topic Where to set clinet netmask in ASA, MSAD, split-tunnel, static IP from LDAP environment in Network Access Control

Where to set clinet netmask in ASA, MSAD, split-tunnel, static IP from LDAP environment

christian.kupferschmid — Mon, 11 Mar 2019 00:13:49 GMT

I'm having a problem to set the netmask für SVC (anyconnect) clients when using a static IP assignment from MSAD via LDAP.

The schemata within MS AD has no netmask attribute.

We assign a 10.x.x.x address in the MS AD Dial-Up tab.

This results in that the client uses 255.0.0.0 as the corresponding netmask which generates a dynamic route of 10.0.0.0/8 into the SVC tunnel.

In split-tunnel situation, this is not the desired result.

We need to set the clients netmask to 255.255.254.0 or even 255.255.255.255

How can this be done?

---

ldap attribute-map TCCustLDAPAttrMap
map-name msRADIUSFramedIPAddress IETF-Radius-Framed-IP-Address

aaa-server RADIUS_LDAP2 host 10.238.60.44
server-port 636
ldap-base-dn dc=rz,dc=tc,dc=corp
ldap-scope subtree
ldap-login-password *
ldap-login-dn CN=S_ASA_Auth2,ou=S_Group,DC=rz,DC=tc,DC=corp
ldap-over-ssl enable
server-type openldap
ldap-attribute-map TCCustLDAPAttrMap

crypto ca certificate map TCCertMap 20
subject-name attr ou eq ou_tc_sslvpn-1

webvpn
enable outside
default-idle-timeout 3600
svc image disk0:/anyconnect-win-2.2.0140-k9.pkg 1
svc enable
certificate-group-map TCCertMap 20 OU_TC_SSLVPN-1

group-policy OU_TC_SSLVPN-1-GrpPol internal
group-policy OU_TC_SSLVPN-1-GrpPol attributes
vpn-simultaneous-logins 500
vpn-idle-timeout none
vpn-filter value CustSslVpnAcl1
vpn-tunnel-protocol svc
ip-comp enable
split-tunnel-policy tunnelspecified
split-tunnel-network-list value ssl-vpn-acl
user-authentication-idle-timeout none
webvpn
svc keepalive 60
svc rekey method ssl
svc dpd-interval client none
svc dpd-interval gateway none
svc ask none default svc
customization value DfltCustomization

tunnel-group OU_TC_SSLVPN-1 type remote-access
tunnel-group OU_TC_SSLVPN-1 general-attributes
authorization-server-group RADIUS_LDAP2
default-group-policy OU_TC_SSLVPN-1-GrpPol
authorization-required
authorization-dn-attributes CN
tunnel-group OU_TC_SSLVPN-1 webvpn-attributes
authentication certificate
tunnel-group-map enable rules

Re: Where to set clinet netmask in ASA, MSAD, split-tunnel, stat

Michael Dombek — Fri, 02 Jul 2010 19:06:24 GMT

I've had this problem with the subnet mask assigning like you do, but found this thread and especialy this post

https://cisco-support.hosted.jivesoftware.com/message/3061163#3061163

and it worked for me

hope this helps you too

cheers michael

Re: Where to set clinet netmask in ASA, MSAD, split-tunnel, stat

christian.kupferschmid — Fri, 02 Jul 2010 19:19:22 GMT

Thanx a lot Michael.

Now I use

ldap attribute-map TCCustLDAPAttrMap
map-name msRADIUSCallbackNumber IETF-Radius-Framed-IP-Netmask
map-value msRADIUSCallbackNumber 23 4294966784
map-value msRADIUSCallbackNumber 32 4294967295

So I use the Callback Field on the dial-in Tab on the User Properties to enter the bit lengt of the mask and mapp it to IETF-Radius-Framed-IP-Netmask.

Seems to work fine.

Again, thanks for the answer.

regards, chris

Re: Where to set clinet netmask in ASA, MSAD, split-tunnel, stat

Michael Dombek — Fri, 02 Jul 2010 20:00:07 GMT

Happy to here that it worked for you too.

Please rate the original post from
fdouble08 and halijenn

cheers Michael