Cisco Firewall :: ASA 5505 Lose Internet Connectivity A Couple Of Times Per Hour
Oct 18, 2012
I have a problem with an internet connection with a customer.They have a Zyxel 660 in bridge mode and the public ip is delivered to the eth0/0 outside interface of a 5505 ASA.They lose internet connectivity a couple of times per hour. What solves the problem immediately is disconnecting the ethernet cable from the eth0/0 and then directly plugging it back. Then it runs for 20-30 minutes or so.The isp doesnt't notice any errors on the dsl connection, only that they cannot ping the outside interface from time to time (duhhh)However, yesterday, when problem appeared for first time , I noticed that this Zyxel was very hot since it was placed on top of the ASA. Now it is set apart.In the meantime I already replaced all cables, but I think it's the Zyxel so I urged that the ISP send a new Zyxel.Though it sounds strange. [code]
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Dec 3, 2012
i lose internet connectivity constantly although i still have WLAN connectivity. my connection is lost every 5 to 20 minutes. it dropped my connection in the middle of an A+ exam troubleshooter is useless. sometimes it says DNS unavailable. sometimes it say default gateway unavailable. but when i run ipconfig, DNS and Gateway fields look fine. it's happened when connected to my wireless cable modem (Ubee brand) the wireless hotspot on my mobile phone (an HTC myTouch) and now on my Clear Wireless portable wifi hotspot (Apollo model)[code]
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Jun 2, 2011
I have basically started fresh, from a clean image. We bought these with the expectation that we would be able to configure them using the GUI for what we need, which up till this point doesn’t seem to be the case.I will tell you how I have this setup, I have our ADSL going to a modem acting as a bridge with a static IP supplied by the ISP. If i connect a laptop to that modem and set the static ip on the laptop, I get internet access fine.So I then connect the modem to ethernet0/0 and the laptop to ethernet 0/1 I connect to the ASDM and run the startup wizard with the following:
· Outside ip : 87.87.87.87 255.255.252.0 (this works on the lappy straight to the modem)
· Inside ip : 192.168.10.1 255.255.255.0
· No dmz
[code]......
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Aug 9, 2012
I recently bought an ASA on eBay the plan was to try and learn how to configure them and get more familar with Cisco's ASA hardware etc.
I want it to do the routing for my home network. The way things are setup at the moment is pretty standard. I have an ADSL modem which is also a router which was provided by my ISP (Orange).
The first thing I did was change the router to be in "modem only" mode which seems to have worked. I then got the ASA to use PPPOE by following this guide [URL] I assume that worked as it is authenticating with the ISP and I'm getting a puplic IP address assigned to the outside interface. The default gateway is being set by the "ip address pppoe set route" command which I have verified with the "show route" command. The problem I'm having is that even though I'm getting a public IP I can't ping any thing from the ASA I've pinged 8.8.8.8 and 4.4.4.2 using the outside interface as the source but I'm not getting any responce. I have tried changing the MTU a few times to different amounts on the outside interface with no luck.
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Nov 4, 2012
I have an RV220W running firmware 1.0.4.17. I have a couple of wireless laptop users that connect to the wireless without problems, but frequently cannot access the Internet. They can always access local network resources, but for some reason when laptops are first powered up or are idle for a prolonged period of time, Internet access is lost. Wired clients never experience this problem and always maintain local network and Internet connectivity.
To get the laptops to access the Internet over wireless, we have to run a TRACERT command from the command prompt to a public IP address, and then all Internet access is restored.
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Nov 20, 2010
I just bought WRT54GH router. I have one PC (running Ubuntu) connected via Wireless.Every 5-10 minutes I get disconnected for a short period of time (about 10-30 seconds). During that period I am able to access router configuration page, but can't connect to the "outer" world... Surely it's not about my Internet provider, since connecting the PC directly to the Internet cable works fine with no "disconnections".
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May 26, 2012
I have a Linksys X2000 modem. Why does my internet go down several times a day? My provider is Century Link and I have already called them. They say all is well on their end, so it must be my modem. I reset and sometimes it pops right back and other times it takes an hour or more.
