SNMP traffic not allowed on L2L VPN

[toy4two2]

I have an NMS in branch A that polls devices in branch B. The tunnel is up and I can ping across it, access the remote devices ASDM, even RDP into hosts at branch B.

But for whatever reason the ASA in branch A keeps denying the UDP port 161 traffic.

The default, out of the box ACLs are setup, with the addition of ICMP from outside to inside for testing.

Shouldn't all VPN traffic bypass ACLs becaues its on the tunnel, I shouldn't need ACLs to allow traffic from one side of the VPN to the other should I?

Log error message:

Deny inbound UDP from 192.168.200.228/1034 to 192.168.100.120/161 on interface outside

 

[unclerico]

we need to see scrubbed configs from both devices. make sure that the crypto acl on site a is a mirror opposite of site b

I hate all Uppercase... I don't want my groups to seem angry at me all the time! =)
- ColdFlame (vbscript forum)

 

[Supergrrover]

What is being polled? The remote ASA? Acls will block traffic under certain conditions.

Brent
Systems Engineer / Consultant
CCNP, CCSP

 

[toy4two2]

here are the configs:

ASA Version 8.2(1)
!
hostname branch1
enable password 8Ry2YjIyt7RRXU24 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
!
interface Vlan1
nameif inside
security-level 100
ip address 192.168.200.248 255.255.255.0
!
interface Vlan2
nameif outside
security-level 0
ip address <branch1 public ip here> 255.255.255.248
!
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
clock timezone PST -8
clock summer-time PDT recurring
access-list outside_access_in extended permit icmp any any echo-reply
access-list outside_1_cryptomap extended permit ip 192.168.200.0 255.255.255.0 192.168.100.0 255.255.255.0
access-list inside_nat0_outbound extended permit ip 192.168.200.0 255.255.255.0 192.168.100.0 255.255.255.0
pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
icmp unreachable rate-limit 1 burst-size 1
icmp permit any inside
icmp permit any outside
no asdm history enable
arp timeout 14400
global (outside) 10 interface
nat (inside) 0 access-list inside_nat0_outbound
nat (inside) 10 192.168.200.0 255.255.255.0
access-group outside_access_in in interface outside
route outside 0.0.0.0 0.0.0.0 <branch1 public gateway ip here> 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
aaa authentication http console LOCAL
http server enable
http 192.168.200.0 255.255.255.0 inside
http 192.168.100.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
crypto map outside_map 1 match address outside_1_cryptomap
crypto map outside_map 1 set pfs group1
crypto map outside_map 1 set peer <branch2 public ip here>
crypto map outside_map 1 set transform-set ESP-3DES-SHA
crypto map outside_map interface outside
crypto isakmp enable outside
crypto isakmp policy 10
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 86400
telnet timeout 5
ssh 192.168.200.0 255.255.255.0 inside
ssh 192.168.100.0 255.255.255.0 inside
ssh timeout 5
console timeout 0
management-access inside

threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
webvpn
username xxxx password xxxx
tunnel-group <branch2 public ip here> type ipsec-l2l
tunnel-group <branch2 public ip here> ipsec-attributes
pre-shared-key xxxx
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
parameters
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 netbios
inspect rsh
inspect rtsp
inspect skinny
inspect esmtp
inspect sqlnet
inspect sunrpc
inspect tftp
inspect sip
inspect xdmcp
!
service-policy global_policy global
prompt hostname context
Cryptochecksum:306d46bd1de19cc94128386d34ebbd47
: end


ASA Version 8.2(1)
!
hostname branch2
enable password 8Ry2YjIyt7RRXU24 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
!
interface Vlan1
nameif inside
security-level 100
ip address 192.168.100.248 255.255.255.0
!
interface Vlan2
nameif outside
security-level 0
ip address <branch2 public ip here> 255.255.255.252
!
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
access-list outside_access_in extended permit icmp any any
access-list outside_access_in extended permit udp any any eq tftp
access-list outside_1_cryptomap extended permit ip 192.168.100.0 255.255.255.0 192.168.200.0 255.255.255.0
access-list inside_nat0_outbound extended permit ip 192.168.100.0 255.255.255.0 192.168.200.0 255.255.255.0
pager lines 24
mtu inside 1500
mtu outside 1500
icmp unreachable rate-limit 1 burst-size 1
icmp permit any inside
icmp permit any outside
no asdm history enable
arp timeout 14400
global (outside) 10 interface
nat (inside) 0 access-list inside_nat0_outbound
nat (inside) 10 192.168.100.0 255.255.255.0
access-group outside_access_in in interface outside
route outside 0.0.0.0 0.0.0.0 <branch2 public gateway ip here> 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
aaa authentication http console LOCAL
http server enable
http 192.168.100.0 255.255.255.0 inside
http 192.168.200.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
crypto map outside_map 1 match address outside_1_cryptomap
crypto map outside_map 1 set pfs group1
crypto map outside_map 1 set peer <branch1 public ip here>
crypto map outside_map 1 set transform-set ESP-3DES-SHA
crypto map outside_map interface outside
crypto isakmp enable outside
crypto isakmp policy 10
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 86400
telnet timeout 5
ssh 192.168.100.0 255.255.255.0 inside
ssh 192.168.200.0 255.255.255.0 inside
ssh timeout 5
console timeout 0
management-access inside

threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
webvpn
username xxxx password xxxx encrypted privilege 15
tunnel-group <branch1 public ip here> type ipsec-l2l
tunnel-group <branch1 public ip here> ipsec-attributes
pre-shared-key xxxx
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
parameters
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 netbios
inspect rsh
inspect rtsp
inspect skinny
inspect esmtp
inspect sqlnet
inspect sunrpc
inspect tftp
inspect sip
inspect xdmcp
!
service-policy global_policy global
prompt hostname context
Cryptochecksum:982ba1f62e1d90b51331d4a98e59ab1b
: end

 

[toy4two2]

we are not polling the ASA's with SNMP, we are polling hosts at the branch office.

 

[toy4two2]

Here are screenshots of the firewall rules and debug blocks

 

[toy4two2]

here is the log

 

[toy4two2]

configs were fine. All along turned out to be a hub I didn't know about sitting between our data closet and my ASA. Must have been a duplex mismatch. Such an odd issue.