Issues related to configuring your network
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hack3rcon
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by hack3rcon » 2018/11/28 12:16:35
Hello.
I'm using CentOS 7 x86_64 and I used "nmtui" for adding two IP addresses manually. I add "192.168.1.2" for the first IP and "X" for the second IP. I removed the second IP and used "systemctl restart network" but I can ping "X" IP!!! I restarted my system too but the problem exist.
Code: Select all
$ ifconfig
eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.2 netmask 255.255.255.255 broadcast 192.168.1.1
inet6 fe80::1602:ecff:fe04:56ac prefixlen 64 scopeid 0x20<link>
ether 14:02:ec:04:56:ac txqueuelen 1000 (Ethernet)
RX packets 32740 bytes 2720191 (2.5 MiB)
RX errors 0 dropped 2 overruns 0 frame 0
TX packets 1753 bytes 425043 (415.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 16
How can I solve it?
Thank you.
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avij
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by avij » 2018/11/28 14:16:09
Maybe that X is used elsewhere in your network, and you are actually pinging some other host?
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TrevorH
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by TrevorH » 2018/11/28 15:58:12
Also ifconfig is deprecated, in part because it doesn't show all ip addresses assigned to an interface. Use ip a sh instead.
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hack3rcon
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by hack3rcon » 2018/11/29 09:01:26
avij wrote: ↑2018/11/28 14:16:09
Maybe that X is used elsewhere in your network, and you are actually pinging some other host?
No, when I disable the NIC then I can't ping the second IP.
Linux has any cache like Windows OS?
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hack3rcon
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by hack3rcon » 2018/11/29 09:02:20
TrevorH wrote: ↑2018/11/28 15:58:12
Also ifconfig is deprecated, in part because it doesn't show all ip addresses assigned to an interface. Use
ip a sh instead.
I will post the output.
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hack3rcon
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Post
by hack3rcon » 2018/12/01 05:35:39
TrevorH wrote: ↑2018/11/28 15:58:12
Also ifconfig is deprecated, in part because it doesn't show all ip addresses assigned to an interface. Use
ip a sh instead.
The output is:
Code: Select all
$ ip a sh
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 14:02:ec:04:56:ac brd ff:ff:ff:ff:ff:ff
inet 192.168.1.2/32 brd 192.168.1.2 scope global noprefixroute eno1
valid_lft forever preferred_lft forever
inet 255.255.0.0/32 brd 255.255.0.0 scope global noprefixroute eno1
valid_lft forever preferred_lft forever
inet6 fe80::1602:ecff:fe04:56ac/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: eno2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 14:02:ec:04:56:ad brd ff:ff:ff:ff:ff:ff
4: eno3: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 14:02:ec:04:56:ae brd ff:ff:ff:ff:ff:ff
5: eno4: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 14:02:ec:04:56:af brd ff:ff:ff:ff:ff:ff
6: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
link/ether 52:54:00:20:45:af brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
7: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel master virbr0 state DOWN group default qlen 1000
link/ether 52:54:00:20:45:af brd ff:ff:ff:ff:ff:ff
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hack3rcon
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Post
by hack3rcon » 2018/12/01 05:39:26
jlehtone wrote: ↑2018/11/29 09:40:08
Other commands:
The output is:
Code: Select all
$ nmcli con sh
NAME UUID TYPE DEVICE
eno1 d7c500b0-859d-491d-bc0c-76092bacbd86 ethernet eno1
virbr0 7704e08e-5615-4808-9093-6533dcece0f8 bridge virbr0
eno2 0d63a231-266c-43e3-a2b7-dd65eca3be01 ethernet --
eno3 d53b682c-5567-4937-b04c-2a417d9e7728 ethernet --
eno4 ec143a63-8765-4b38-a873-aefae2d10c95 ethernet --
$ nmcli
eno1: connected to eno1
"Broadcom Limited NetXtreme BCM5719 Gigabit Ethernet PCIe (Ethernet 1Gb 4-port 331i Adapter)"
ethernet (tg3), 14:02:EC:04:56:AC, hw, mtu 1500
ip4 default
inet4 192.168.1.2/32
inet4 255.255.0.0/32
route4 192.168.1.2/32
route4 255.255.0.0/32
route4 192.168.1.1/32
route4 0.0.0.0/0
inet6 fe80::1602:ecff:fe04:56ac/64
route6 ff00::/8
route6 fe80::/64
route6 fe80::/64
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TrevorH
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Post
by TrevorH » 2018/12/01 15:24:36
An ip address of 255.255.0.0? Really? Are you sure that's not a typo and is meant to be a netmask?