Routers / Switches :: Why Can't Ping Computers On Separates Subnets
May 21, 2012
My new employer has asked me to determine any issues that could be causing performance issues our LAN. The network has two subnets and one of the first things that I noticed is that I cannot ping computers on subnet A from subnet B. I've looked into this and found a few things.-I CANNOT traceroute to computers on subnet B from subnet A-I CAN NMAP to computers on subnet B from subnet A-Computers on subnet A CAN ping other computers on subnet A and computers on subnet B CAN ping other computers on subnet B-Computers on subnet A CAN ping and access servers on subnet BI am relatively new to networking and not exactly sure where to start investigating this problem.
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Apr 23, 2011
how to connect two subnets with two switches and one router using router sim software?
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Jun 25, 2011
I'm trying to set up 2 separate networks in my home, both of which have access to the internet through a single ISP.I have set up my networks using 2 routers as described in the "Version 2" scenario found here: url...The problem is, a computer connected to the LAN side of Router 2 is able to ping and map shared folders on computers connected to the LAN side of Router 1. According to the writeup (last paragraph), this should not be the case.I have been over the setup multiple times to ensure it is per the writeup but each time, I am able to ping and map.Is there some additional router/computer settings that I may be missing?FWIW, here's my take on what is happening (with the ping): When a computer on the LAN side of Router 2 (submet 192.168.1.x) does a ping to a computer on the LAN side of Router 1 (subnet 192.168.0.x), Router 2 sends the request to its Default Gateway (since it's a different subnet).Router 1 however, recognizes this as its LAN side subnet and forwards the request to that computer. The ping response is then routed back from Router 1 to Router 2.
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Aug 15, 2011
When I ping an address from my windows machine, it succeeds, but when I ping to the same IP on my MAC OS X machine, it fails.
1. Why?
2. How to get successful ping on my MAC machine?
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Dec 26, 2011
I'm having trouble trying to connect 3 computers via LAN for gaming using straight Ethernet cables and a net gear router. Only 2 computers seem to connect at a time. All 3 can connect to one another (one at a time) and the I.P. addresses have been set to 192.168.0.1 , 192.168.0.2 and 192.168.0.3. The cables work fine and the computers, but I'm wondering if I'm using the wrong kind of hub/router?
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Mar 13, 2011
I have two groups of students I wish to seperate by subnetting. Students are nine in each group, and there's one Cisco router (or W-server set as a router). After giving group A an IP of 192.168.200.1, and group B an IP of 192.168.200.129 and connecting each interface to it's own seperate switch, what else does each PC user need to do to establish communication with members not in his/her own subgroup?
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Aug 3, 2011
I am having 2 Pc's and 1 ISP. I am havng a DSl modem cum router. Is it possible to connect two computers with 2 different ip addresses from same ISP? My ip address is a static one btw..
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Jan 17, 2011
We need internet connectivity on all workstations
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Feb 16, 2011
One computer is an iMac running Snow leopard and the other is running Win 7. I wish to switch either computer to any of the two printers.
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Jun 12, 2011
I recently got a new Toshiba laptop, which works perfectly. We already have an HP desktop PC as well as a Dell laptop, which are both connected to an Ethernet router. When I got my Toshiba, I couldn't connect to the router, whether from a new Internet cable, the cable the Dell uses, or the cable the HP uses (it works perfectly fine with Wifi). The next day I got up early and tried again, and it worked. The HP was turned on, and it connected. But then the Dell wouldn't. Over the next couple days, we realized the problem was that the router only allowed the first two computers that were connected to it to connect to the Internet, but not the third one. The router itself allows eight cables to be plugged into it at a time, so I don't see why it's only allowing two computers, whether laptop or desktop, to connect. Is there a possible solution to this?It's an 8-Port Workgroup Switch, Model EZXS88W.Also, our router DOES NOT support Wifi
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Mar 22, 2013
4 pcs are connected to a adsl bb router having 4 lan ports. i have removed the adsl cable going to the bb router cos bb giving problems. i m then connecting to internet on any one pc using a tata photon usb device. i want to share this internet on other 3 pcs. those 3 pcs are getting their ips from the bb router in 192.168.1.x series. all pcs are pinging to gateway ie 192.168.1.1 but not pinging each other. why?
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Jan 13, 2012
I have two windows 2008 machines on vmware. I assign 10.0.0.1/8 and 10.0.0.2/8 to them. Both connected to same virtual switch. Now should these two PCs ping each other? In my case they dont ping. What i get is Repy from <ip address>: Destination host unreachable.
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Apr 13, 2011
what port number does ping use?
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May 21, 2011
I just installed a new ASA 5505 for an office with three internal subnets.* The three networks can each get online fine and ping eachother, but cannot browse to shares on the two internal networks other than their own.* How do I configure the ASA to allow all traffic between these three inside networks?
