External Network Change

[Bob Chiodini]

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...