Troubleshooting XP <-> Fedora 2 crossover cable connection.

Hi,

I have two machines with following eth configs:

Win XP Prof (no SP2):
IP: 192.168.0.10
Subnet mask: 255.255.255.0
No gateway
No DNS

Fedora Core2:
IP: 192.168.0.11
Subnet mask: 255.255.255.0
No gateway
No DNS
ip_forward=1

I can ping only from fedora, unable to ping from XP.

1. I havn't checked with another crossover cable since I can ping one
way. Would be a good idea to check another cable?

Pls share ur thoughts abt how I cud proceed with the troubleshooting. I
tried to search groups for other such incidents but did't come across
any. If there are/is any pls indicate.

Thanks,
Manas

In comp.os.linux.networking Manas Ranade <(E-Mail Removed)>:
> Hi,

> I have two machines with following eth configs:

> Win XP Prof (no SP2):
> IP: 192.168.0.10
> Subnet mask: 255.255.255.0
> No gateway
> No DNS

> Fedora Core2:
> IP: 192.168.0.11
> Subnet mask: 255.255.255.0
> No gateway
> No DNS
> ip_forward=1

> I can ping only from fedora, unable to ping from XP.

> 1. I havn't checked with another crossover cable since I can ping one
> way. Would be a good idea to check another cable?

If one way works, the other should be OK, since packets are
already going in both directions.

One reason might be you enabled firewalling on the fedora box,
which could disable ICMP echo requests. Try disabling the firewall
and retry.

[..]

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#bofh excuse 153: Big to little endian conversion error

I did not find ipfwadm on the machine, whereis did not return anything.
Also system-config-securitylevel shows firewall disabled.
Do I need to recompile the kernel aftr setting ip_forward to 1?
Right now I've just set it in /etc/sysctl.conf and
/etc/sysconfig/network

Manas

In comp.os.linux.networking Manas Ranade <(E-Mail Removed)>:
> I did not find ipfwadm on the machine, whereis did not return anything.
> Also system-config-securitylevel shows firewall disabled.

There's no ipfwadm with FC2, firewall with kernel 2.4/2.6 is
called iptables, you can check for rules if any 'iptables -L'
('man iptables').

Should be per default controlled through:

/etc/init.d/iptables
Usage: /etc/init.d/iptables {start|stop|restart|condrestart|status|panic|save}


> Do I need to recompile the kernel aftr setting ip_forward to 1?

No, you don't even need to reboot to switch ip_forward on but
it's unrelated to your problem, since you just want to ping from
one host to another.

What does the following output:
cat /proc/sys/net/ipv4/icmp_echo_ignore_all

> Right now I've just set it in /etc/sysctl.conf and
> /etc/sysconfig/network

Sounds fine, but show us what you did exactly, if unsure.

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iptables -L output is:

[root@man-machine manas]# /sbin/iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination

Chain FORWARD (policy ACCEPT)
target prot opt source destination

Chain OUTPUT (policy ACCEPT)
target prot opt source destination

cat /proc/sys/net/ipv4/icmp_echo_ignore_all is displaying 0

/etc/sysctl.conf looks like:
# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls IP packet forwarding
net.ipv4.ip_forward = 1
net.ipv4.ip_always_defrag = 1

# Controls source route verification
net.ipv4.conf.default.rp_filter = 0

# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1

kernel.sem=100 32000 100 100
kernel.shmmax=2147483648
kernel.shmmni=4096
kernel.shmall=2097152
kernel.shmmin=1
net.ipv4.ip_local_port_range=1024 65000

/etc/sysconfig/network looks like:
NETWORKING=yes
FORWARD_IPV4=yes
HOSTNAME=man-machine

service stop iptables did the trick!
now I can ping both ways.
thanks a lot,
Manas

Manas Ranade wrote:
> iptables -L output is:
>
> [root@man-machine manas]# /sbin/iptables -L
> Chain INPUT (policy ACCEPT)
> target prot opt source destination
>
> Chain FORWARD (policy ACCEPT)
> target prot opt source destination
>
> Chain OUTPUT (policy ACCEPT)
> target prot opt source destination
>
> cat /proc/sys/net/ipv4/icmp_echo_ignore_all is displaying 0
>
> /etc/sysctl.conf looks like:
> # Kernel sysctl configuration file for Red Hat Linux
> #
> # For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and
> # sysctl.conf(5) for more details.
>
> # Controls IP packet forwarding
> net.ipv4.ip_forward = 1
> net.ipv4.ip_always_defrag = 1
>
> # Controls source route verification
> net.ipv4.conf.default.rp_filter = 0
>
> # Controls the System Request debugging functionality of the kernel
> kernel.sysrq = 0
>
> # Controls whether core dumps will append the PID to the core
filename.
> # Useful for debugging multi-threaded applications.
> kernel.core_uses_pid = 1
>
> kernel.sem=100 32000 100 100
> kernel.shmmax=2147483648
> kernel.shmmni=4096
> kernel.shmall=2097152
> kernel.shmmin=1
> net.ipv4.ip_local_port_range=1024 65000
>
> /etc/sysconfig/network looks like:
> NETWORKING=yes
> FORWARD_IPV4=yes
> HOSTNAME=man-machine