Welcome to the Cisco Networking Professionals Ask the Expert conversation. This is an opportunity to discuss with Cisco expert Mak Chitale on how to troubleshoot access servers. Mak joined Cisco in May 1999 as a systems engineer in Mumbai, India before moving to the Technical Assistance Center - TAC in San Jose a few months later. His current responsibilities include escalations in which he troubleshoots complex issues, provides training, and authors documentation. His areas of expertise are configuration and troubleshooting of Access Servers, PPP, VPDN etc. Chitale is a CCIE # 7071 for ISP Dial. He is the world wide SME (Subject Matter Expert) for Access technology which involves improving the web documentation.
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in my office i do have 4 ip global ip addresses... i configured the cisoc 2651xm for pptp tunnel and i assigned one of the ip address to that pptp server and i tried to connect the same 2651XM with the help of onther ip address from that 4 ip addresses it dosent work... but if i tried from some where else like from other then my office it is allowing to establish the pptp tunneling so what will be the problem in this scenario...
all 4 ip address are having same subnet mask...
This can be the routing issue. Pl. let me have the topology that you have. Since you have a PPTP server behind the 2651XM, are you using the 2651XM as a router of those 4 global ip addresses?
Here is the web page which has some sample configs and troubleshooting links which may help for troubleshooting based on the topology.
Hi - we have just installed 3 of the Aironet 1200 series access points in our warehouse to support a group of RF barcode scanning devices. It seems that, for now, we have no problem with the RF guns communicating with the access points, but we do not seem to get any connection to the back-end network. The access points are wired as follows: From the network hub, we have a short piece of Cat5 cable running to a power injector (Cisco Aironet AIR-PWRINJ3). From the power injector, we have a long run of Cat5 cable running out into our warehouse to the Aironet 1200. When we eliminate the long cable run and use a short Cat5 cable run to the 1200, we can connect just fine to our back-end network and our application software. However, when we position the 1200 at the other end of the long cable runs, that back-end communication ends. Also, we can see the lights on the 1200, and all 3 lights flicker fast green when close connected, and that flickering slows way down (and sometimes one of the ligts flashes amber) when connected at the other end of the long run. We suspect the cable and have our electrician coming in to check it out, but wanted to know if there was a cable-length limitation on the Cat5 cables in this kind of setup, and if there is, is there some solution to the issue of our requiring some of the 1200's to be positioned far from the network hubs and servers? Please let me know. Thanks...
Ric LuBell (email@example.com)
i want to know the processing time required for the IPSec VPN. as we are trying to create the VPN to create the realtime data... so i want to know the time for encapsulation authentication etc....
in short IPSec VPN is good for realtime data or is there any other alternet way to do that...?
IPSEC VPN just provided the additional security for the data transfer. The timings for those should be fairly fast..in miliseconds...
If the data transfer is not that critical, you can use regular PPP and not the encryption for the data.
can you give me some good documentation link for VPDN and L2TP with IPSec for configuration on 26XX and 36XX routers...
Here is the link which has all that you are looking for.
I have a customer who is looking for a short-term RAS Dial-up solution that can use up to 2 PRIs. I've looked at the AS5350 and above, but they seem more geared towards a larger volume of calls, and a fairly high price for a short-term solution.
Which router platform can handle enough digital modems for two PRIs, and what WICs are needed to support them?
You can use ISR router 2801 for that job. You need NM-2CE1T1-PRI with PVDM-24DM for PRI and Digital modems.
Here is the link for more on that
I am always skeptic on whether a modem is specific for async and sync communication or it is required every where to change the freq to that of the service providers line.
Your question is not very clear to be. We could have a modem that can do sync/async, typically an async modem will be connected to a POTS line and async port on the router and a sync modem to a serial line.
No frequency issues need to be taken care of - or maybe I am not getting your question.
In general i want to know whether all the WAN technologies require an async or sync modem before entering in to the POTS or network cloud.
We have an AS5300 and two PRI's. Sometimes I connect as 44.5 bps, 16 bps, or 33 bps, etc? What caused the speed of the modem varies? Thanks.