network. So am I way in over my head or can make this happen????

Any help and suggestions is greatly appreciated.

Thanks!

Well, there is a ton of documentation avaailable on the Cisco site especially for VPNs that give step by step config guides so we can point you to those when you want to setup the VPN.

But first we need to get your ASAs setup so you have internet access.

So a few questions -

1) can you post config of ASA 5510 and remove any sensitive info ie. public IP addresses etc.

2) how are you testing internet connectivity ie. what is the source IP and where is it in relation to the ASA and what is the destination IP and are you using ping or trying to connect to a web site etc.

3) From the ASA itself can you ping the ISP gateway

Jon

Re: Am I in over my head......

rmavila — Thu, 23 Sep 2010 13:01:09 GMT

Hi,

First to set up the internet connectivity :

Have you configured the nat rules and the route commands ?

Nat rules would like (assuming you are translating all the inside ip to the outside interface ip) :

ASA5510(config)# global (outside) 1 interface

ASA5510(config)# nat (inside) 1 0.0.0.0 0.0.0.0

Also you need to point the default gateway to the isp :

ASA5510(config)# route outside 0.0.0.0 0.0.0.0

Do tell me how it goes

Regards,

Rahul

Re: Am I in over my head......

toddyboman — Thu, 23 Sep 2010 16:06:20 GMT

Thank you both for a prompt reply!!

I would love to post my configurations.....

but its all gone......I had my inside/outside/mgmt/ nat and routes all set up last night.....

NO everything wasn't functioning properly but I had it all set.......now I log in this morning and its like I am logging in the first time.....The only interface I have is mgmt. What did I do wrong???

My set up is as follows...

internet............isp given modem.......asa5510........basic switch/hub.......all office pc.

server

I currently have been doing all my setup/configurations through the ASDM launcher. However I see almost everyone used the command line.......Why? How can I properly connect to the asa and use the command line features?

Thanks again.....

Re: Am I in over my head......

Jitendriya Athavale — Thu, 23 Sep 2010 16:37:02 GMT

here is the link to setup vpn ising asdm

since this is a new setup i would suggest setup the vpn using the wizard it will take you 1 to 2 mins to setup vpn on both ends

now regarding initial config for your asa box, here is a example config

this is for asa 5505

ExampleASA(config)# username example password example privilege 15
ExampleASA(config)#

ExampleASA(config)# interface vlan 1
ExampleASA(config-if)# ip address 192.168.1.1 255.255.255.0
ExampleASA(config-if)# nameif inside

ExampleASA(config)# interface vlan 2
ExampleASA(config-if)# ip address 212.115.192.x 255.255.255.248
ExampleASA(config-if)# nameif outside

ExampleASA(config-if)# exit
ExampleASA(config)# route outside 0.0.0.0 0.0.0.0 212.115.192.y

ExampleASA(config)# interface ethernet0/0
ExampleASA(config-if)# switchport access vlan 2
ExampleASA(config-if)# no shutdown

ExampleASA(config)# interface ethernet0/1
ExampleASA(config-if)# no shutdown

ExampleASA(config)# nat (inside) 10 192.168.1.0 255.255.255.0

ExampleASA(config)# global (outside) 10 interface

if you are getting ip via dhcp then instead of giving ip address on asa give the following command

ip address dhcp set route

for asa 5510 only thing that is different is that you will be entering the ip address commands on interface and not on vlans as they have L3 ports, for example

int e0/0

ip address x.x.x.x y.y.y.y

nameif inside

no shut

for asdm and ssh access

ExampleASA(config)# crypto key generate rsa modulus 1024

ExampleASA(config)# aaa authentication ssh console LOCAL

ExampleASA(config)# ssh 192.168.1.0 255.255.255.0 inside

ExampleASA(config)# http server enable

ExampleASA(config)# aaa authentication http console LOCAL
ExampleASA(config)# http 192.168.1.0 255.255.255.0 inside

Re: Am I in over my head......

Allen P Chen — Thu, 23 Sep 2010 17:34:56 GMT

Here is a sample LAN-to-LAN VPN configuration, which it seems is what you are trying to configure:

http://www.cisco.com/en/US/partner/products/ps6120/products_configuration_example09186a0080950890.shtml

To save your configuration, you have to issue the command "write memory" or "copy run start". This will save the configuration.

Hope this helps.

Re: Am I in over my head......

toddyboman — Tue, 28 Sep 2010 05:57:01 GMT

Thanks everyone for the replies......as always other "stuff" came up to fix so this was put aside for a few days.....

