External Network Change

[Patrick Nelson]

Bob Chiodini wrote:

>On Thu, 2005-07-28 at 13:19 -0700, Patrick Nelson wrote:
>  
>
>> > Bob Chiodini Wrote:
>> >
>> >Patrick Nelson wrote:
>> >> FC3 (all up to date)
>> >>
>> >> This may seem simple but I'm changing ISPs and I have 2 internet facing
>> >> systems that also connect to the private network.  One being the GW the
>> >> other being Mail.  So I have the gateway working fine but I can not get
>> >> the mail server working in the changed network config.  I just want to
>> >> make sure I'm not missing anything, because I think that the ISP is not
>> >> routing, switching, or configured correctly.
>> >>
>> >> -The two systems are attached to a Hub along with the connection to the
>> >> Internet.
>> >> -The gateway system is working fine with the new ISP changes (serves as
>> >> the DNS and GW)
>> >> -The mail server can be configured with the new ISP, but once I do that
>> >> system can not ping the internet
>> >> --however it can ping the internet side of the GW
>> >> --and the intranet.
>> >> -With ethereal I sniffed the mail server connection and it does appear
>> >> to get anthing back from the ISP GW
>> >>
>> >> Here are the changes that I make to mail server:
>> >>
>> >> 1. Use system-config-network to change the:
>> >>  -IP Address
>> >>  -Subnet Mask
>> >>  -Gateway
>> >> 2. Change the IPTables Firewall Script to match the new config
>> >> 3. Turn off the firewall script for the first booting in the new 
>>network
>> >> config
>> >> 4. Reboot
>> >>
>> >> The booting goes fine but I can not ping anything other than the GW
>> >> system on the Internet side.
>> >>
>> >> Is there anything that I'm missing or might try?  Or does this sound
>> >> like a routing problem on the side of my ISP?
>> >>
>> >
>> >Patrick,
>> >
>> >Post the output of ifconfig and route -n from both machines.  It sounds
>> >like the default gateway on the mail server is incorrect.
>> >
>> >Bob...
>>
>>Sorry for the delay I was out on a site.
>>
>>Here it is:
>>------------
>>- ifconfig -
>>------------
>>eth0      Link encap:Ethernet  HWaddr 00:60:B0:C3:D4:C1
>>          inet addr:206.58.200.39  Bcast:206.58.201.255  Mask:255.255.254.0
>>          inet6 addr: fe80::260:b0ff:fec3:d4c1/64 Scope:Link
>>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>>          RX packets:1136 errors:0 dropped:0 overruns:0 frame:0
>>          TX packets:492 errors:0 dropped:0 overruns:0 carrier:0
>>          collisions:0 txqueuelen:1000
>>          RX bytes:195090 (190.5 KiB)  TX bytes:37578 (36.6 KiB)
>>          Interrupt:9 Base address:0xece0
>>
>>eth1      Link encap:Ethernet  HWaddr 00:03:5D:07:C1:32
>>          inet addr:10.1.1.1  Bcast:10.1.255.255  Mask:255.255.0.0
>>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>>          RX packets:1310 errors:0 dropped:0 overruns:0 frame:0
>>          TX packets:1310 errors:3 dropped:0 overruns:0 carrier:0
>>          collisions:0 txqueuelen:1000
>>          RX bytes:655425 (640.0 KiB)  TX bytes:221435 (216.2 KiB)
>>          Interrupt:9 Base address:0x100
>>
>>lo        Link encap:Local Loopback
>>          inet addr:127.0.0.1  Mask:255.0.0.0
>>          inet6 addr: ::1/128 Scope:Host
>>          UP LOOPBACK RUNNING  MTU:16436  Metric:1
>>          RX packets:440 errors:0 dropped:0 overruns:0 frame:0
>>          TX packets:440 errors:0 dropped:0 overruns:0 carrier:0
>>          collisions:0 txqueuelen:0
>>          RX bytes:61126 (59.6 KiB)  TX bytes:61126 (59.6 KiB)
>>
>>------------
>>- route -n -
>>------------
>>Kernel IP routing table
>>Destination     Gateway         Genmask         Flags Metric Ref    Use 
>>Iface
>>206.58.200.0    0.0.0.0         255.255.254.0   U     0      0        0 eth0
>>10.1.0.0           0.0.0.0         255.255.0.0     U     0      0        
>>0 eth1
>>169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth1
>>0.0.0.0         206.58.200.1    0.0.0.0         UG    0      0        0 eth0
>>
>>Does anything here show a problem on my side rather than the ISP?  Thanks!
>>
>>
>>    
>>
>
>Patrick,
>
>Is this from the mail server?  What does the gateway look like?
>
>Can you ping 206.58.200.1?  Do you get your IP from your ISP via DHCP?
>The netmask is not natural for Class C.
>
>Bob...
>
>  
>
Yes it the info was from the mail server.  The GW had just about the 
same info but a .33 IP.  No, both the systems are static IPs.  The 
netmask was given by the ISP and is:

------------------------------------------------
           TCP/IP NETWORK INFORMATION
------------------------------------------------
IP Entered = ..................: 206.58.200.0
CIDR = ........................: /23
Netmask = .....................: 255.255.254.0
Wildcard Bits = ...............: 0.0.1.255
------------------------------------------------
Network Address = .............: 206.58.200.0
Broadcast Address = ...........: 206.58.201.255
Usable IP Addresses = .........: 510
First Usable IP Address = .....: 206.58.200.1
Last Usable IP Address = ......: 206.58.201.254