Manage an ASA 5505 via console port with 2511

Posted on 2009-07-03
Medium Priority
Last Modified: 2012-05-07
I have a 2511 router configured to connect with all of my devices successfully...except for the ASA 5505 firewall. When I try to access the firewall it opens a connection, I know this because it says it's open and can be verified with the 'sh sessions' command; but it seems to get stuck there without even getting to the authentication. The firewall and router work otherwise. I'm fairly new to this and I'd appreciate any help.
Current configuration:
version 12.0
service timestamps debug uptime
service timestamps log uptime
service password-encryption
hostname R1
username <username> privilege 15 password 7 <password>
ip subnet-zero
ip host R2 2001
ip host R3 2002
ip host R4 2003
ip host S1 2004
ip host S2 2005
ip host S3 2006
ip host F1 2007
interface Loopback0
 ip address
 no ip directed-broadcast
interface Ethernet0
 ip address
 no ip directed-broadcast
interface Serial0
 no ip address
 no ip directed-broadcast
ip classless
line con 0
 logging synchronous
 transport input none
line 1 16
 transport input telnet
line aux 0
 password 7 <password>
 login local
line vty 0 4
 password 7 <password>
 login local
ASA 5505
ASA Version 7.2(4)
hostname F1
enable password <password> encrypted
passwd <password> encrypted
interface Vlan1
 nameif inside
 security-level 100
 ip address
interface Vlan2
 nameif outside
 security-level 0
 ip address dhcp setroute
interface Ethernet0/0
 switchport access vlan 2
interface Ethernet0/1
interface Ethernet0/2
interface Ethernet0/3
interface Ethernet0/4
interface Ethernet0/5
interface Ethernet0/6
interface Ethernet0/7
ftp mode passive
dns domain-lookup inside
dns domain-lookup outside
dns server-group DefaultDNS
 name-server X.X.X.X
 name-server X.X.X.X
object-group icmp-type ICMP-INBOUND
 icmp-object echo-reply
 icmp-object unreachable
 icmp-object time-exceeded
object-group network GROUP
 network-object X.X.X.X
 network-object X.X.X.X
access-list INBOUND extended permit icmp any any object-group ICMP-INBOUND
access-list INBOUND extended permit ip object-group GROUP any
access-list INBOUND extended permit tcp host X.X.X.X any eq X
pager lines 24
logging enable
logging console notifications
logging buffered warnings
logging asdm notifications
mtu inside 1500
mtu outside 1500
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-524.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1
static (inside,outside) tcp interface X X.X.X.X X netmask
access-group INBOUND in interface outside
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
aaa authentication telnet console LOCAL
aaa authentication ssh console LOCAL
aaa authentication enable console LOCAL
aaa authentication serial console LOCAL
http server enable
http inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
telnet X.X.X.X inside
telnet X.X.X.X inside
telnet timeout 5
ssh X.X.X.X inside
ssh timeout 5
console timeout 15
dhcp-client client-id interface outside
dhcpd auto_config outside
username <username> password <password> encrypted privilege 15
class-map inspection_default
 match default-inspection-traffic
policy-map type inspect dns preset_dns_map
  message-length maximum 512
policy-map global_policy
 class inspection_default
  inspect dns preset_dns_map
  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
prompt hostname context
: end

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Question by:d_prime
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LVL 79

Accepted Solution

lrmoore earned 672 total points
ID: 24776939
There's nothing special or magic about the asa console port different from a router. Not sure why it wouldn't work just as you have it. Uses same baud rate and everything else that the other devices use.. unless you've changed them someplace.
LVL 28

Expert Comment

ID: 24776965
I don't think the ASA has a route to your router.

Router's address is, ASA's address is, and I don't see any route statements in the ASA configuration.
LVL 79

Expert Comment

ID: 24777021
No routing required. This is a simple reverse-telnet session on the 2511 to a serial aux port connected to the console port of the ASA
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Author Comment

ID: 24777059
I added an inside route to via gateway (since that's the only device connected directly from that net) with metric 1 as a 'just in case' and still no dice. When I connect directly via the console port with my PC using default settings everything works perfectly, and the cable is custom but it works - I've tried it with several other devices.
LVL 28

Assisted Solution

asavener earned 328 total points
ID: 24778249
Er... why bother with reverse telnet when you can just telnet from the 2511?

Author Comment

ID: 24780058

It would be easier to just go ahead and do that, since that does work. But, it seems like I should be able to get the reverse telnet working somehow, and i tend to learn more trying to 'fix' things than just circumventing the problem...on the other hand, there doesn't seem to be much more to do to 'fix' this problem.

i guess I'll leave this open for a bit longer to see if anybody is able to add anything - otherwise i'll have to consider it a lost cause :(

Author Comment

ID: 24780196
problem solved - the wonderful custom cable that I'd been using was the problem. I swapped it out with all my other connections to test it with other devices, again, but this time it wasn't working so well. Again, I tried a new cable for the ASA 5505 connection and that seemed to work. So, moral of the story is that I need to get a decent cable tester.

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