[Firehol-support] Link Balancer - no routing
Christopher Howard
christopher at alaskasi.com
Wed Jul 5 23:49:20 BST 2017
Seems like I must be doing some wrong with the masquerading. I can see
with tcpdump that if I send either icmp or https packets, that the
packets are making it out the wan interface, but no responses are coming
back. E.g.:
# tcpdump -i enp1s0
icmp
tcpdump: verbose output suppressed, use -v or -vv for full protocol
decode
listening on enp1s0, link-type EN10MB (Ethernet), capture size 262144
bytes
14:45:32.552723 IP 192.168.235.100 > google-public-dns-a.google.com:
ICMP echo request, id 2764, seq 1, length 64
# tcpdump -i enp1s0 tcp port
https
tcpdump: verbose output suppressed, use -v or -vv for full protocol
decode
listening on enp1s0, link-type EN10MB (Ethernet), capture size 262144
bytes
14:46:49.473220 IP 192.168.235.100.37695 >
sea15s11-in-f14.1e100.net.https: Flags [S], seq 2536058409, win 29200,
options [mss 1460,sackOK,TS val 5325619 ecr
0,nop,wscale 7], length 0
On the other hand, if I send the requests from inside the router itself,
replies come back immediately.
On Wed, 2017-07-05 at 13:51 -0800, Christopher Howard wrote:
> Ack! Nevermind, I was accidentally pinging the interface address :(
>
>
> On Wed, 2017-07-05 at 13:15 -0800, Christopher Howard wrote:
> > I figured it out! After I set
> >
> > net.ipv4.conf.all.accept_source_route = 1
> >
> > it started working!
> >
> > On Wed, 2017-07-05 at 12:56 -0800, Christopher Howard wrote:
> > > Thank you! Is there more to it than adding "masquerade" to the router
> > > definition? I did
> > >
> > > file:/etc/firehol/firehol.conf
> > > ---------
> > > <snip>
> > > router lan12wan1 inface enp2s0 outface enp1s0
> > > masquerade
> > > server all accept
> > >
> > > router lan12wan2 inface enp2s0 outface enp3s0
> > > masquerade
> > > server all accept
> > > <snip>
> > > --------
> > >
> > > and restarted everything but nothing seems to have changed. Thank you
> > > for your help.
> > >
> > > On Wed, 2017-07-05 at 22:49 +0300, Tsaousis, Costa wrote:
> > > > Hi,
> > > >
> > > >
> > > > I think you have forgotten to NAT (snat or masquerade) LAN IPs to the
> > > > internet interfaces, so the LAN host are sent to the internet with
> > > > private IPs.
> > > >
> > > >
> > > > Costa
> > > >
> > > >
> > > >
> > > > On Wed, Jul 5, 2017 at 9:42 PM, Christopher Howard
> > > > <christopher at alaskasi.com> wrote:
> > > > Hi, I am trying to set up a link balancer. I didn't know
> > > > Firehol /
> > > > link-balancer existed until about two days ago, so be patient
> > > > with me. I
> > > > have things configured so it seems like default route(s) are
> > > > showing up.
> > > > When logged into the router, I can ping the Internet fine.
> > > > However, from
> > > > device connected to the LAN port, I receive IP address, and
> > > > default
> > > > route (to link balancer) is showing, but the device cannot
> > > > ping the
> > > > Internet. Presumably it is some problem with the way I have
> > > > (or haven't)
> > > > configured routing.
> > > >
> > > > On balancer box, I have:
> > > >
> > > > file:/etc/network/interfaces
> > > > --------
> > > > # This file describes the network interfaces available on your
> > > > system
> > > > # and how to activate them. For more information, see
> > > > interfaces(5).G!
> > > >
> > > > source /etc/network/interfaces.d/*
> > > >
> > > > # The loopback network interfacen stopped. Policy is ACCEPT
> > > > EVERYTHING!
> > > > auto lo
> > > > iface lo inet loopback
> > > >
> > > > # WAN1 - Left most port
> > > > allow-hotplug enp1s0
> > > > iface enp1s0 inet dhcp
> > > >
> > > > # WAN2 - 2nd from left
> > > > allow-hotplug enp3s0
> > > > iface enp3s0 inet dhcp
> > > >
> > > > # WAN3 - 3rd from left
> > > > allow-hotplug enp4s0
> > > > iface enp4s0 inet dhcp
> > > >
> > > > # LAN1 - 4th from left
> > > > allow-hotplug enp2s0
> > > > iface enp2s0 inet static
> > > > address 192.168.235.1
> > > > netmask 255.255.255.0
> > > > broadcast 192.168.235.255
> > > > network 192.168.235.0
> > > > --------
> > > >
> > > > file:/etc/firehol/firehol.conf
> > > > --------
> > > > interface any world
> > > > client all accept
> > > > server all accept
> > > >
> > > > connmark 0x1 interface enp1s0
> > > > connmark 0x2 interface enp3s0
> > > >
> > > > router lan12wan1 inface enp2s0 outface enp1s0
> > > > server all accept
> > > >
> > > > router lan12wan2 inface enp2s0 outface enp3s0
> > > > server all accept
> > > > --------
> > > >
> > > > file:/etc/firehol/link-balancer.conf
> > > > --------
> > > > LB_DEFAULT_IPV="4"
> > > >
> > > > gateway cable dev enp1s0 gw 192.168.1.1
> > > > gateway sat1 dev ensp3s0 gw 192.168.0.1 check 66.82.4.8
> > > >
> > > > table 1
> > > > default via cable
> > > >
> > > > table 2
> > > > default via sat1
> > > >
> > > > table main
> > > > default via cable weight 150
> > > > default via sat1 weight 50
> > > >
> > > > policy
> > > > connmark 0x1 table 1
> > > > connmark 0x2 table 2
> > > > --------
> > > >
> > > > Also on balancer box I see:
> > > >
> > > > #
> > > > cat /proc/sys/net/ipv4/ip_forward
> > > > 1
> > > >
> > > > # ip
> > > > route
> > > > default via 192.168.1.1 dev
> > > > enp1s0
> > > > 192.168.0.0/24 dev enp3s0 proto kernel scope link src
> > > > 192.168.0.5
> > > > 192.168.1.0/24 dev enp1s0 proto kernel scope link src
> > > > 192.168.1.12
> > > > 192.168.235.0/24 dev enp2s0 proto kernel scope link src
> > > > 192.168.235.1
> > > >
> > > > (For testing sat1 link is currently down.)
> > > >
> > > > Have I forgot/misconfigured anything obvious?
> > > >
> > > > --
> > > > Christopher Howard
> > > > Computer Assistant
> > > > Alaska Satellite Internet
> > > > 3239 La Ree Way
> > > > Fairbanks, Alaska 99709
> > > > 1-888-396-5623
> > > > https://alaskasatelliteinternet.com
> > > > personal web site: https://qlfiles.net
> > > >
> > > >
> > > >
> > > > _______________________________________________
> > > > Firehol-support mailing list
> > > > Firehol-support at lists.firehol.org
> > > > http://lists.firehol.org/mailman/listinfo/firehol-support
> > > >
> > > >
> > >
> >
>
--
Christopher Howard
Computer Assistant
Alaska Satellite Internet
3239 La Ree Way
Fairbanks, Alaska 99709
1-888-396-5623
https://alaskasatelliteinternet.com
personal web site: https://qlfiles.net
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