i got trouble for this ipv4 & ipv6 fragment trafic prob/attack.how do i prevent it from comming in to my network? is it way to prevent it in cisco router part?
View 2 RepliesI have a synology 1511+ nas. My network transfer speeds are very slow, < 1meg a sec in some cases. It's next to unbearable.Anyway was reading about this thing that said to ping it using the -f settings and here's the result.
C:UsersJason Fonseca>ping -f -l 2000 192.168.1.139
Pinging 192.168.1.139 with 2000 bytes of data:
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
[Code]...
The website said to adjust the MTU settings in order to get rid of this message but I don't know what to change.
What needs to be done here?
No changes made but router will lose all information for IPv connectivity. I have paid twice to support to fix this issue and it still occurs every few months. I tried rebooting router, and doing an IP Release/ Renew and router does not get IP address.
View 4 Replies View RelatedI have a virtual machine running in my desktop which connected on the gigabit lan port on EA4500 with firmware 2.0.37.What I want to be able to do forward a port that came from an external ipv4 address to the ipv6 address and a different port to my virtual machine (to remote desktop port 3389).The reason I want to convert the traffic to ipv6 is because virtual machine is running vpn and is not reacheable through ipv4 (unless bunch of routes are setup and things get complicated etc). I verified my phsical server and virtual server get both ipv6 ip addresses through ipv6 tunnel from comcast. Without tunneling I could not get ipv6 setup using automatic mode with comcast, it simply did not work for some reason.
View 1 Replies View Relatedhas quite frankly gotten me absolutely annoyed . I've tried just about everything, from using the netsh commands to changing the dns to 8.8.8.8 or that other one or the other. Nothing is working, I unplugged the router, problem persists, I disabled IPV6 problem persists, I restore, problem persists. The only clue I have is my router, and mysteriously, there are TWO of my computer on it. It might be nothing but most certainly has caught my attention. Also, it gives me this info about my media being disconnected
View 14 Replies View RelatedI've just want to confirm if I can protect a router (telnet and ssh) putting 2 ACL's (one IPv4 and other IPv6) on the same line vty. Something like:
line vty 0 4
access-class hostsIPv4 in
ipv6 access-class hostsIPv6 in
Do I have to use named ACLs?
I am using window 7 on my laptop. I am using broadband internet (not wireless etc) via my external lan card but IPv4: IPv6: No Internet access shows.
View 4 Replies View RelatedI have a dell inspiron 15 and I've been having trouble fully connecting to my wireless internet. It says I have signal but gets stuck on identifying the network and I have limited IPv4 and IPv6 connectivity.
Here's the ipconfig if you can identify the issue with it:
Windows IP Configuration
Host Name . . . . . . . . . . . . : M-PC
Primary Dns Suffix . . . . . . . :
[Code].....
our company backbone is hp 5406, and desktop switches are hp 2510 currently we are working with ipv4.if we want to start use IPV6 for test environment, what’s things we need to enable in our backbone/regular switches.i mean for example if we want to set static IPV6 address for 2 servers and send ping between them, or even make new vlan with IVP6 subnet, and use it like regular vlan but with static ip's(until we got ipv6 dhcp).i have hp 5406 manual for IPV6 but i can't understand what i really need to do for start using IPV6.
View 5 Replies View RelatedASA 5520 running 8.2
Is it possible to do static (inside,outside) with the outside address being IPv6 and the inside IPv4?
If yes, is it possible to do this in parallel with an existing static mapping that goes IPv4 to IPv4?
Would like to learn from you what tools I could use in a Network that provides IPv6 visibility and also completely blocks IPv6 from being tunneled through ipv4 only networks.
I have tested this from Linux running some internal penetration test apps,but specifically running Teredo tunneling in Local LAN that is able to completely bypass security paremeters such as websence filtering servers and be able to accessing internet IPv6 sites, even its equivalent IPv6 address based on its IPv4 PAT address could be pinged from outside.. is like the PIX firewall never existed - wide opened door .
