Cisco VPN :: ASA 5505 DHCP Request Incorrect Host Name Length
Jun 26, 2011
I have an ASA 5505 with software version 8.2(1). It is making DHCP requests for IPSec clients that connect to the ASA. The DHCP requests packets the ASA makes have an extra '00' appended to the hostname field, and the length field is the size of the hostname + 1. The DHCP server is Microsoft Server 2003 and this causes the hostname to be registered with an unknown character which appears as []hostname. Then when server 2003 tries to update the DNS record, it fails because of the invalid character in the hostname. Is there anyway to have the ASA have the correct length for the hostname field in the DHCP packet, or a workaround that will solve this problem?
View 5 Replies
ADVERTISEMENT
Mar 27, 2012
Wondering if on the ASA (8.4) its possible to do something like what DNS rewrite does, but with IP requests. Scenario. Mobile phone accesses a web app inside our network fine over cellular. Once it comes inside on to wifi it still has the public IP address cached so the ASA doesn't allow its request to loop around and the app appears broken. We're considering lowering the TTL on the DNS host entry but I think we are battling phones/mobile OS's that don't have a strict adherence to name resolution standards. A lot just seem to refresh their caches every 10-15 minutes.
View 4 Replies
View Related
May 13, 2012
Initially there were 3 SSIDs configured but all of them were assigned a single interface and this interface was configured with the controller management IP address as DHCP server so that the WLC could assign IP addresses to wireless clients, guns and printers etc.
Issue: As part of PCI initiative, we decided to segment the traffic in multiple subnets based on type of wireless clients; so now there are 3 interfaces configured and each SSID is assigned a specific dynamic interface and each interface is configured to use the controller management IP address as DHCP server.
There are 3 scopes configured for each of the dynamic interfaces/SSIDs and DHCP proxy is enabled but wirelss clients are still being allocated IP addresses from the original DHCP scope that was associated with the dynamic interface originally assigned to all 3 SSIDs.
I verified the following:
1. Each SSID is assigned a different dynamic interface (Users, Voice and Handhelds)
2. Each dynamic interface is configured to use controllers management IP address as DHCP server
3. DHCP scopes configured with correct network information for each dynamic interface and enabled
View 2 Replies
View Related
Jul 8, 2012
I am trying to setup VLANs and most of configurations are working ok now except IP address assignment from DHCP. If any computer in VLAN 120 or 130 configured with manual IP address, then all works fine. It can reach internal servers and the internet without problem.If the IP address is assigned automatically then any computer in VLAN 120 or 130 are obtaining IP address (strangely!) from VLAN 100. Because switch ports that connected to the computer belongs to VLAN 120 or 130, the computer cannot reach internal servers and the internet with ip address from VLAN 100 . All SVI interfaces for VLAN 100, 120 and 130 have ip helper-address option defined pointing to the DHCP server. No DHCP snooping enabled on all switches at this point. DHCP server have three scopes for the three different VLANs.
View 2 Replies
View Related
Dec 3, 2012
Region : France
Model : TD-W8968
Hardware Version : V1
Firmware Version : TD-W8968_V1_120926
ISP : SFR
Device in question: siemans C610 IP voip phone
Configuration:
* The C610 is directly connected to TD W8968 via the ethernet port number 3 >> ethernet port number 1 is connected to the devolo homeplug 200AVPLUS . The PC is at the other end of the homeplug network
* The DHCP address starts at 192.168.1.100 - 192.168.1.199.
Symptom:
1. It takes a long time (about 2-3 minutes) for the C610IP to obtain the IP address of 192.168.1.100 after the synchronisation of the ADSL line is finished 2. In the DHCP client list, I could only see the IP address of the PC (192.168.1.101) but not the C610 IP. However, if I type 192.168.1.100, I could access to the configuration page of the C610 IP. - I only managed to see the C610IP once in the DHCP client list.
I tried to unplug -> replug the router but to no avail.
View 2 Replies
View Related
Jan 18, 2013
I'm trying to relace my isp modem by a cisco 877 adsl router..
The internet part is already done is working fine... however... there is also an seperate pvc for the voice part.
The pvc is working with the MER protocol... the thing now is... when i'm trying to get an ip address by dhcp on the sub atm interface nothing happen..
