[rhelv6-beta-list] Problem with 2 interfaces on the same network with rh6 beta2

Thu Sep 2 16:07:36 UTC 2010

Hello,
trying to configure iSCSI against a Dell Equallogic I get some
problems in rh el 6 beta2 vs rh el 5.5

Only one network card at a time can reach another ip on the same lan.....

[root at testrh6 ~]# uname -r
2.6.32-44.2.el6.x86_64

This is the current situation
[root at testrh6 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth4
# Broadcom Corporation NetXtreme II BCM57711 10-Gigabit PCIe
DEVICE=eth4
HWADDR=00:10:18:58:E9:60
ONBOOT=yes
BOOTPROTO=static
TYPE=Ethernet
IPADDR=10.10.100.176
NETMASK=255.255.255.0
MTU=9000

[root at testrh6 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth5
# Broadcom Corporation NetXtreme II BCM57711 10-Gigabit PCIe
DEVICE=eth5
HWADDR=00:10:18:58:E9:62
ONBOOT=yes
BOOTPROTO=static
TYPE=Ethernet
IPADDR=10.10.100.177
NETMASK=255.255.255.0
MTU=9000

[root at testrh6 ~]# ifconfig eth4
eth4      Link encap:Ethernet  HWaddr 00:10:18:58:E9:60
          inet addr:10.10.100.176  Bcast:10.10.100.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
          RX packets:143662 errors:0 dropped:0 overruns:0 frame:0
          TX packets:141329 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:15799190 (15.0 MiB)  TX bytes:13294542 (12.6 MiB)
          Interrupt:40 Memory:dc800000-dcffffff

[root at testrh6 ~]# ifconfig eth5
eth5      Link encap:Ethernet  HWaddr 00:10:18:58:E9:62
          inet addr:10.10.100.177  Bcast:10.10.100.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
          RX packets:73053 errors:0 dropped:0 overruns:0 frame:0
          TX packets:157 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:7317830 (6.9 MiB)  TX bytes:12806 (12.5 KiB)
          Interrupt:50 Memory:dd800000-ddffffff

[root at testrh6 ~]# cat /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=testrh6
GATEWAY=10.4.5.250
NOZEROCONF=yes
NETWORKING_IPV6=no

In /etc/modprobe.d/local.conf
alias net-pf-10 off
#alias ipv6 off
options ipv6 disable=1

[root at testrh6 ~]# netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
10.4.5.0        0.0.0.0         255.255.255.0   U         0 0          0 bond0
10.10.100.0     0.0.0.0         255.255.255.0   U         0 0          0 eth4
10.10.100.0     0.0.0.0         255.255.255.0   U         0 0          0 eth5
0.0.0.0         10.4.5.250      0.0.0.0         UG        0 0          0 bond0

[root at testrh6 ~]# ping -I eth4 10.10.100.30
PING 10.10.100.30 (10.10.100.30) from 10.10.100.176 eth4: 56(84) bytes of data.
64 bytes from 10.10.100.30: icmp_seq=1 ttl=255 time=0.485 ms
64 bytes from 10.10.100.30: icmp_seq=2 ttl=255 time=0.101 ms
64 bytes from 10.10.100.30: icmp_seq=3 ttl=255 time=0.096 ms

[root at testrh6 ~]# ping -I eth5 10.10.100.30
PING 10.10.100.30 (10.10.100.30) from 10.10.100.177 eth5: 56(84) bytes of data.

No way with eth5....

now:
[root at testrh6 ~]# ifdown eth4
[root at testrh6 ~]# ping -I eth5 10.10.100.30
PING 10.10.100.30 (10.10.100.30) from 10.10.100.177 eth5: 56(84) bytes of data.
64 bytes from 10.10.100.30: icmp_seq=1 ttl=255 time=0.177 ms
64 bytes from 10.10.100.30: icmp_seq=2 ttl=255 time=0.079 ms
64 bytes from 10.10.100.30: icmp_seq=3 ttl=255 time=0.065 ms
^C
--- 10.10.100.30 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2171ms
rtt min/avg/max/mdev = 0.065/0.107/0.177/0.049 ms
[root at testrh6 ~]# ifup eth4
[root at testrh6 ~]# ping -I eth5 10.10.100.30
PING 10.10.100.30 (10.10.100.30) from 10.10.100.177 eth5: 56(84) bytes of data.
^C
--- 10.10.100.30 ping statistics ---
6 packets transmitted, 0 received, 100% packet loss, time 5324ms
no way...
[root at testrh6 ~]# ping -I eth4 10.10.100.30
PING 10.10.100.30 (10.10.100.30) from 10.10.100.176 eth4: 56(84) bytes of data.
64 bytes from 10.10.100.30: icmp_seq=1 ttl=255 time=0.112 ms
64 bytes from 10.10.100.30: icmp_seq=2 ttl=255 time=0.127 ms
64 bytes from 10.10.100.30: icmp_seq=3 ttl=255 time=0.130 ms

[root at testrh6 ~]# netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
10.4.5.0        0.0.0.0         255.255.255.0   U         0 0          0 bond0
10.10.100.0     0.0.0.0         255.255.255.0   U         0 0          0 eth5
10.10.100.0     0.0.0.0         255.255.255.0   U         0 0          0 eth4
0.0.0.0         10.4.5.250      0.0.0.0         UG        0 0          0 bond0

Any hint or any information on things changed between 5.5 and 6 that
could cause this?
I want to reach from both interfaces, so that I can establish iSCSI
connections and use multipath....

[root at testrh6 ~]# service ip6tables status
ip6tables: Firewall is not running.
[root at testrh6 ~]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num  target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
num  target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
num  target     prot opt source               destination

Thanks in advance,
Gianluca