Blocking in outbound and inbound direction udp ports 3545 and 3544 seem to done the trick in dropping IPv6 at the PIX/ASA from being tunneled out or in.. Is this so ? Realy ? not to fast!! None of our local systems - users PCs or servers have IPv6 stack enabled as a policy, however, in reality this poses a serious thread.
For example, Teredo tunneling running in a host inside LAN say by a user who is a hacker can use different UDP ports from the standard listening udp 3545/3544 ports, host will still be able to tunnel IPv6 through IPv4 again, in this case I want to have tool or a strategy that can detect this internally beside being blocked at the firewall, I am looking at AIP for our ASAs would this help? What other tools could I utilized to have some sort of IPv6 awareness in our LAN without having to rung IPv6 that can provide some visibility of this invisible traffic in IPv4 LANs.
Recently I wanted to setup IPv6 for my home network. I signed up for tunnelbroker.net service and was provided with IPs. Then I configured the IP address in my DIR-615. But It's not working..
Screenshot of IPv6 config (router) : Screenshot of my Win 8 network Config : I also tested at [URL] but failed...
I currently have ipV4 as the setting on my DIR-825. Other posts seem to want ipV6 which is more secure but is not possible with a DIR-825 Rev A1. I have two routers, a primary router (DIR-825 Rev B1) capable of ipV6 and a secondary router (DIR-825 Rev A1). If I implement ipV6 on the Rev B1 router but keep ipV4 on the secondary router, will this improve the security, or will it just mess things up so nothing works?Certain devices (cell phones and most Tablets) don't deal with ipV6 very well at all. The ones I have tested flat don't connect to the wireless network if the router is set at ipV6. Is ipV4 adequate for a Home/Small Business Network when trying to implement Remote Access and VPN?
View 2 Replies View RelatedI have a Dlink DIR-825 B1 with firmware 2.05NA. I recently reset it to factory defaults to make sure I didn't misconfigure something.
I have been struggling to get a IPv6 in IPv4 tunnel working with tunnelbroker.net. I think the issue is a problem with the router itself and i'm not sure how to get it fixed.
All of my machines were getting IPv6 addresses (both windows, mac, linux) but none of them seemed to work. All I was able to do was ping the gateway itself using the local lan address. In each case they were missing a default IPv6 route. If I added a default route then it would work.
I started looking at the packets using a network sniffer and the Router Advertisements all had a Router lifetime value of "0" which is RFC4816 speak for "don't use this router as the default router". So Windows/Linux is exactly right by not setting a default route.
The strange thing was that when I reboot the router I would briefly get a router advertisement with a lifetime of 1800s, the corrert prefix and dns server but then another router advertisement would come along 5 seconds later with a router advertisement of 0.
I have TCP' Other observations
... using 6to4 I would get working IPv6 address. The difference again seemed to be the Router Lifetime. But I want to use a permanent tunnel. I have found 6to4 unreliable.
... the router never responds to router solicitations. It only sends a router advertisement when it wants to.
... the router never responds to DHCPv6 when that is configured.
I'm working on a computer that has no connectivity on wired or wireless connections. the wired eth card is a broadcom netlink card and the wireless adapter is an atheros ar5007eg. I found the drivers for the wireless on acer.com and removed the driver that was on here at first and put the one from acer. i cant find a network in range but device manager says its working fine. Then I found out the wired connection isnt working either and im getting the same messages from windows troubleshooter. It says both are "experiencing driver or hardware related issues and "make sure your internet protocol bindings are correct - ensure that ipv4 and ipv6 are selected in the config for the network adapter". it links me to the connection properties and ipv4 and ipv6 are checked off for both. futhermore, in the connection status window it says i have no ipv4 or ipv6 connectivity.
View 6 Replies View RelatedI recently bought a SG200-08 8-port gigabit switch. The switch firmware is the latest (1.0.0.16). Everything works fine, except that packet loss I have when flood-pinging on the LAN.