I did an debug dhcp detail and see that the router is first sending correctly an dhcp discover,the isp is replying to this with an dhcp offer i see my ip address,subnet mask and gateway addresses however.. the router isn't replying anymore with an dhcp request... so nothing happens anymore..
View 1 Replies
View Related
Oct 15, 2011
I have reinstalled windows 7 on my Toshiba laptop, I have my wireless set to automatically connect, I have excellent signal strength and have another pc connected to wireless router, but my laptop does not capture IP addresses. I tried renew command but got message unabl to contact your DHCP server, request timmed out.
View 1 Replies
View Related
Dec 14, 2011
We have a Cisco Aironet 1130AG Wireless AP (firmware 12.4) and have a guest wireless network (internet only) and corporate wireless network configured on it. They are kept separate by having different VLANs assigned to them. When a laptop connects to the guest network I see the DHCP request go out and it is tagged with the correct VLAN. The problem is when a laptop connects to the corporate network I see the DHCP request go out but there is no VLAN tagged on the packets. This causes a problem because both of our DHCP servers (on VLAN 1 and 3, remote DHCP servers no DHCP running on the Aironet [Doesn't seem like this version has a DHCP server]) are sending responses and sometimes the corporate user will get an IP address on the Guest subnet.
Our corporate network is setup on VLAN 1 which is configured as the Native VLAN on the Aironet. Will this cause the Aironet not to tag these packets with any VLAN information? Any other thoughts as to why it isn’t tagging these packets to a VLAN?
View 3 Replies
View Related
Jul 3, 2011
I've been having problems connecting my laptop to the internet through wireless. When I plug it in with a cable it works fine. I also know my wireless works fine because i have other things attached to it. When I try to connect it says limited or no connectivity, but the signal strength is excellent. I have tried to repair the problem but it then tells me it cannot renew my ip address. I've also tried the ipconfig /release then renew, and thats when it says about my DHCP.
View 1 Replies
View Related
Feb 22, 2013
Version 12.2(33)SXI
int vlan 1
description client vlan
ip vrf forwarding A
ip address 10.1.1.1 255.255.255.0
standby 129 ip 10.1.1.2
standby 129 timers 1 4
standby 129 priority 105
standby 129 preempt
ip helper-address 10.1.2.20
[code]....
dhcp requests are not making it to the dhcp server SAME VRF (ip helper-addres is not doing anything.....)extended vrf traceroutes on udp 67 sourced from vlan2 are fine
I am expecting udp unicast packets on port 67 "giaddr" relay packets on the DHCP server generated and sourced by the relay on Vlan1
eg. Mar 1 01:59:06.731: DHCPD: setting giaddr to 10.1.1.1
This exact setup works in our preprod environment with the same code.Only difference is we run Distributed etherchannel on the 6500's where this doesnt work.
Wireshark on the client I can see the requests being sent Going to check it with debug ip dhcp server to check the relay logs out of production hours.
I have seen so many people say it IS and ISN'T supported on this version of the code.e.g. [URL]
I am aware the helper-adddress should inherit the vrf of the interface ip helper-address vrf command is not supported.The fact it works in the PP environment.... could this be due to the Distributed EtherChanel difference? or just some bug....
View 2 Replies
View Related
Jun 23, 2011
My ISP waits a definite host name from me to return my white IP address via DHCP. Can I set this parameter in RV220W router? I don't find such parameter in IPv4 WAN configuration page.
View 1 Replies
View Related
Dec 16, 2010
I am using a 1811W and CCP for configuration. I am trying to assign client names to devices on the LAN so that when a network scanner is used, the client name is displayed. I have attached part of the running config after a binding has been done. My assumption is that the scanner should now show 192.168.1.109 as name <Supermicro>, but the name is blank. Is this configured correctly for what I am trying to acheive?
View 3 Replies
View Related
Apr 26, 2011
I have an 1811 configured with dhcp scope and generally it works correctly. I have a host on the vlan/subnet that the scope is assigned that can receive an IP and all the specifics from the dhcp server. [code]
The host on the vlan/subnet should use the router as the dns server to resolve static hosts that are configured on the router itself. Can an IOS DHCP/DNS server do this?
View 1 Replies
View Related
Mar 22, 2011
I have 2 web servers that replicate between them (two different internal ip). My idea is that if one of them will not work, the other to do the relay.I have a Cisco ASA 5505 I can do a nat for each machine. How should I set ?