Here is was my current configs........Still no connection to the Internet......So what all am I missing....

Thanks!

asdm image disk0:/asdm-508.bin
no asdm history enable
: Saved
:
ASA Version 7.0(8)
!
hostname L
domain-name default.domain.invalid
enable password ml encrypted
passwd 2 encrypted
names
dns-guard
!
interface Ethernet0/0
nameif outside
security-level 0
ip address 111.111.111.11 255.255.255.252
!
interface Ethernet0/1
nameif inside
security-level 100
ip address 192.168.10.1 255.255.255.0
!
interface Ethernet0/2
shutdown
no nameif
no security-level
no ip address
!
interface Ethernet0/3
shutdown
no nameif
no security-level
no ip address
!
interface Management0/0
nameif management
security-level 100
ip address 192.168.1.5 255.255.255.0
management-only
!
ftp mode passive
pager lines 24
logging asdm informational
mtu management 1500
mtu outside 1500
mtu inside 1500
no failover
monitor-interface management
monitor-interface outside
monitor-interface inside
asdm image disk0:/asdm-508.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0
route outside 0.0.0.0 0.0.0.0 111.1111.111.11 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00
timeout mgcp-pat 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
username admin password vx8BkOWfWwvYuBKw encrypted
aaa authentication ssh console LOCAL
http server enable
http 192.168.1.0 255.255.255.0 management
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd address 192.168.1.6-192.168.1.254 management
dhcpd address 192.168.10.10-192.168.10.200 inside
dhcpd dns 200.200.200.10
dhcpd lease 3600
dhcpd ping_timeout 50
dhcpd enable management
dhcpd enable inside
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map global_policy
class inspection_default
inspect dns maximum-length 512
inspect ftp
inspect h323 h225
inspect h323 ras
inspect rsh
inspect rtsp
inspect esmtp
inspect sqlnet
inspect skinny
inspect sunrpc
inspect xdmcp
inspect sip
inspect netbios
inspect tftp
!
service-policy global_policy global
Cryptochecksum: e
: end

Re: Am I in over my head......

Jitendriya Athavale — Tue, 28 Sep 2010 06:14:24 GMT

firstly your default gateway is wrong

you have given it to be the same as your outside or external interface ip

route outside 0.0.0.0 0.0.0.0 111.1111.111.11

secondly how are you testing internet connetivity if you are doing a ping test to internet it will not work bcoz you are not inspoecting icmp

try to browse or add this

policy-map global_policy
class inspection_default

inspect icmp

and ping 4.2.2.2

Re: Am I in over my head......

Brian O'Flynn — Wed, 29 Sep 2010 08:55:03 GMT

Does your ISP require authentication to connect? Noticed you are bridging your DSL to your Firewall, so you probably need some PPOE config on your firewall:

http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a0080ab7ce9.shtml

Cheers

Brian

Re: Am I in over my head......

toddyboman — Wed, 29 Sep 2010 15:24:35 GMT

Brian -

I am confused and questioning my setup......

Do I have to bridge my router or not? Should I bridge it to make the asa connect to the internet......or can I just simple let my isp given modem acquire my internet connection and then connect my asa to that and allow all stuff to run through the asa?

Thanks for the help!

Re: Am I in over my head......

Jitendriya Athavale — Wed, 29 Sep 2010 15:37:00 GMT

you can do the second alternative, use the isp given modem and

connect asa behind it

but the point we r getting to is how is your isp router set, if it is bridge mode you might have to set it up a different way and similarly if you have it i router mode we would look at it from a different point of view

may be this is confusing

in any case, can you please check the default gateway as per my previous post

Re: Am I in over my head......

toddyboman — Wed, 29 Sep 2010 15:40:28 GMT

I can set the ips given modem either way......either bridge it or not.....Which way should I set it?

Won't the default gateway depends on which way I set the modem???

Thanks!

Re: Am I in over my head......

Jitendriya Athavale — Wed, 29 Sep 2010 15:49:51 GMT

well you are rihgt it does depend, but the default gateway cannot be your self in any case and it is set that way currently your default gateway is your ip itself

Re: Am I in over my head......

toddyboman — Wed, 29 Sep 2010 16:24:12 GMT

Sorry I am making this so challenging........I am learning a lot as I go.....So thanks so much for your time and help!!

ok.....if I don't bridge my isp router......and go into my ips router settings.....I can find:

network routing tables and host routing tables.....both providing different gateways....