I have 3 machines connected to the switch, they have 1000 full duplex links, they all have Ubuntu Linux installed on them, no limiting on the switch (as far as I can tell), no limiting on the machines (nothing like htb, cbq), no QOS set up on the switch, the machines are fairly OK hardware-wise (dual-core, quad-core, six-core). And still, it doesn't matter which way I ping, I get a consistent packet loss of 5-7% when flood pinging:
gimre@voy:~$ sudo ping -n -f 172.16.21.4 -c 10000 -q
PING 172.16.21.4 (172.16.21.4) 56(84) bytes of data.
--- 172.16.21.4 ping statistics ---
10000 packets transmitted, 9247 received, 7% packet loss, time 14944ms
rtt min/avg/max/mdev = 0.036/0.062/0.290/0.035 ms, ipg/ewma 1.494/0.051 ms
I'm just wondering if its possible to ping an IPv4 host using the IPv6 host assuming that the NAT64 has already been implemented?
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well a couple days of go it was working fine until i updated windows 7 now it says im connected to the internet but when i go on it dosnt load anything, and when i go check it says that "IPv6 connectivity: No Internet access" how ever the IPv4 is connected to the internet, should i restore settings to osmetimes earlier this week
View 2 Replies View RelatedMy laptop is not connecting to the internet, I know that it is not a router problem as my mine PC and Notebook are connecting with no issues.I have removed all router devices as had an new once once it was last working.I tried this morning to set it up again without success. I have compared to setting with my pc and have found the difference is with the IPV6 connectivity.
View 6 Replies View RelatedI am trying to use my WRT120n as access device for an IP Centrex service using SIP protocol. My SIP phone is located right behind the router.My problem is sometimes the router is dropping incoming calls because signalling packets are fragmented at IP level. So I cannot receive those calls.Is there a way to enable the router to accept these packets?
View 9 Replies View RelatedAn IP packet of size 1500 bytes passes through two network segments before it reaches its destination. The header size of this packet is 20 bytes. The maximum size of an IP packet in the first intermediate network (its MTU) is 1024 bytes, and that in the second network is 576 bytes.Explain how the IP packet described above would be fragmented into smaller parts in a router, paying particular attention to the flag bits and to the fragment offset field in the header.
- Fragmentation and reassembly needs to break a data-gram into an almost random number of pieces that later can reassembled.
- It uses the identification field to ensure that fragments of different datagrams are not mixed.
- IP packet of 1500 bytes comprises 1480 bytes of data and a 20-byte header.
- In the first intermediate network, the packet size of 1024 bytes allows for 1000 bytes of data plus a 20-byte IP
header.[code]
Currently in my office have a TPlink wireless router (WR1043N), and Dlink 615 router.Below is my office's network organization.Internet-->TPLinkRouter(192.168.2.0)-->DlinkRouter(192.168.0.0)We want to host a demo website but we are afraid our network being attacked. So we wish to implement a DMZ network to hide our internal network from outside. My question is can i setup a dmz network with the above capabilities by using home routers?
View 5 Replies View RelatedWhat is the part number of the power-supply of this router (WRP400)? [code]
View 6 Replies View RelatedDropped VPN connections.I experienced a similar issue a few years ago with my LinkSys WRT54G router with dropped connections to my corporate network using the Cisco VPN Client. To make a long story short the problem was the result of the following:
1. The default ""Client Lease Time" on LinkSys routers is 0 which means 1 day or 24 hours.
2. By DHCP Protocol definition, DHCP clients must renew the DHCP client IP address lease at the 1/2 life cycle of the lease (12 hours if using the router's default setting). This is deadly for VPN clients as the short period of time when the client IP address is no longer valid, the VPN client considers this a loss of network connection. The LinkSys E-series routers further aggravate the situation by randomly assigning new IP addresses to DHCP clients instead of reassigning the client's previous IP address and tends to favor higher host IP addresses in the defined range.
