Defining VPN Subnet Mask?

Howdy,
Ok this problem occurs on Windows Vista, and is, to my knowledge classed as a bug, as it never occured on XP. So when I migrated over to OS X I assumed it would not be there... I was wrong, cos it is!
I connect to several VPNs to access MySQL DB's, and I use these everyday and are very important. Now a few of the VPN's use a subnet mask of 255.255.255.0, like most connections. Now the other VPNs use a subnet mask of 255.255.240.0, and when connecting to these VPN's OS X just assumes the subnet is 255.255.255.0 and therefore, even though it connects fine, I cannot access anything on this server cos of this problem!
Now the only way, to my knowledge, around this is to run the ifconfig command to get my assigned IP Address, then run the command:
sudo route add -net 192.168.16.0 192.168.16.* 255.255.240.0
Where * represents the last 1/2 digits of my assigned IP address. This does work, but is quite frustrating, just as it was running the "route" command on Vista.
Does anyone know of a way around this? So I can tell OS X to add me a subnet mask of 255.255.240.0? Or even a way in OS X to automatically run the above command via terminal when I connect?
Any help will be appreciated!
ta
Steve M

Do you know how I can join my office domain via the PPTP connection? I've triend both the QuickVPN client as well as, Windows built-in VPN connection. I've only been able to successfully connect using Windows VPN connection. I could not get QuickVPN client to work.

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Why is the subnet mask 255.255.255.255 and how can I change that?

Read http://en.wikipedia.org/wiki/Subnetwork
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Subnet mask 255.255.255.255 assigned to VPN client - can't ping LAN

Hi,
I configured PIX 501 with PPTP VPN to connect to the small office (PIX FW, Win 2000 Server, several Win clients, LAN IP 10.0.0.X/24):
ip local pool mypool 10.0.0.101-10.0.0.105
vpdn group mygroup accept dialin pptp
vpdn group mygroup ppp authentication mschap
vpdn group mygroup ppp encryption mppe 128 required
vpdn group mygroup client configuration address local mypool
vpdn group mygroup client configuration dns 10.0.0.15
vpdn group mygroup pptp echo 60
vpdn group mygroup client authentication local
vpdn username xxxx password *********
vpdn enable outside
I can connect to the office using Win VPN client, but I can't ping any hosts in the office network. I suspect that the reason for that is subnet mask assigned to the VPN client: 255.255.255.255. ipconfig of the VPN client:
PPP adapter Office:
Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 10.0.0.101
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . :
Default GW is missing too, but I think this is not the main problem.
Any way, what is wrong with my config? How to fix subnet mask assigned to clients? Or may be my assumption is wrong and this mask is ok? What is wrong then?
Any input will be greatly appreciated!
George

Thanks for the prompt reply.
Here it does:
PIX Version 6.3(4)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password xxxxxxxxxxxxxx encrypted
passwd xxxxxxxxxxxxxx encrypted
hostname OSTBERG-PIX
fixup protocol dns maximum-length 512
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol tftp 69
names
access-list 80 permit ip 10.0.0.0 255.255.255.0 10.0.20.0 255.255.255.0
access-list inbound permit icmp any any
access-list inbound permit tcp any any eq pptp
access-list inbound permit gre any any
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside 66.189.xxx.xxx 255.255.252.0
ip address inside 10.0.0.23 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
ip local pool mypool 10.0.0.101-10.0.0.105
pdm location 10.0.0.0 255.255.255.0 inside
pdm location 10.0.0.15 255.255.255.255 inside
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
access-group inbound in interface outside
route outside 0.0.0.0 0.0.0.0 66.189.yyy.yyy 1
timeout xlate 0:05:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server TACACS+ max-failed-attempts 3
aaa-server TACACS+ deadtime 10
aaa-server RADIUS protocol radius
aaa-server RADIUS max-failed-attempts 3
aaa-server RADIUS deadtime 10
aaa-server LOCAL protocol local
http server enable
http 192.168.1.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
sysopt connection permit-pptp
telnet 10.0.0.23 255.255.255.255 inside
telnet 10.0.0.0 255.255.255.0 inside
telnet timeout 5
ssh timeout 5
console timeout 0
vpdn group mygroup accept dialin pptp
vpdn group mygroup ppp authentication mschap
vpdn group mygroup ppp encryption mppe 128 required
vpdn group mygroup client configuration address local mypool
vpdn group mygroup client configuration dns 10.0.0.15
vpdn group mygroup pptp echo 60
vpdn group mygroup client authentication local
vpdn username ********* password *********
vpdn enable outside
dhcpd lease 3600
dhcpd ping_timeout 750
dhcpd auto_config outside
terminal width 80
Cryptochecksum:xxx
: end
There are remnants of old config, I just recently took over this network, some lines look odd to me, but I did not touch what works. VPN config is all mine.
PIX internal 10.0.0.23 - is a gateway for the network. DNS server in LAN - 10.0.0.15.
I've been reading about the problem and came across several posts that this subnet mask is normal, but it puzzles me - how can this host communicate with anyone else if there is no room for other hosts in this network (according to the mask)?!
Thanks again!
George