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Nov 8, 2011
I have a problem with a ASA 5505. He is crashing multiple times during the day. I've setup a syslog server en I'd noticed that the last two log notification were:
2011-11-08 12:28:19 Local4.Debug 10.0.0.254 %ASA-7-711002: Task ran for 27016 msec, Process = Dispatch Unit, PC = 84745ce, Traceback =
2011-11-08 12:28:19 Local4.Debug 10.0.0.254 %ASA-7-711002: Task ran for 27016 msec, Process = Dispatch Unit, PC = 84745ce, Traceback = 0x084745CE 0x08474942 0x08475511 0x08475DB7 0x08475EDA 0x08508D9B 0x0850908A 0x083AB5B8 0x083A1D55 0x080655C1 0x08895A19 0x08895AD0 0x08952194 0x08978450
It's a 5505 with a 10 user inside host license, wich incidentally is more.
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Sep 19, 2012
I have an issue with my current network where every couple of hours I will lose my connectivity and it will not come back unless I do a power cycle on my router/modem. I originally thought the issue was with my router, however I'm beginning to think it's an issue involving the modem. I've tried two different routers and this happens on both. My main router is a D-Link WBR-1310 (crap I know but it was free) and has lasted for years, and my modem is a Toshiba PCX2500 from Time Warner Cable. The second router I used to test this was an older Linksys BEFW11S4. I was going to replace my router, but when I saw that both of them reset after a few hours (today was only 5, last night it was connected for over 8 hours as I slept). I ran an IPCONFIG /ALL when I was connected with internet and when I was connected without and the only three changes were: [code]
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Aug 8, 2011
Why does my acer laptop lose connectivity?
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Dec 29, 2012
Network running about 60 computers, most of which are running windows 7 professional. Some are on a domain, some are not.At (seemingly) random times, some computer on the network will lose the ability to browse websites (including the web interfaces of networked devices). I can't identify what circumstances cause this to occur. I only find out about it when someone calls me.From the affected computer:I can ping sites I can ping our Cyberoam UTM (which acts as our DNS, DHCP, and firewall)disabling/enabling connection doesn't fix the problem releasing/renewing ip doesn't fix the problem flushing dns doesnt fix the problem uninstalled antivirus on two test machines, problem still randomly manifests.replaced the Cyberoam with newer model users have claimed that if they wait a long period of time (40+ minutes) the problem sometimes resolves.rebooting the computer resolves the issue until it randomly occurs again changing the computer's mac address also resolves the issue until it randomly occurs again.
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Mar 20, 2012
Aironet 1142, two units, using WPA Radius to IAS on Windows 2003. I have a problem with Macs beginning to surface. One laptop, OSX 10.6, ran fine for a couple of weeks. A problem started occurring, while using the network, communication will stop. The Mac still shows connected on the laptop, and it shows associated in the interface on the Airnonet. However, there is no data transfer. I open a terminal and ping, there is no response. After sitting for awhile trying to ping, it will start again and communicate. After letting the laptop sit for awhile, the same things happens. The connection can be disconnected and reconnected on the laptop to restore connectivity. I did a round of things on the Mac to eliminate problems in configuration there. The same thing happens with both Aironets. Today, the when the problem occured, a user with an iPhone experienced the same thing. This was a first for that iPhone. Another Mac laptop, a newer model, did not experience the problem.
As I am writing this, a user with an iPad now just emailed that he is having trouble connecting. We just recently upgraded this customer to Aironets and disconnected a conglomerate of other products. The last one to be disconnected was a low cost Trendnet, that this iPad user was previously connecting to with no problem. The other device he would have been using in a different area was a Mac Airport WAP.
On the Aironets, I have CCX turned off, have set speed settings to default.
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Mar 21, 2012
I am running those modules in my Cisco 6500 chassis and having lot of connectivity issues. I lose network connectivity every 5-6 day at around the same time. I have (2) C7000 Chassis with HP VC-Flex 10 Modules connected via 20Gb LAB to each Cisco Cisco 6513 Switches. However, the OA Modules on C7000 are connected via 1Gb uplink to either 6548 and 6148 modules. I beleive this is causing the netwok connectivity issues.What modules would be recommended to replace 6548 and 6148 who only meant to be used for 1Gb desktop connectivity, and not for Server Farm.