Here is my latest config....

asdm image disk0:/asdm-508.bin
no asdm history enable
: Saved
:
ASA Version 7.0(8)
!
hostname L
domain-name default.domain.invalid
enable password m encrypted
passwd m encrypted
names
dns-guard
!
interface Ethernet0/0
nameif outside
security-level 0
ip address 111.111.111.11 255.255.255.252
!
interface Ethernet0/1
nameif inside
security-level 100
ip address 192.168.10.1 255.255.255.0
!
interface Ethernet0/2
shutdown
no nameif
no security-level
no ip address
!
interface Ethernet0/3
shutdown
no nameif
no security-level
no ip address
!
interface Management0/0
nameif management
security-level 100
ip address 192.168.1.5 255.255.255.0
management-only
!
ftp mode passive
pager lines 24
logging asdm informational
mtu management 1500
mtu outside 1500
mtu inside 1500
no failover
monitor-interface management
monitor-interface outside
monitor-interface inside
asdm image disk0:/asdm-508.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0
route outside 0.0.0.0 0.0.0.0 127.0.0.1 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00
timeout mgcp-pat 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
username 12 password v encrypted
aaa authentication ssh console LOCAL
http server enable
http 192.168.1.0 255.255.255.0 management
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd address 192.168.1.6-192.168.1.254 management
dhcpd address 192.168.10.10-192.168.10.200 inside
dhcpd dns 200.200.200.10
dhcpd lease 3600
dhcpd ping_timeout 50
dhcpd enable management
dhcpd enable inside
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map global_policy
class inspection_default
inspect dns maximum-length 512
inspect ftp
inspect h323 h225
inspect h323 ras
inspect rsh
inspect rtsp
inspect esmtp
inspect sqlnet
inspect skinny
inspect sunrpc
inspect xdmcp
inspect sip
inspect netbios
inspect tftp
inspect icmp
!
service-policy global_policy global
Cryptochecksum:f
: end

Thanks again!!

Re: Am I in over my head......

Jitendriya Athavale — Wed, 29 Sep 2010 16:31:10 GMT

no worries, even i learnt it by questioning, it

feels good when one tries to learn rather than just implement what one says

anyways coming back,

teh default gateway still looks incorrect because it looks like you have given the internal loopback ip address as default gateway

your default gateway would be the ip address of the interface on isp router which is connected to asa, if you are unsure you can conatct the isp guys and they will help you figure that out

also other option is see if you can configure it as pppoe server or dhcp server so that we can configure asa to get ip address and default gateway from the modem itself

Re: Am I in over my head......

toddyboman — Wed, 29 Sep 2010 16:52:49 GMT

sounds good....

So the default gateway for my isp router is 192.168.1.1. So this should be the default gateway i should input?

As for configuring dhcp or ppoe I would set this on the outside interface or configure a new interface?

Can I set up ppoe with my verison of asa......My asa version is 7.0(8).......I thought I read somewhere I could only do ppoe for 8.X????

Thanks again!

Re: Am I in over my head......

Jitendriya Athavale — Thu, 30 Sep 2010 00:21:07 GMT

since it is a new setup i would recommend you go to the atleast 8.x code, bcoz 7.08 is ancient

coming back to the default gateway question let m egive you an example

if this is your interface ip

asa55(config-if)# ip address 212.115.192.x 255.255.255.248
asa55(config-if)# nameif outside
INFO: Security level for "outside" set to 0 by default.

asa55(config-if)# exit

your default gateway would be the following (basically in the same subnet)

asa5505(config)# route outside 0.0.0.0 0.0.0.0 212.115.192.y

from what you have sent me it looks like your modem has an internal ip in 192.168.1.x range and it is doing natting

so you need to put an ip to the outside interface in the same subnet and give it as the default gateway

asa-----------------------------isp modem/router--------------------------

192.168.1.x 192.168.1.1 public ip

correct me if this setup is wrong

Re: Am I in over my head......

toddyboman — Thu, 30 Sep 2010 03:42:03 GMT

jathaval wrote:

since it is a new setup i would recommend you go to the atleast 8.x code, bcoz 7.08 is ancient

WHY did i not do this update earlier......WOW.

jathaval wrote:
coming back to the default gateway question let m egive you an example
if this is your interface ip

asa55(config-if)# ip address 212.115.192.x 255.255.255.248
asa55(config-if)# nameif outside
INFO: Security level for "outside" set to 0 by default.