Wlc 5508 webauth subnet mask change issue

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New Config
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WLC 5508 Controller Interface
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     10.10.0.25
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If l modify the above interface and scope masks back to a /24 - 255.255.255.0 the the wireless clients connect and webauth appears to prompt them to accept the terms and conditions and connect thus giving them internet access.
It looks like an issue with the mask ? The main reason l am trying to change the subnet addressing is because the standard /24 mask is not providing enough dhcp addresses and we have had times were the scope has been exhausted due to the public connecting and disconnecting as the lease perod of 2 hours holds onto the address before expiring meaning there is not enough available addresses for people to connect.
I would of thought that the upstream router ( RV042 ) even though it is only a /24 mask would still route the traffic coming from a WLC Controller interface with a /22 mask ?
Hopefully someone can suggest a solution ?
Thanks Simon

Hey Scott just getting back to this issue..   If for instance l can modify the wlc interface and Scope to have a /22 mask ( 1022 Hosts ) and my upstream Router ( Cisco RV042 ) can only provide a /24 or higher mask then does that mean l am still limited to a range of 254 hosts ( /24 Mask ) ? Would this mean l need to look into replacing my upstream Cisco RV042 VPN Router ?

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hello,
with the use of a wild-card mask we can gain control over route update propagation.So we can define which networks should receive updates and which networks should not receive routing updates.Its just like wildcard masks used in ACLs.this is my view
cheers,

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Hello all.. kinda new to this stuff and was looking around for an answer, but couldn't find my exact situation. So, forgive me if I ask some stupid questions... Ok, I have MacBook Pro, and recently had to do a reset on my modem/router, and now this particular computer won't connect wirelessly. I also have a macbook air, and connects fine wirelessly. It seems I have narrowed it down to the subnet mask... maybe, but not completely sure. Just to be clear, I don't have the Airport express, I am just simply talking about the airport function built in to connect to a wireless network (not sure if it's called something different, or is the one on the actual computer just called airport?). So, going into the airport utility does nothing for me. It can't find any wireless devices. And everything I have read has been talking about going into that program and changing things. Anyways, I tried connecting automatically (using DHCP) and manually, but nothing helps. My macbook air gets a subnet mask of 255.255.255.0, while it has now started giving my macbook pro a 255.255.0.0. And I'm assuming my router is still configured for 255.255.255.0, but now my computer isn't.. How is that possible? Just wondering if anyone knew why this was happening and/or how I can fix it. Like I said, I'm not a genius with this stuff, but any help would be appreciated. Thanks for your help! And if I have missed any important information, let me know..

Unless you have an Apple-brand Wi-Fi base station, AirPort Utility is of no use to you.
It might help to reset the connection settings on your MacBook Pro using these steps one at a time until the problem is resolved, recognizing that, depending on your problem, not all of these steps will make sense:
1) Use the AirPort menu bar item to turn AirPort off, then on again.
2) Try to select your Wi-Fi network from the AirPort menu.
3) In the Network panel of System Preferences delete the AirPort item from the left column, then add it back.
4) In the same panel as (3), define a new location and see if you can make that work.
5) In the same panel, select the AirPort connection item, click the "Advanced" button, select the "TCP/IP" tab, then click "Renew DHCP Lease". Note that the fix this step implements may be temporary.
6) In the folder /Library/Preferences ( _not_ <yourhomefolder>/Library/Preferences), move the folder SystemConfiguration onto the Desktop, then restart your computer. See if you can now make your AirPort connection work.
These steps may not help, but they'll only take a couple of minutes to try. Before you try these, if you have any special network settings on your Mac for things like DSL credentials, note all your network settings, because the latter steps will destroy them. If you got all the way to the last step, if things don't work any worse than before, you can trash the saved SystemConfiguration folder.