When you use either the WS-X6548-GE-TX or WS-X6148-GE-TX modules, there is a possibility that individual port utilization can lead to connectivity problems or packet loss on the surrounding interfaces. Especially when you use EtherChannel and Remote Switched Port Analyzer (RSPAN) in these line cards, you can potentially see the slow response due to packet loss. These line cards are oversubscription cards that are designed to extend gigabit to the desktop and might not be ideal for server farm connectivity. On these modules there is a single 1-Gigabit Ethernet uplink from the port ASIC that supports eight ports. These cards share a 1 Mb buffer between a group of ports (1-8, 9-16, 17-24, 25-32, 33-40, and 41-48) since each block of eight ports is 8:1 oversubscribed. The aggregate throughput of each block of eight ports cannot exceed 1 Gbps. Table 4 in the Cisco Catalyst 6500 Series 10/100- & 10/100/1000-Mbps Ethernet Interface Modules shows the different types of Ethernet interface modules and the supported buffer size per port.Over subscription happens due to multiple ports combined into a single Pinnacle ASIC. The Pinnacle ASIC is a direct memory access (DMA) engine that transfers packets between back plane switching bus and the network ports. If any port in this range receives or transmits traffic at a rate that exceeds its bandwidth or utilizes a large amount of buffers to handle bursts of traffic, the other ports in the same range can potentially experience packet loss. The buffer assignment on these modules is documented in Buffers, Queues & Thresholds on Catalyst 6500 Ethernet Modules.A SPAN destination is a very common cause since it is not uncommon to copy traffic from an entire VLAN or multiple ports to a single interface. On a card with individual interface buffers, the packets that exceed the bandwidth of the destination port are silently dropped and no other ports are affected. With a shared buffer, this causes connectivity problems for the other ports on this range. In most scenarios, shared buffers do not result in any problems. Even with eight gigabit attached workstations, it is rare that the provided bandwidth is exceeded.
The switch can experience degradation in services when you configure local SPAN in a switch, especially if it monitors a large amount of source ports.
This problem remains if it monitors certain VLANs and if a large number or ports is assigned to any of these VLANs.Even though SPAN is done in hardware, there is a performance impact since now the switch carries twice as much traffic. Since each linecard replicates the traffic at ingress, whenever a port is monitored, all ingress traffic is doubled when it hits the fabric. The capture of traffic from a large number of busy ports on a linecard can fill up the fabric connection, especially with the WS-6548-GE-TX cards, which only have an 8 Gigabit fabric connection.The WS-X6548-GE-TX, WS-X6548V-GE-TX, WS-X6148-GE-TX, and WS-X6148V-GE-TX modules have a limitation with EtherChannel. For EtherChannel, the data from all links in a bundle goes to the port ASIC, even though the data is destined for another link. This data consumes bandwidth in the 1-Gigabit Ethernet link. For these modules, the sum total of all data on an EtherChannel cannot exceed 1 Gigabit.
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Sep 16, 2011
At my office we have a simple network using a Netgear WGR614 V7 router. 4 XP machines are connected via Ethernet cable and three other people are connected wirelessly (one XP laptop, one Win7 laptop and one Win 7 netbook). It appears that whenever the netbook is on the network, the other two laptops lose connectivity. The wired machines are fine. Power cycling the router and rebooting usually solves the problem.
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Nov 7, 2012
I had a previous issue in which I couldn't make a connection to an ASA 5505 behind an edge firewall found here: url...My continuing issue is that I can indeed connect to the ASA 5505 remotely but I cannot access anything internally. I believe it is a NAT issue but as of yet, nothing has worked.
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Jan 24, 2012
Just bought a WRT400N and set it up using 5ghz and 2.4ghz bands, and using WPA TKIP for both. Problem is that both my laptop and my iphone occasionally lose connectivity and my iPhone says that my WPA key isn't valid.
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Jun 22, 2011
How can we host 300+ secure (https) websites using a couple of public IP's on an ASA5520 with AIP SSM-20 and with as few certificates as possible?
Summary of set-up:
We currently host a number of websites using an ASA5520 and use host headers, so have 6 servers with around 40 hosted URL's. The number of websites is due to double very soon and we will need to use more of our public IP's. We can see that we will will run out of public IP's very soon especially as there is a project in the pipeline that has a likely requirement to host an additional 200+ websites.
