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[SOLVED]Can't ping/ssh FreeBSD from Gentoo.
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alexcortes
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PostPosted: Mon Jul 11, 2016 4:16 pm    Post subject: [SOLVED]Can't ping/ssh FreeBSD from Gentoo. Reply with quote

Hello fellows!

I just installed FreeBSD (192.168.0.254) on a small server and I can't ping/ssh it from my Gentoo (192.168.0.10) box. Basically I can ping/ssh from anything to anything on the network, including from FreeBSD to Gentoo, but not from Gentoo to FreeBSD. :evil:

Any idea?

Thanks!

EDIT: I can ping/ssh when using wireless on Gentoo but not wired.

Router Problem


Last edited by alexcortes on Tue Jul 12, 2016 6:59 pm; edited 1 time in total
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szatox
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PostPosted: Mon Jul 11, 2016 4:34 pm    Post subject: Reply with quote

1) firewall
2) routing (on both boxes. And I mean both, IP pools and metrics)

Also, loops in your network can cause really funny behaviour. Sometimes it's way more complicated than a packet storm shutting down the whole segment.
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alexcortes
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PostPosted: Mon Jul 11, 2016 5:05 pm    Post subject: Reply with quote

Gentoo:

Code:
*nat
:PREROUTING ACCEPT [666283:91738361]
:INPUT ACCEPT [2584:390451]
:OUTPUT ACCEPT [1829537:201284060]
:POSTROUTING ACCEPT [1829797:201294460]
COMMIT
# Completed on Mon Jul 11 13:56:24 2016
# Generated by iptables-save v1.6.0 on Mon Jul 11 13:56:24 2016
*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [2519258:210884412]
:TCP - [0:0]
:UDP - [0:0]
-A INPUT -i lo -j ACCEPT
-A INPUT -m conntrack --ctstate INVALID -j DROP
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type 8 -m conntrack --ctstate NEW -j ACCEPT
-A INPUT -p udp -m conntrack --ctstate NEW -j UDP
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -m conntrack --ctstate NEW -j TCP
-A INPUT -p udp -j REJECT --reject-with icmp-port-unreachable
-A INPUT -p tcp -j REJECT --reject-with tcp-reset
-A INPUT -j REJECT --reject-with icmp-proto-unreachable
-A OUTPUT -p icmp -m conntrack --ctstate INVALID -j DROP
-A TCP -s 192.168.0.0/24 -p tcp -m tcp --dport 22000 -j ACCEPT
-A TCP -p tcp -m tcp --dport 6880 -j ACCEPT
-A TCP -s 192.168.0.0/24 -p tcp -m tcp --dport 1714:1764 -j ACCEPT
-A TCP -s 192.168.0.0/24 -p tcp -m tcp --dport 6600 -j ACCEPT
-A UDP -s 192.168.0.0/24 -p udp -m udp --dport 1714:1764 -j ACCEPT
COMMIT


Code:
eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.10  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::1260:4bff:fe46:a51f  prefixlen 64  scopeid 0x20<link>
        ether 10:60:4b:46:a5:1f  txqueuelen 1000  (Ethernet)
        RX packets 210251  bytes 83956703 (80.0 MiB)
        RX errors 0  dropped 134  overruns 0  frame 0
        TX packets 161685  bytes 13611674 (12.9 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


FreeBSD (does not have a firewall up yet):

Code:
rl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=2008<VLAN_MTU,WOL_MAGIC>
        ether 00:e0:09:06:7d:44
        inet 192.168.0.254 netmask 0xffffff00 broadcast 192.168.0.255
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active


Router (DD-WRT)

Code:
Link encap:Ethernet  HWaddr E8:94:F6:2E:52:20 
          inet addr:192.168.0.1  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:21819 errors:0 dropped:147 overruns:0 frame:0
          TX packets:20447 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:4289787 (4.0 MiB)  TX bytes:12000573 (11.4 MiB)


EDIT:

Gentoo Wireless (works)

Code:
wlo1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.5  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::678b:3242:9ec7:d757  prefixlen 64  scopeid 0x20<link>
        ether 40:2c:f4:34:67:71  txqueuelen 1000  (Ethernet)
        RX packets 7794  bytes 3500904 (3.3 MiB)
        RX errors 0  dropped 0  overruns 0  frame 25533
        TX packets 8318  bytes 1112297 (1.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 16
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Syl20
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PostPosted: Tue Jul 12, 2016 1:31 pm    Post subject: Reply with quote

netstat -rn (two distinct interfaces in the same network may cause routing problems) ?
Did you try tcpdump to monitor the network traffic between both boxes ?
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alexcortes
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PostPosted: Tue Jul 12, 2016 3:27 pm    Post subject: Reply with quote

Gentoo

Code:
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.0.1     0.0.0.0         UG        0 0          0 eno1
127.0.0.0       0.0.0.0         255.0.0.0       U         0 0          0 lo
192.168.0.0     0.0.0.0         255.255.255.0   U         0 0          0 eno1


FreeBSD

Code:
Routing tables                                                                                                                                                                 
                                                                                                                                                                               
Internet:                                                                                                                                                                     
Destination        Gateway            Flags      Netif Expire                                                                                                                 
default            192.168.0.1        UGS         rl0                                                                                                                         
127.0.0.1          link#3             UH          lo0                                                                                                                         
192.168.0.0/24     link#2             U           rl0                                                                                                                         
192.168.0.254      link#2             UHS         lo0                                                                                                                         
                                                                                                                                                                               
Internet6:                                                                                                                                                                     
Destination                       Gateway                       Flags      Netif Expire                                                                                       
::/96                             ::1                           UGRS        lo0                                                                                               
::1                               link#3                        UH          lo0
::ffff:0.0.0.0/96                 ::1                           UGRS        lo0
fe80::/10                         ::1                           UGRS        lo0
fe80::%lo0/64                     link#3                        U           lo0
fe80::1%lo0                       link#3                        UHS         lo0
ff01::%lo0/32                     ::1                           U           lo0
ff02::/16                         ::1                           UGRS        lo0
ff02::%lo0/32                     ::1                           U           lo0


Code:
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
xxx.xx.xx.x     0.0.0.0         255.255.224.0   U         0 0          0 eth0
127.0.0.0       0.0.0.0         255.0.0.0       U         0 0          0 lo
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 br0
192.168.0.0     0.0.0.0         255.255.255.0   U         0 0          0 br0


I will try tcpdump later.
I think I have a wireless card sitting here and I will try with it to see if this issue is hardware related.
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alexcortes
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PostPosted: Tue Jul 12, 2016 5:08 pm    Post subject: Reply with quote

I do not have how to properly tcpdump the FreeBSD box right now because there are no display attached on it.

From Gentoo using wireless:

Code:
13:59:04.654560 IP 192.168.0.5 > 192.168.0.254: ICMP echo request, id 4122, seq 39, length 64


From Gentoo using wired:

Code:
14:04:23.419000 ARP, Request who-has 192.168.0.254 tell 192.168.0.10, length 28



I can't tcpdump from router.

Thanks.
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alexcortes
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PostPosted: Tue Jul 12, 2016 7:00 pm    Post subject: Reply with quote

I change the router for another one a and that did the trick. 8)

Thank you!
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