asa55(config-if)# exit
your default gateway would be the following (basically in the same subnet)

asa5505(config)# route outside 0.0.0.0 0.0.0.0 212.115.192.y
from what you have sent me it looks like your modem has an internal ip in 192.168.1.x range and it is doing natting
so you need to put an ip to the outside interface in the same subnet and give it as the default gateway
asa-----------------------------isp modem/router--------------------------
       192.168.1.x          192.168.1.1                      public ip
correct me if this setup is wrong

YES my asa is 192.168.1.x

Yes my isp/modem/router is 192.168.1.1

Then my isp has provided me with 2 static ips......we will call them 111.111.111.111 and 222.222.222.222

WOW really missing the boat on this default gateway.......

BEFORE I started this project a simple ipconfig on any machine shows a default gateway of 192.168.1.1....which is the ip of my isp/modem/router......

My isp guys say that gateway is my first static ip.........so IF i configure my outside interface as a ppoe and make it obtain an IP using ppoe then will I make my gateway my first static ip (111.111.111.111).......

Re: Am I in over my head......

Jitendriya Athavale — Thu, 30 Sep 2010 03:49:50 GMT

if you configure your asa to get ip from pppoe you can also configure it such that it gets its default gateway from th eisp rputer

so we wont have to bother about default gateway as the modem is going to puch it

if you using static's ip's (which is the current setup), then change the default gateway to 192.168.1.1

and you should be up and running

also when you say you connect your PC to this mdem your PC gets an ip with defaukt gateway as 192.168.1.1, it gives me a feeling that your modem is behaving like a dhcp server

Re: Am I in over my head......

toddyboman — Thu, 30 Sep 2010 14:35:09 GMT

Thanks again for all your help.......

jathaval wrote:

also when you say you connect your PC to this mdem your PC gets an ip with defaukt gateway as 192.168.1.1, it gives me a feeling that your modem is behaving like a dhcp server

My modem does have a dhcp option.....should this be diabled?

here is my current config......with my router NOT bridged........giving my asa outside interface a static IP.......no PPOE configurations on my ASA.........

: Saved
:
ASA Version 8.0(5)
!
hostname L
domain-name default.domain.invalid
enable password m encrypted
passwd U encrypted
names
dns-guard
!
interface Ethernet0/0
nameif outside
security-level 0
ip address 111.111.111.111 255.255.255.252
!
interface Ethernet0/1
nameif inside
security-level 100
ip address 192.168.10.1 255.255.255.0
!
interface Ethernet0/2
shutdown
no nameif
no security-level
no ip address
!
interface Ethernet0/3
shutdown
no nameif
no security-level
no ip address
!
interface Management0/0
nameif management
security-level 100
ip address 192.168.1.5 255.255.255.0
management-only
!
ftp mode passive
clock timezone CST -6
clock summer-time CDT recurring
dns server-group DefaultDNS
domain-name default.domain.invalid
pager lines 24
logging asdm informational
mtu outside 1500
mtu inside 1500
mtu management 1500
no failover
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-631.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0
route outside 0.0.0.0 0.0.0.0 192.168.1.1 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
timeout tcp-proxy-reassembly 0:01:00
dynamic-access-policy-record DfltAccessPolicy
aaa authentication ssh console LOCAL
http server enable
http 192.168.1.0 255.255.255.0 management
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd dns 192.168.10.1
!
dhcpd address 192.168.10.5-192.168.10.25 inside
!
dhcpd address 192.168.1.6-192.168.1.10 management
dhcpd enable management
!
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
username admin password vx8BkOWfWwvYuBKw encrypted
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map type inspect dns migrated_dns_map_1
parameters
message-length maximum 512
policy-map global_policy
class inspection_default
inspect dns migrated_dns_map_1
inspect ftp
inspect h323 h225
inspect h323 ras
inspect rsh
inspect rtsp
inspect esmtp
inspect sqlnet
inspect skinny
inspect sunrpc
inspect xdmcp
inspect sip
inspect netbios
inspect tftp
inspect icmp
!
service-policy global_policy global
prompt hostname context
Cryptochecksum:6db9429f9cba9424fccd50647514ae9a
: end
asdm image disk0:/asdm-631.bin
no asdm history enable

According to the ARP table on the ASDM some of my office pc's where connected to the mgmt interface.....and not the inside interface. (Which I thought was odd?) ........but those pc's couldn't establish an internet connection.....