[nycbug-talk] FreeBSD Dual homed

[Brian McGonigle]

Try lowering the MTU or disabling PMTU discovery. I have never seen PMTU
discovery work on FreeBSD. I always use a lower MTU when going over a WAN.

On Dec 20, 2007 4:24 PM, Rodrique Heron <swygue at gmail.com> wrote:

>
>
> Dan Langille wrote:
> > ... I think I misunderstood you in my original reply.
> >
> > Rodrique Heron wrote:
> >> Hello all-
> >>
> >> Are there any known issues when FreeBSD is dual homed.
> >
> > There may be issues, but I have run dual homed FreeBSD since 1998.
> >
> >
> >> I have two interfaces, each connected to a different subnet. Whenever
> >> both are enabled I can't get any incoming network traffic to the
> server.
> >
> > Can you elaborate upon this?  It's not clear what you are trying to do.
> >
> > So one NIC fails to work?  No traffic in or out?  Both nics?
> >
> > Output of netstat -na would help us understand.
> >
> > > I'm not
> >> routing between the two, therefore no "gateway_enable" in rc.conf. I
> >> don't have any firewalls enabled, I do have my defaultrouter set.
> >
> > I originally said:
> > AFAIK, you cannot route between the two UNLESS you have
> > gateway_enable="YES" in /etc/rc.conf.
> >
> > But what you mean is that you do not wish to route between the two
> > subnets. The FreeBSD box is not a gateway.  It is merely dual homed.
> >
> >
> >
> >
> Hope this helps-
>
>
> # sockstat -4
> root     sendmail   628   3  tcp4   127.0.0.1:25          *:*
> root     sshd       609   4  tcp4   *:22                  *:*
>
>
>
>
>
> # ifconfig -a
>
> em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>
>        options=b<RXCSUM,TXCSUM,VLAN_MTU>
>
>        inet 150.210.240.36 netmask 0xffffff00 broadcast 150.210.240.255
>
>        ether 00:14:22:23:1a:2e
>
>        media: Ethernet autoselect (1000baseTX <full-duplex>)
>
>        status: active
>
> em1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>
>        options=b<RXCSUM,TXCSUM,VLAN_MTU>
>
>        inet 150.210.160.243 netmask 0xffffff00 broadcast 150.210.160.255
>
>        ether 00:14:22:23:1a:2f
>
>        media: Ethernet autoselect (1000baseTX <full-duplex>)
>
>        status: active
>
> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
>
>        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
>
>        inet6 ::1 prefixlen 128
>
>        inet 127.0.0.1 netmask 0xff000000
>
>
>
>
>
> # arp -an
>
> ? (150.210.160.204) at 00:00:5e:00:01:04 on em1 [ethernet]
>
> ? (150.210.160.214) at 00:0b:db:90:73:1f on em1 [ethernet]
>
> ? (150.210.160.227) at 00:11:43:ef:ba:36 on em1 [ethernet]
>
> ? (150.210.160.254) at 00:00:0c:07:ac:04 on em1 [ethernet]
>
> ? (150.210.240.32) at 00:0c:29:62:78:63 on em0 [ethernet]
>
> ? (150.210.240.39) at 00:0c:29:f8:e7:2c on em0 [ethernet]
>
> ? (150.210.240.55) at 00:1a:64:24:ce:bc on em0 [ethernet]
>
>
>
>
>
> # netstat -rn -f inet
>
> Routing tables
>
>
>
> Internet:
>
> Destination        Gateway            Flags    Refs      Use  Netif Expire
>
> default            150.210.160.254    UGS         0      415    em1
>
> 127.0.0.1          127.0.0.1          UH          0        0    lo0
>
> 150.210.160/24     link#2             UC          0        0    em1
>
> 150.210.160.204    00:00:5e:00:01:04  UHLW        1       18    em1    552
>
> 150.210.160.214    00:0b:db:90:73:1f  UHLW        1        5    em1    654
>
> 150.210.160.227    00:11:43:ef:ba:36  UHLW        1        3    em1    747
>
> 150.210.160.254    00:00:0c:07:ac:04  UHLW        2        0    em1    547
>
> 150.210.240/24     link#1             UC          0        0    em0
>
> 150.210.240.32     00:0c:29:62:78:63  UHLW        1        6    em0    547
>
> 150.210.240.39     00:0c:29:f8:e7:2c  UHLW        1       12    em0    547
>
> 150.210.240.55     00:1a:64:24:ce:bc  UHLW        1        8    em0    743
>
>
>
>
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