The subnet mask on the Extreme isn't the same as on the Express.

Dear Group,
I have my Extreme configured to do PPPoE and DHCP and my DSL modem is setup as bridged. Everything is finally working well. I have an Express extending the Extreme in a WDS.
When I look at the PPPoE tab in the Internet tab of the Extreme in AirPort Utility it shows a subnet mask of 255.255.255.255, but the Internet tab of the Express shows 255.255.255.0.
I don't have any problems at all and wireless clients are connected to the Extreme and the Express.
Is the Extreme's subnet mask part of my DSL connection and therefore a different subnet mask?
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Thanks,
Frank

This really isn't an issue as long as the AirPort Extreme base station (AEBS) is providing a working Internet connection. Since the AEBS is using PPPoE to connect to your ISP I'm not sure that the subnet mask is even used.
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HT1218 I'm trying to set up a new iPad..it asks for my WiFi network.. I find the network..then it asks for information that I have no idea about: IP address, Subnet Mask, Routet, DNS, Search Domains, Client ID..also the headings are: DHCP,BootP, Static..c

I am trying to set up my new iPad. it asks for a WiFi connection.. I have one..then the next page asks for these things:DHCP,BootP,Ststic then IP address, Subnet Mask, Router, DNS, Search Domain, Client ID then HTTP Proxy I have no idea what any of this means...can someone please help me???

Thank you sooo much. I was so disappointed...I couldn't wait to get started with the new iPad..then ran into the problem. So simple. You made my day. Thank you for your expertise!!

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My network has not been working today. When I click on it it says "unable to access nhe network". My guest network will work. When I hit the blue arrow on the right hand side of my network there is no information in the IP address, subnet mask, router, etc. There is information in my guest section when I checked. I have unplugged and replugged my router and turned my Wifi button of and off, started and restarted my Ipod as per internet suggestions. Would anyone know how to get my network reactivated. I am nervous to hit reset network settings in case I lose all my music and icons, etc. added since I got my Ipod. Thank you for any assistance

Do other devices now connect?
Did the iPod connect before?
What encryption/security is the router using?
Try:
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least ten seconds, until the Apple logo appears.
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- iOS: Recommended settings for Wi-Fi routers and access points
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iOS: How to back up
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Apple Retail Store - Genius Bar

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How to define a Bit Mask in Lab Windows.

Hello,
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Thanks fsitja.
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Where is the problem?
adresa de IP: 1**.27.1*4.6
netmask: 255.255.255.128
gateway: 1**.27.1*4.1
DNS1: 1**.2*1.2*2.1
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I have the common Leopard wifi problem:
4 computers, all linked to new Airport Extreme with 10.4
3 of 4 link with Leopard.
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Same with all linking machines.
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Hi ,
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I have already directly cross connected the Crio and have disabled the firewalls and still am not able to configure it.
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Regards
Abhinav

Dear Abhinav,
I'm sorry but what you are tryining to do is not suported by the Second Ethrnet Port on any cRIO and so you getting this error meeage.
Here a abstract out ouf the KnowledgeBase How do I Configure the Dual Ethernet Ports on Real-Time Controllers?:
Ethernet port 2 is currently not supported to communicate outside its own subnet. There is no capability of configuring the Default Gateway for Ethernet port 2 and therefore cannot connect to a large isolated intranet. However, there appears to be a common misconception that this port can only be used for communication between NI products: this is not the case, though any communication through the secondary port must be within the same subnet.
Kind Regards,
SG3 | Applications Engineering | National Instruments | NIG |

Defining VPN Subnet Mask?

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