View 3 Replies
View Related
May 13, 2012
Based on the configuration pasted below, we believe the host (10.0.2.200 / 255.255.255.0 GW: 10.0.2.1 with external DNS servers configured) should have access to the web. However, it cannot resolve any names nor can it connect outside.
[code]....
View 19 Replies
View Related
May 20, 2011
I have a ASA 5505 Sec Plus. I would like to allow outside hosts to our mail server and also our FTP server. So i would like to allow only SMTP, HTTP (for Outlook Web Access) and FTP.
View 10 Replies
View Related
Feb 26, 2013
I updated an ASA 5505 to 50 users, but I still can only connect 10 hosts. In Licensing it show 50 insides hosts. I also tried to update to ASA 8.4.5 but that did not work.
View 2 Replies
View Related
Jul 8, 2012
Instead of using a IP address I would like to use a host address that points to a NTP pool.An example would be:ntp server 0.north-america.pool.ntp.org Can this be done on the ASA series?
View 1 Replies
View Related
Jun 12, 2011
I have created a RA VPN with a 5505 using Anyconnect client. My VPN functions perfectly, but now I am trying to limit access so that only one single host on my network can connect. To do this I tried creating an ACL permiting the host and denying all other traffic, but it does not work it seems every one can connect. how I can limit the outside access to a single host?
View 3 Replies
View Related
Apr 22, 2012
I'm using an ASA5505 (8.4(1)) and would like to block port 80 on a specific host in the LAN so machines in other remote LANs connected via VPN can't access this port on the host. Devices in the local LAN should have access to this port on the host. Here are the commands I'm using:
-access-list block_port extended deny tcp any host 10.20.10.20 eq 80
-access-list block_port extended permit ip any any
-access-group block_port out interface inside
These commands are not working as I would expect them to. When I browse to http://10.20.10.20 from a remote machine over the VPN tunnel I am able to access the host web server.
View 2 Replies
View Related
Mar 3, 2013
I ran into a very interesting problem that occurred today and I'm trying to figure out why it happened. If it was one ASA 5505 that just required the reboot, then I'd have just chalked it up to a glitch, but when we built a new AD/ DNS server on the main network at the main site and changed the 3 Remote site ASAs to point to the new DNS server in the DHCPD options, none of them could ping any local host names to the DNS server at the main site they were now pointing too, but external host names { URL} all translated and pinged fine.
From a laptop on one of the remote sites, we could ping the new AD/DNS server(192.168.0.3) and the old AD/DNS server(192.168.0.2) and everything else at the main site, and telnet to port 53 showed successful across the Easy VPN from the Remote site to the new server at the main site. When wire shark was added to the new DNS server at the main site, the DNS request and replies for {URL}, for example, came and worked fine, but any requests for local resources never made it to the server from the remote sites.
A reboot of one of the Remote Site ASA's corrected the issue. Then I rebooted the other two remote site ASAs, and now DNS was working fine for everybody. I had also tried clearing the ARP cache on the ASAs before resorting to rebooting them. I also tried rebooting the laptop thinking the local DNS cache needed cleared before resorting to rebooting the ASAs. I'm struggling to understand why external, public host names made it through and resolved from the remote sites to the new server at the main site, but anything local failed before even reaching the new server(The new DNS server could resolve requests made by computers at the main site, but the remote sites that traverse the Easy VPN from the ASAs failed). The new AD/DNS server is the only server configured for DNS for all remote site computers.
Is any of this making sense? I'm wondering if clearing the x late or local host tables would have corrected it without having to reboot. I'm just trying to grasp the understanding here and figure out what happened.
View 5 Replies
View Related
Jan 17, 2013
we have a cisco ASA 5505 and are trying to get the following working:
vpn client (ip 192.168.75.5) - connected to Cisco ASA 5505
the client gets a specific route for an internet address (79.143.218.35 255.255.255.255 192.168.75.1 192.168.75.5 100) when i try to access the url from the client i get a syn sent with netstat when i try the packet tracer from the ASA i see the following:
<Phase>
<id>1</id>
<type>FLOW-LOOKUP</type>
<subtype></subtype>
<result>ALLOW</result>
[code].....
