Re: strange network problems

["Avery Pierce" <apierce camteq net>]

> eth1      Link encap:Ethernet  HWaddr 00:E0:29:95:60:60
>           inet addr:X.X.X.X  Bcast:255.255.255.255  Mask:255.255.255.0

>This looks like where your problem is, why does it have a /24 mask
>but an all-ones broadcast address?  It should be X.X.X.255 (where
>the X's refer to the inet address).
>
>If that public interface is configured via dhcp (eg, cable), then
>there could be a problem with your ISP's configuration (which would
>be unforgivable :-)

eth1 is configured for dhcp.  I know if I call them they will just tell me they dont support linux.
Heres some more info if it helps.  Thanks for your time.

here is a "ip -s a"

eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
link/ether 00:e0:29:1d:98:6e brd ff:ff:ff:ff:ff:ff
inet 192.168.200.1/24 brd 192.168.200.255 scope global eth0

eth1: <BROADCAST,NOTRAILERS,UP> mtu 1500 qdisc pfifo_fast qlen 100
link/ether 00:e0:29:95:60:60 brd ff:ff:ff:ff:ff:ff
inet x.x.x.x/24 brd 255.255.255.255 scope global eth1

Here is a "ip route"

24.53.194.0/24 dev eth1  proto kernel  scope link  src x.x.x.x
192.168.200.0/24 via 192.168.200.1 dev eth0  scope link
192.168.200.0/24 dev eth0  scope link
127.0.0.0/8 dev lo  scope link
default via 24.53.194.1 dev eth1

*********** REPLY SEPARATOR  ***********

On 10/30/2002 at 3:30 PM Tony Nugent wrote:

>On Tue Oct 29 2002 at 23:16, "Avery Pierce" wrote:
>
>> Im using a PII 350 with 2 SMC 1211TX Nics (realtek 8139).  Its
>> used for a firewall / NAT Gateway with 1 pc behind it.  If im
>> uploading a file on the firewall my pc behind the firewall had no
>> internet access on tiemouts.  I get heavy packet loss when I ping
>> an outside server..like google.com.  When uploading from my pc
>> through the firewall everything works just fine.  Downloading also
>> works fine .  Im logging all dropped packets with iptables and
>> nothing is behind dropped.  There isnt any errors in
>> /var/log/messages pertaining to the network interfaces.  ive tried
>> updating anything that might be causing this.
>
>(please wrap your text to make it readable, like I've just done).
>
>> System:
>> Redhat 7.2 Enigma
>> Kernel 2.4.18-17.x
>> Nic Driver 8139too
>> iptables 1.2.5-3
>> 
>> I connect to the internet with a SurfBoard sb4100 cablemodem through
>Adelphia.
>> My pc connects to the firewall using a crossover cable.  My pc has an
>smc 1211tx nic also.
>> Any ideas would be appreciated.  Thanks in advance.
>> 
>> Heres an ifconfig on the firewall
>
>/sbin/ifconfig is becoming obselete.  Use "/sbin/ip -s link" (and/or
>"ip -s a") to get a better output.
>
>
>> eth0      Link encap:Ethernet  HWaddr 00:E0:29:1D:98:6E
>>           inet addr:192.168.200.1  Bcast:192.168.200.255 
>Mask:255.255.255.0
>>           UP BROADCAST RUNNING MULTICAST  MTU:1500 Metric:1
>>           RX packets:35202 errors:6 dropped:0 overruns:0 frame:0
>
>(I'd check what is causing these errors if they persist).
>
>>           TX packets:24688 errors:0 dropped:0 overruns:0 carrier:0
>>           collisions:0 txqueuelen:100
>>           RX bytes:2402686 (2.2 Mb)  TX bytes:2912915 (2.7 Mb)
>>           Interrupt:5 Base address:0xc000
>> 
>> eth1      Link encap:Ethernet  HWaddr 00:E0:29:95:60:60
>>           inet addr:X.X.X.X  Bcast:255.255.255.255  Mask:255.255.255.0
>
>This looks like where your problem is, why does it have a /24 mask
>but an all-ones broadcast address?  It should be X.X.X.255 (where
>the X's refer to the inet address).
>
>What have you got in /etc/sysconfig/network-scripts/ifcfg-eth1 ?
>That interface doesn't seem to be configured right.
>
>If that public interface is configured via dhcp (eg, cable), then
>there could be a problem with your ISP's configuration (which would
>be unforgivable :-)
>
>>           UP BROADCAST NOTRAILERS RUNNING  MTU:1500  Metric:1
>>           RX packets:26893 errors:0 dropped:0 overruns:0 frame:0
>>           TX packets:35608 errors:0 dropped:0 overruns:0 carrier:0
>>           collisions:0 txqueuelen:100
>>          RX bytes:3045857 (2.9 Mb)  TX bytes:2968880 (2.8 Mb)
>>          Interrupt:10 Base address:0xe000
>
>Yeah, the itself card is working fine.
>
>The problem could be elsewhere (in your routing table, which you can
>see with "/sbin/ip route") or in your actual firewall rules (which
>you haven't shown here, but not likely to be the cause if some
>packets are getting through).
>
>But the bad 255.255.255.255 broadcast address needs to be fixed (if
>that is what it really showing up as).
>
>> Avery Pierce
>> Camteq Professional Systems
>> www.camteq.com
>
>Cheers
>Tony
>
>
>
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Avery Pierce
Camteq Professional Systems
www.camteq.com