192.168.152.0
192.168.152.0
192.168.154.0
[code]....
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Feb 25, 2011
every time i try to acces my linksys router my IE just auto adds http:// and opens google search results. I cannot make IE not auto add that freaking http thing, on the old win XP i could type in 192.168.1.1 and it just went straight to my router login. Do i disable this IE auto http crap? i simply cannot acces my router anymore??i can ping the router, even using Cisco network magic pro I tried to reset router checked my internet settings everything works fine, this pc has a dhcp auto configuration etc.
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Mar 17, 2013
ping 10.0.0.1 -t give me destination host unreachable in the same time when i wright ping 192.168.1.1 -t it give me the correct reply but the net doesnt work
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Oct 6, 2011
I have 2 sub nets and 2 up links
port g1 = 211.122.10.x
port g2 = 210.211.10.x
Can use 1 switch (sf-300 24)
assign port 1-12 up/down to g1
assign port 13-24 up/down to g2
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Mar 21, 2012
I have two separate companys both with staff at two locations and thier own networks connected with a wireless antenna which provides a high speed LAN connection between offices. I only have a single path through this antenna bridge. I have an SG200-08 switch at each end. What I am attempting to do is utlise the switches to take the two subnets at one office, combine them to one for transfer through the antenna bridge, and then resolve them into the two separate networks again at the other end.
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Jul 24, 2011
I have two work laptops connected wireless on my home network. I can see the computers and ping them but i can't see shared folders. These work fine at work. On wireless i am set for obtain address from router DHCP (linksys E3200). Both are on the same ip range. Both are on Win XP pro. I have Everyone in all share permissions and also in the security tab. Both machines when at work are on the same domain but one is a local user on the domain. Simple file share is not selected.
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Jan 16, 2012
if you have two no of win 7 computer , and you run ping command at the same time at both PCs but the successfull at only one PC , second computer shows unsuccess full ping
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Dec 9, 2012
Region : Kazakstan
Model : TD-W8951ND
Hardware Version : V4
Firmware Version : 4.0.0 Build 120207 Rel.10587
ISP : Megalne
I have two comps in LAN (Ethernet) - one (Comp1) in WinXP, another (Comp2) in Win7. IPs for both comps are assigned by DHCP. Internet is available for both Comps and for assigned wireless units. So the router is configured almost well. But I lost my home net: can't see or ping anything in LAN. Setting of static IPs (192.168.1.4 and 192.168.1.6 are permitted)
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Jan 12, 2012
Is it possbile to NAT to other subnets with the RV082. It is on a 192.168.41.x and I have a phone system on a 192.168.20.x. After searching all over others are saying no.
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Sep 6, 2011
I have three routers and 2 ISPs but I'd like to focus for now on a configuration with only one ISP provider. Here is my environment:
Netgear Cable (CBVG834G) wireless routerON the cable router are connected multimedia type equipments (TV/ IP set top box/ IP amp ) located on the family room DHCP ON (because I can't get internet connectivity when I assigned Fix IP address I come to that later) IP Adress:192.168.1.2 DHCP range:192.168.1.10/ 19 Reserved IP : 1292.168.1.10 for the Dlink 4 DEV a connected D-LINK ( DIR-855) wireless router.mainly PCs, NAS (x2) located on the first floor. DHCP ON Lan IP Adress: 192.168.0.1 DHCP range:
192.168.0.100 / 120 WAN Ip address : 192.168.1.10 6 PCs are connected
Everything works fine from an internet connectivity standpoint:
DEVx can connect to internet fine
PCx can connect to internet
PCx can access DEVx
Now the issue DEVx can't access resources from PCx!
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Dec 21, 2011
I have a static DSL connection and my ISP is giving me 4 static IP's. I have connected my RV042 to the DSL modem and I have now 1 subnet at 192.168.0.0. What I want to create is a WEB server/ Email server, but to sit on a different subnet - 192.168.5.0. For now I have connected the server to the DMZ port, but I am unable to to access it from WAN, only from LAN. How to configure properly the 2 subnets (192.168.0.0 and 192.168.5.0) and how to forward my static address to the server which I which to be on the 192.168.5.0.
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Dec 10, 2012
At the small church I attend, and where I'm the IT guy, we have an RVS4000 router which has worked well for us including the VPN capability. Our internet connection is through AT&T (not my choice) and last week we had to switch from DSL to U-Verse because AT&T is doing away with the former.
Unfortunately as part of this switch, the old modem was discarded and an NVG510 installed. The NVG510 is a combo modem/router. But since it doesn't have VPN capability and is not as good a router all around as the RVS4000 (even though the 4000 is an aging device), I am trying to run both.