View 5 Replies
View Related
Jun 27, 2011
I have a host that can successfully connect to a PIX 515E (7.x OS) via VPN Client; however, I have no IP routing to the LAN from the remote host.The VPN IP pool works finem,The LAN default gateway is the inside interface on the PIX; the network is flat L2 behind it.The default route on the PIX points out; no other routes are defined,The VPN remote host can be pinged from LAN hosts, but the VPN remote host cannot ping any LAN host, not even the PIX inside interface.
View 2 Replies
View Related
May 7, 2012
ASA 5510
Ver 8.2(5)
I have been looking all over the place for the answer of how to allow clients on an IPSEC VPN to ping from host to host.
View 4 Replies
View Related
Feb 10, 2011
I'm just wondering if its possible to ping an IPv4 host using the IPv6 host assuming that the NAT64 has already been implemented?
[code]...
View 2 Replies
View Related
Feb 21, 2010
I have an ASA 5505 configured to get a DHCP'd IP address from the ISP on it's outside interface. The problem I am seeing is when the ISP renews their IP address, the ASA 5505 is still holding on to the old IP address information. I have to either manually renew the IP or reload the ASA. I have the potential of rolling out hundreds of these devices and I would not like my customers to have to reboot their ASA everytime the ISP's DHCP lease experies. I am using an easy vpn autoconnecting to an ASA 5520. Static IP's are not an option on the outside interface of the ASA 5505's.
View 8 Replies
View Related
May 10, 2012
I'm using an ASA5505 with dhcpd.but i want to assign a specific IP address from the configured dhcp range to a specific PC.Is it possible to bind a specific ip to this particular PC's MAC address.
View 1 Replies
View Related
Apr 14, 2013
I've got a 5505 and I'm getting a DHCP address from a cable modem. How can I show the DNS that the ASA is getting? show int vlan 2 is only givving me the IP and net mask.
View 2 Replies
View Related
May 13, 2012
We recently upgraded our 5505s to 8.2(5) 26 and noticed that each will crash after a cerntain amount of time. Some crash every 30 minutes other will crash every 4 to 8 hrs. The only difference would be the user's home ISP and/or home router, if they have one. They are configured with a dynamic dhcp IP address for the outside interface and the crash files starts with the following:When we downgrade back to 8.2(5) 13 the problem goes away. Any known bugs for this version? I haven't been able to find anything yet. We do have one 5505 that does not have this issues. The only thing that may be different is that it was never at 8.2(5) 13. We had downgrade it from a 8.3 version.
View 2 Replies
View Related
Apr 1, 2012
I'm running a 5505 with DHCP on the outside interface. All 5505 are connecting to 5545.Can I configure the ASA for a site to site to automactically discover the the peer address and automatically establish a connection with 5545?In other words can I configure all settings for the site to site except the peer address. Once connected on network and get outside DHCP, can it also put that address is the peer section of site to site?
View 1 Replies
View Related
May 17, 2013
Well its in this line but do i have to type in a ip even if comcast is giving me a dhcp address?
route outside 0.0.0.0 0.0.0.0 any 1
=============================
hostname asa1
domain-name mydomain.com
enable password rwt5UQJihEq2/Qae encrypted
names
!
interface Vlan1
[code].....
View 4 Replies
View Related
Dec 4, 2011
I am opening a small branch office in another state and the equipment we purchased is as follows:
ASA5505
3560G.
We'll use a site to site vpn but just in case there's connectivity issues I'd like to use the ASA as DHCP. So far I have a scope defined in the ASA and if I plug a laptop directly in I get an applicable IP address. I trunked the port on the switch that goes to the ASA but not the one on the ASA itself (license restriction) The VLAN that I'm using for my PC's has an ip helper address that is assigned to the inside IP of the ASA.
View 5 Replies
View Related
Nov 21, 2011
I've been running a cisco asa 5505 for quite some time and it has been running fine, now all of a sudden it starts to renew it's outside dhcp adress like every 2 hours. I dont think it's the ISP since I have another device connected also using dhcp to the same ISP and it doesnt renew itself, it's just the ASA. Rebooting it, makes it pick up an adress straight away. The interface seems to be up, the GUI just reports "no ip adress" and then the ASA get's a new IP after about 10-15 min without one. Pressing the renew IP adress button in the GUI throws an error.
View 10 Replies
View Related