Each of these websites are required to use https and therefore each must have a certificate which will be very expensive. PCI DSS (payment card industry data security standard) is causing us issues because we had hoped to post the certificates on the firewall (one for each physical server) and then run the data UN-encrypted from the firewall to the relevant web servers, so that we could use one certificate for lots of websites and therefore reduce our certificate costs, however is not best practice to do this due to the data being unencrypted within the firewall and on the DMZ network and therefore potentially open to compromise. I doubt that we could install 200+ certificates on a 5520 and then re-encrypt the data to the web servers especially seeing as we also have an IPS card that is already running at around 70-80% util due to the performance overhead.
BTW - We also have an in-line Breach WAF which will be required to inspect the packets (certificates to be installed on the WAF to allow this).
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Nov 28, 2011
If I ping a NAT'ed IP address configured on an ASA 5505, is it handled at the firewall (as far as priority) as if I were pinging the firewall interface itself, or the end device? The reason I ask is I am seeing waves of ping latency that I can relate to data transfers, but the nothing is even close to being maxed out as far as CPU, memory, or bandwidth. My guess is this is being handled by the ASA in software instead of in hardware.
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May 1, 2011
I am connected directly to my modem. My isp is Verizon fios. my internet randomly freezes for a couple of seconds sometimes. mostly when im in game and on ventrilo i notice it. any idea why its really frustrating when im in game cuz i freeze and come back dead.
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May 7, 2011
I just have recently been experiencing some dropping off the internet.. My phone company has been out here and has done tests, and changed out my wireless modem with a new one, switched me to a new high speed port.. cleaned up the cables outside my house.. installed a new jack.. and we have yet to solve this intermittent dropping and reconnecting... I am starting to wonder, if not anything else with my outside line.. is there something else causing the problem. I switched my channel from 11 to 9.. *my neighbor is on channel 11* thought maybe his was interfering with mine .I am using WPA, I have disabled the power adapter from "saving power" in the adapter settings..
When the internet does drop off the DSL light on the modem goes out, and then comes back on..its not blinking off and on, just off.. then waits.. then reconnects to the net, it's almost like it's refreshing or something every couple of minutes.The modem is a Siemens Speedstream 6520
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Jun 28, 2012
We have two PIX515E ( 6.3), one is Primary( Active) and second one is Standby. after configuration of Secondary Firewall as Standby. getting problem.
1. Configuration part everything is fine
2.we have done failover text also .
Aster Some time , we are not able see Standby Firewall its going down .
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Sep 28, 2012
my ping spikes to 1k+ all the time, making online games pretty much unplayable. Sometimes I'll lag up to 3k ms and by the time my ping is back to normal, the game is so behind it is messed up forever.I've looked online for days trying to find solutions, and trying all kinds of things. The problem started after i reinstalled windows xp (it actually started right after my power flickered after i reinstalled, but i think that may be coincidence. I'm not sure though.). I've reformatted since then, but the problem still persists.I think the problem might be WZC, but when I try stopping the program like other people have done, my wireless network disconnects pretty soon after. I've also tried just using the intel software, but that didn't work either. It was fine for a while last night after I changed to the intel software, but after maybe an hour or so it went back to lagging.I have Intel PROSet Wifi agn 5100 as my network card. I'm on a laptop. I also tried doing a ping test in command on my mom's laptop, and it never spiked like mine. Is my network card maybe just too old? I got the laptop almost 4 years ago.
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Dec 26, 2012
There are 3 laptops in my house including mine, and i keep losing network/internet access every couple of minutes so I have to go to the router, unplug the device, and plug the device back in every couple of minutes, usually 10-15, although it varies, and the same has been going on with the two other laptops, so it's not just my laptop.
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May 24, 2011
My internet connction gets disconnected with in 1 hour . local area connection shows packets reciev and sent are in millions in 10 minuts . do i have a virus ?? or becouse of bytes sent and resived so much my internet gets disconnected. after disabling and reanabling my local area connection i can again use my net for some time.
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May 17, 2011
i have asa 5505 with the asdm v5.2 (4), and the asa v7.2(4). This platform has a base license. if i upgrade adsm and asa on v6.2(1) and v8.2(2) if I lose my license and that you need to activate them? i configured site to site vpn (this firewall and the another) that i lose my configuration if i upgrade my firewall.