I finally figured out how to set up IP Passthrough on the NVG510 so now VPN is again working to the RVS4000 so that's not an issue. We do have a couple of PCs that are in a room where no wired connections are possible so they are using wireless. But they are not very close to the wireless antennas so they don't have the greatest throughput. The NVG510 does have wireless capability and is physically located to where it would provide a much better signal. However, the NVG510 will only use a 192.168.x.x subnet and our LAN is setup for 10.x.x.x. I'm not about to change the LAN as it runs a Windows domain with enough equipment that I don't want the exercise of changing subnets.Can the RVS4000 be setup so that it will route domain traffic between the 2 subnets? As it is now, connecting a PC to the 192.168.x.x subnet on the NVG510 allows it to have internet access but it can't access domain resources on the 10.x.x subnet. I don't understand networking well enough to know why this won't work. I know it can because when I worked for a large corporation, they had different subnets that were routed so that PCs on one subnet could be on the same Windows domain as PCs on another subnet and all access resources on both subnets.
The RVS4000 may be capable of doing this but my limited knowledge of networking (I know servers, not switches, etc) means I'm not sure of what I see on the router to know if it can do it or not.I'd be appreciative to know first off if the RVS4000 can do it, and secondly if it can, then how to set it up. I've worked with the RVS4000 since we got it 3+ years ago so I'm fairly familiar with it, I just don't know the rest.
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Jan 22, 2013
Here's what I want to do with my RV042: I have a bunch of devices, including a server, inside my network at 192.168.1.100
I've set up VPN using PPTP. It works, but if my clients have their own remote DHCP set up to 192.168.1.x, they can't get to the server. If their home DHCP is 10.x.x.x., everything works
I am considering changing my internal network to something obscure.
My server has two NICs. So I thought, I why not set one address up to 10.x.x.x But the two nets can't ping each other. I tried using "multiple subnet" on the RV042, setting up 10.1.1.1, but no luck.
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Nov 17, 2011
I am in the process of migrating our existing server farm subnets to our new Nexus server farm and I discovered something I wasn’t expecting. My intention is to migrate our existing legacy server farm which is comprised of for paired 3750 switches off of our core 6509s and onto the Nexus and connect them to the 2232s via multi gig port-channel connections, two port channels per switch stack.
NOTE this is expected to be a temporary move as next year we intend to install additional N2Ks and move servers over to these directly. But to minimize the outage/downtime it will be better to move the subnets and switchs all at once.
These connections would be grouped 1 gig connections as port channels, one from each switch into one of the two 2232s.
Problem I discovered is Cisco does not intend to have switches connected to the Nexus and it immediately disables the ports when they see BPDUs.
I found a config that does work and it does fail over from one port-channel connection to the other but with the limitation that when the original port channel comes back online it does not fail back over to the original one, an acceptable situation for us. But I am wondering if Cisco would support this design if we did experience issues down the road.
The only issue I really see is to get it to work the config is different on the two N5Ks, see the pert config below for the connections. Both are running the same OS
augs1-ba-ar17# sh ver
Cisco Nexus Operating System (NX-OS) Software
TAC support: [URL]
[Code].....
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Mar 18, 2012
just replaced a WRT54G with E4200. Most functions work well. 4 wireless computers (1 Macbook, 3 Win 7), 1 wireless android, 1 wired Win7 computer, 1 ethernet connected hard drive, 1 ethernet connected printer. All computers can ping router, access hard drive, access internet, ping android and ping Macbook.However, router, nor any computer, can't ping Win7 computers. Apparently IP based connections between WinX computers is blocked. My real applications are to Remote Desktop Connect from 1 Win7 computer to another, or to run a DLNA music server on 1 Win7 computer, accessed by another. (the LAN connected computer is the server, accessed by a wLAN client. All worked fine on WRT54G router, but can't connect thru E4200. When these apps failed, I tried PING, and that failed as well.All computer's IP addresses are properly served from E4200 via DHCP, and are visible thru the router's DHCP Reservation panel.
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Feb 14, 2013
I have five static IPs that I would like to fully utilize, by NAT'ing them to internal VLAN subnets.I read that the RV180 can do this, but I am having difficulty in finding a working recipe.I have assigned xxx.xxx.xxx.2 to the RV180 WAN interface.
I have created four additional VLANs 2-5 and assigned to ports 1-4 with subnet interfaces 192.168.2.254, 192.168.3.254, 192.168.4.254. and 192.168.5.254,I have set the default VLAN to untagged on all ports. VLANs 2-5 are set to tagged for their respective port (1-4) and exclude for other ports.I have set DHCP relays to 192.168.1.202 which is my DHCP, DNS, AD services.