Suggestions to prevent lost VPN client connections:
1. Change the "Client Lease Time" on the router to 8640 minutes (6 days 00:00:00).
2. Prior to establishing a VPN client connection, use the Windows Command Prompt to issue the "ipconfig /renew"
command to obtain a new IP address from the router that will be good for 3 days (72 hours).
3. Configure your E-series router to use the <DHCP Reservation> option to pre-assign IP addresses to your systems making sure they are outside the range of the dynamically assigned DHCP addresses. Using default settings,these would be in the range of 192.168.1.2 thru 192.168.1.99 as the router starts at 192.168.1.100 thru 192.168.1.149.
I'm trying to set up a minecraft server i have the correct ipv4 adress and port but for some reason its still closed?
View 7 Replies View RelatedI have a 3825 router running 12.4t IOS. I installed DSU/CSU part number HWIC-1DSU-T1 in the router and it does not recognize it. Is this the right card for this router? Is there anything I can look at to determine the issue? I think the router only has 32M RAM. Below is a show hardware. Card is still currently installed.
View 2 Replies View Relatedi have a dpc3825 cable mdem gateway i spent 4 hours on the phone with charter yesterday i cant access the admin part of the router i go to 192.168.0.1 and up comes the setup username and password i have reset it numerous times i have left it blank as per instructions i have tried admin and blank cusadmin and password i cant get in
View 1 Replies View RelatedI'm in process of purchasing a new Cisco routers for our branches that will be used primary to enable IPSec virtual tunnel interfce with "tunnel mode ipsec ipv4". does the default IOS IP Base supports this feature? or i need to purchase DATA license or SECURITY license?
View 4 Replies View RelatedWe have 9 WLCs around a corporate network. Each of the WLCs was in the same mobility group for failover purposes, and to permit APs to reconnect back to their primary WLC in the event of a failover.
However one of the sites has now been sold and pending separation of the LAN infrastructure the APs need to be isolated and prevented from associating with any WLC other than their primary (on site). From our experience once the APs know about other WLCs they retain this list in NVRAM even if the secondary WLC is removed from the configuration they will still associate with one of the known APs if possible (Cisco document this). WLC v 8.1.185.
I share my internet connection with my roommate who is very tech savvy. I found out yesterday that he has been hacking into my gmail account and reading my emails. I didn't think it was quite possible and I'm very surprised. He manages the internet connection and has full access/control over it.what can I do to prevent him from accessing my information?
View 3 Replies View RelatedI live in a shared flat. And all 20 rooms are connected to this switch I believe. Is there any method to prevent the landlord/tech guy monitoring our internet activity (e.g. bandwidith activity, websites we looked at, etc.
View 5 Replies View RelatedI have high speed wifi at home and the wifi is WPA-PSK protected. My neighbour will be coming to my home to work with me and I will be keying my wifi password into his Windows XP laptop for him to access my wifi.
This is one time access only, after that he is not allowed to access my wifi. To prevent him from accessing my wifi, I will have to delete the password that I keyed into his laptop.
Where do I find this wifi password in the Windows XP? What folder and what filename?
I am trying to configure Zone Based Firewall (IOS 15.2T) on Cisco 881 router for IPv6. Current setup is simple:
Zone:
LAN --> WAN zone security LAN
zone security WAN
!
class-map type inspect match-any Internet-cmap
match protocol dns
match protocol http
match protocol https
[ code ] ........
Current configuration behaves as expected for IPv4, but blocks all IPv6 traffic. If zone-security is removed from WAN interface IPv6 works normally (connected to Internet). As soon as zone-security is enabled on WAN interface all IPV6 traffic is discarded when connecting to Internet from local LAN.
Error messages on console: Half-open Sessions source destination tcp SIS_OPENING/TCP_SYNSENT
Are there any special settings for ZBF which should be turned on for IPv6 protocol?