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Sep 16, 2011
My internet stops approx in 10 min fo start of pc to an hour at times.Am not able to connect to router too.I have a wireless router and the PC is connected with a wire.The internet is not at fault as I can use the router @ laptop.Was on windows 7 Ultimate and all was working finer till 2 days ago. I thought May be I shoudl do a reinstall and installed my old and trusted win xp.Still its here. The win xp is completely updated and up to mark. I cannot even connect to the router 192 address when the internet stops.I have already changed dns to open dns. I remember that in windows 7 it used to show some dns /ip error , when I woudl trouble shoot at times and thus using open dns on router. Nothing working, and am going mad[CODE]
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Sep 7, 2011
My internet's falling out every half an hour, I'm having this problem for a long time and I'm getting really annoyed by it. It's always out for an average of 3 seconds. The reason this is annoying is because I'm a gamer and these dropouts cause me getting kicked for being unable to connect and such.
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Jul 8, 2012
I am updating my 8.2(3) code for my new ASA5512 that is running 8.6(1) and am unable to get on the internet with my current configuration from the inside interface.
Information:
Outside: ***.***.33.11
Gateway: ***.***.32.9
Inside: 192.168.215.0 /24
dhcp 215.100 - 150
[Code] .....
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Nov 5, 2011
I've noticed this in the last few days, but my internet seems to crash at the exact same time (29 past the hour) every hour. We've recently had a new modem in, and was working fine. I recently had a mass clearout of a lot of things in my PC (got rid of 500 gigs), so I'm wondering whether I may have deleted something which has caused this.
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Dec 4, 2012
I have a Linsys E3200 router for almost a year. It's been working fine until recently. It kept losing internet connection every a couple hours or even shorter. I have to power cycle the router in order to make it to work. However, sometimes that won't work either. I also tried to restore the router to the factory default but that doesn't seem to work.
I have updated the router with the latest firmware (1.04). I am using a cable connection and it never gives me any problem if I just connect my computer to it. I also test my network with another old netgear router that works just fine.
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Dec 25, 2012
I just upgraded from RV-042 to RV-042G on 24.Dec.
My previous connections are : (1st) 100Mbps ISP connection, (2nd) 200Mbps ISP connection (fibre to home)
Before upgrade, my RV-042 worked very stable.
After using Migration Tools by exporting RV-042 current config and converted to V3 configuration, the converted configuration was imported to RV-042G.
In beginning, RV-042G woks fine after imported converted configuration file. Unfortunately, after around 1 hour of use, my iPad (through an Apple Airport Extreme Station) and wired PC could not browse internet.
But, port-forward to 3 IP-cam still be able to access by my iPhon4 through Carrier 3G connections.
After a reboot of RV-042G, internet connection comes back. But, after an hour of use, the same issue happened again.
RV-042G makes me fluctuated. I will fallback to RV-042 from now on and wait for any further firmware improvement from Cisco/Linksys.
My previous RV-042 and current RV-042G config:-
* WAN1 : 100Mbps ISP connection
* WAN2 : 1Gbips ISP connection ( 200Mbps max throughput)
* LAN1 : connected to Apple Airport Extreme
* LAN2 : connected to Linksys 16-port FastEthernet switch
* LAN3 : idle
* LAN4 : connected to an Intel i7 PC
* Dual WAN link mode with bandwidth management, all internet connection from PC will stick on WAN2
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Mar 9, 2011
my internet cuts out every hour or so for 5-7 minutes. i have a linksys router and a Motorola modem. i am connected through the router into my modem. It is very annoying cause in the middle of playing my video games, i loose connection and i loose a bunch of stuff.
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Dec 30, 2012
I have a Cisco ASA 5510 with 3 inside interfaces each connected to a 3750X switch port in a vlan. Outside interface is connected to external router with 209.155.x.x public IP. Static route exists for outbound traffic on outside interface.
3750X is configured for inter-vlan routing. VLANs 10, 20, and 30 have 172.16.x.1 IP address with static routes pointing to the each of the ASA inside interfaces - 172.16.x.254. Connected hosts are configured with gateways pointing to the appropriate vlan interface IP - 172.16.x.1.
Inter-vlan routing appears to be working - I can ping back and forth between hosts on different vlans, and I can ping each vlan IP.I can also ping each ASA inside interface from a host in the appropriate vlan, but I cannot ping internet sites (4.2.2.2 or 8.8.8.8) from hosts on the inside interfaces.
I can ping 4.2.2.2 from the ASA CLI. I can ping internal hosts on vlans 10,20,30 from the ASA CLI. But, no luck with pinging from inside host to internet hosts
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