I read some months ago that when the first static IP address is assigned to the WAN port, that the VLAN ports will accept tagged packets on their ports and NAT them to the respective successive static IP (sounds a bit like magic to me). Regardless, I read that the RV180 can provide VLAN subnet NAT to up to 5 static IP address. I am not looking for 1 to 1 NAT, not the same. I want to perform NAT on the four additional VLANs in the similar manner that VLAN 1 (default DMZ) IPs are NAT'd to the static WAN address. As in everything outbound on 192.168.1.0 is NAT'd to xxx.xxx.xxx.2
Additionally I would like all DHCP assigned by my DHCP server which I believe is accomplished with the DHCP relay setting on all five VLAN subnets, which point to the DHCP server 192.168.1.202
Lastly, I am trying to configure VPN connectivity into my DMZ network. I have configured a few accounts, enabled for PPTP. I have configured PPTP and am issuing 192.168.1.70-80. The VPN connection seems to work great without the use of Cisco quick VPN. I can see the remote picking up the 192.168.1.71 IP address as the VPN connection is made. From the remote I can ping IP addresses on the DMZ subnet 192.168.1.X How can I configurer the Cisco RV180 PPTP server to provide the DMZ DNS ipaddresses? These addresses need to be 192.168.1.201 and 192.168.1.202
I feel I am almost there, in working out the VLAN subnet to Static NAT. I suspect it will be some routing configurations. The ISP business gateway on the WAN side that I point my router to which is owned by Verizon, is xxx.xxx.xxx.1 I have a /29 making IPs xxx.xxx.xxx.2-6 available to me.
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Aug 5, 2011
We have 4 RV 042 routers and cisco router at HQ, we have Site to Site VPN tunnels in between, All branch offices are connected to HQ via S2S VPN tunnels
10.10.1.0/ 24 HQ
10.10.2.0/24 Branch 1
10.10.3.0/24 Branch 2
10.10.4.0/24 Branch 3
10.10.5.0/24 Branch 4
now lets say i am branch 1, i can access 10.10.1.0/24 network but cant access 10.10.5.0/24 network, means i dont have branch to branch connection, it should be through HQ, means my RV042 at brnach should fwd all traffic to HQ for another branches also. Under VPN tunnel if i try to configure remote destination 10.10.0.0/21 its not allowing me it says network overlaping with local network, how i can sole it, I know how to do in cisco, we can permit those networks in access lists.
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Nov 17, 2012
I have a WRT54G that has worked fine for years, with some PCs hooked up with Ethernet and various other devices connected wirelessly. I came home this afternoon and nothing going through the router could connect to the internet. I've made no changes to anything recently.
I did troubleshooting with Comcast, and we determined that when their modem was hooked up directly to my computer then that computer could connect to the net. Problem solved as far as they are concerned--my router is busted. But I can still connect to the router, and enter its admin screen, and everything looks fine there. The computers on the router can all see each other. So the router is working.
Once I hooked it back up to the modem my computers all lost their internet, but the router does get an IP successfully from Comcast. And it even assigns IPs to my computers that are hooked up to it. It's just that for some reason they still cannot get past the router.I used the ping function in the router admin site and the router pinged Google no problem. My PCs can ping the router without difficulty. But the computers cannot ping Google.
I've tried every combination of power cycles and reboots you can name. I've tried duplicating the MAC address of the PC that connected to the internet onto my router. None of it has made any difference.
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Aug 16, 2011
We have Point to point T1 environment where 3 additional WAN sites get internet access through our RV042. When we setup load balancing we have problems with https traffic, so we setup protocol binding for https and everything worked great from the local LAN. When trying to access https content from the remote LAN across the WAN the sites failed and I see no option to add additional subnets to the protocol binding. Is there a command line feature that supports adding additional subnets for protocol binding or is the local LAN the only option?
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Jan 4, 2013
I have setup 15 x RV180W's so far for a particular client.They have requested that we add a Corporate Wireless VLAN for their laptop users (not guests) and add a Special Use WiFi VLAN for a particular mobile platform that is being deployed (in this case we need 2 separate WiFi VLANs to ensure compliance).Also, none of the VLANs can talk to eachother and they have their own subnets.I have the Wireless and VLANs setup, no problem... but I am having an issue wiht the VPN settings.I have the wired network's subnet working fine. But I do not know how to add the subnets for both Wireless VLANs to the traffic selection.The IP schemes will not allow me to just select a large subnet... here are some examples:
Wired VLAN: 10.10.x.y
Corporate WiFi VLAN: 10.15.x.y
Special WiFi VLAN: 10.18.x.y
x is the octet that defines the physical unit location (unit 1 = .23, unit 2 = .24, etc...) y is the octet the host.Since they are not in a contiguous block, I cannot just use a larger subnet mask.I can add multiple traffic selection rules to the ASA5515 at HQ, so that side of the tunnel is perfect... I just don't know how to add the three VLANs to the RV180. Is it as simple as using commas or semicolons?
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