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two persistent routes

Posted on 2014-10-15
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Last Modified: 2014-10-28
Hello experts
in may workstations and server i have seen two Persistent Routes:
i have one gateway and i don't know why i have two persistent routes"
i have deleted the routes and then add new one. after it show one. but it is in my all corporate network workstations and server. i don't know where from it? and what can i correct it?
what bad reasons can it bring ?
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Question by:ameriaadmin
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by:Kimputer
Kimputer earned 250 total points
ID: 40381858
When correctly used, persistent routes are for selected specific internal resources (route it through another router, like a VPN or leased line), or if it needs to bypass some security features (route through another router that doesn't have a filtering system).
What you can check of course, does this route even work? (tracert to this speical IP, can you even ping that gateway?) If it doesn't work, delete it. If it does work, find out who put it there for what reason.
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by:Zacharia Kurian
Zacharia Kurian earned 250 total points
ID: 40381886
Well,  persistent routes are sometimes added to servers like exchange for specific reasons. Hope the  deletion was not done  on your exchange server. When you find any persistent routes in any of the server, you have to make sure that your corporate network doesn't use those routes for any specific reasons. Have you consulted your Network Admins / referred your IT manuals? Usually  we find a last resort route as persistent in PCs & servers to by pass traffic to Fire Walls.
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by:ameriaadmin
ID: 40381993
in my corporate i dont use second persistent route. we not add it and we dont need it. it is in lan area, there are not vpns. it is not added manually.
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by:Zacharia Kurian
ID: 40382055
Can you mention those persistent routes? (only if it is not against your IT policy)
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by:ameriaadmin
ID: 40383635
in routing table mast be only one persistent route
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by:Kimputer
ID: 40383805
For normal operation, a PC/server/whatever DOES NOT NEED a persistent route. Only the default gateway is necessary, which doesn't show up as a persistent route.
As you mentioned, you don't need a persistent route for VPN services or whatever, so this persistent route can be deleted. Just write down and log this info, just in case you missed something and you need to add it back.
Anyway, you have conflicting posts, one saying you must have one persistent route, and one where you say you don't need any. Which one is it?
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by:ameriaadmin
ID: 40383896
i have configure the default gw. does it the same?
i dont need second persistent route.
i can manually delete them, but i want to know from where it comes? and what result ?
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by:Kimputer
ID: 40383903
Default gateway is the only thing you need. It's hard to tell where it comes from. The results depends, it might not have even worked at all (you can post the routes here before deleting it though, if you like).
Again, the command "route print" should have a this as result (for any normal connection):
Persistent Routes:
  None
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by:ameriaadmin
ID: 40384008
in this example there is one network interface.

PS C:\Windows\system32> route print

===========================================================================

Interface List

15...00 15 5d c8 3d 39 ......Microsoft Hyper-V Network Adapter #3

  1...........................Software Loopback Interface 1

13...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter

===========================================================================

 

IPv4 Route Table

===========================================================================

Active Routes:

Network Destination        Netmask          Gateway       Interface  Metric

          0.0.0.0          0.0.0.0    192.168.200.1   192.168.200.77    261

        127.0.0.0        255.0.0.0         On-link         127.0.0.1    306

        127.0.0.1  255.255.255.255         On-link         127.0.0.1    306

  127.255.255.255  255.255.255.255         On-link         127.0.0.1    306

    192.168.200.0    255.255.255.0         On-link    192.168.200.77    261

   192.168.200.77  255.255.255.255         On-link    192.168.200.77    261

  192.168.200.255  255.255.255.255         On-link    192.168.200.77    261

        224.0.0.0        240.0.0.0         On-link         127.0.0.1    306

        224.0.0.0        240.0.0.0         On-link    192.168.200.77    261

  255.255.255.255  255.255.255.255         On-link         127.0.0.1    306

  255.255.255.255  255.255.255.255         On-link    192.168.200.77    261

===========================================================================

Persistent Routes:

  Network Address          Netmask  Gateway Address  Metric

          0.0.0.0          0.0.0.0    192.168.200.1  Default

          0.0.0.0          0.0.0.0    192.168.200.1  Default

===========================================================================

 

IPv6 Route Table

===========================================================================

Active Routes:

If Metric Network Destination      Gateway

  1    306 ::1/128                  On-link

  1    306 ff00::/8                 On-link

===========================================================================

Persistent Routes:

  None

PS C:\Windows\system32>
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by:Kimputer
ID: 40384994
The persistent route isn't anything more than declaring the default gateway (AGAIN, as it is always already set in the TCP/IP settings). So just ignore it.
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by:ameriaadmin
ID: 40394195
I can't ignore it, because I don't know the reasons why it happens.
Some servers has double persistent routes o GW address, but what's very strange, some servers has persistent route to network that is not connected to the server.

Example
Server IP - 192.168.8.13
GW - 192.168.8.1

Persistent Routes:
   Network Address          Netmask  Gateway Address  Metric
           0.0.0.0          0.0.0.0    192.168.8.1  Default
           0.0.0.0          0.0.0.0    192.168.99.1  Default
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by:Kimputer
ID: 40394718
I said ignore it, because your examples up till then were fine as it is. Only in the last post did you post something different.
In this case, just delete both routes. I already said you should delete it in previous posts. I also said you don't need a persistent route if you don't use special network functions. As you can see, it tries to be a default gateway which doesn't make any sense, even if that extra gateway was working (if it was functional, it would be a smaller IP range to forward to that extra gateway). I only said ignore it, because it didn't matter in the previous example, and because you keep asking after I said delete a few times.
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by:Zacharia Kurian
ID: 40396183
Will it be wise to check your VLAN settings in your core switches for some clues? If you haven't checked the settings in your core switches, I would suggest you to check it out. Also have a look into your entire network diagrams and I believe there should be such kind of diagrams with your IT. Once you go through all these, I am sure you will find the answers by yourself.

With out any details of your network setup, I do not think any one would be able to give you a definite answer.
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Author Comment

by:ameriaadmin
ID: 40396343
The first example that I posted is not fine, as you can see there were two persistent routes for same network on the same IP and with same metric. The second example is similar situation, but with different IPs. And it is not important how many network cards are installed on the server/ws. Just one connected network interface has configured only one gateway. This dual route presents not on all servers/ws.
I have already deleted all persistent routes and set gateway manually.

I haven't check any settings on core switches. I'll check.
It is interesting how core switches can add routes on servers/ws.

I just want do understand - how this routes appear in route table? Can it be from some software or network wrong configuration?
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by:Kimputer
ID: 40396922
I said it's "fine" as in, it doesn't interfere with your settings (it's just double, saying the same things). The second example is definitely not "fine", as it might interfere with the normal gateway settings.

As you already explained many times, you don't use any special networking, so my recommendation from the very start still stands, have the gateway in the TCP IP settings, and remove persistent routes.

Core switches cannot add routes to your computer or server. It has to be done manually, or a script/program must have been run with administrator rights.
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ameriaadmin earned 0 total points
ID: 40401077
it comes from icmp redirect futere
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by:ameriaadmin
ID: 40408032
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