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More updates to the Multi-ISP doc

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Signed-off-by: Tom Eastep <teastep@shorewall.net>
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Tom Eastep 2012-10-28 12:10:06 -07:00
parent 19048b6a18
commit 9e984b10f6
3 changed files with 182 additions and 43 deletions
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225
docs/MultiISP.xml
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@ -2369,19 +2369,22 @@ wlan0 192.168.0.0/24</programlisting><note>
<graphic fileref="images/Network2012a.png"/>
<para>The Business Gateway manages a gigabit local network with address
10.1.10.1/24. So The firewall is given address 10.1.10.11/24 and the
gateway is configured to route the public IP block via that address. The
gateway's firewall is only enabled for the 10.1.10/0/24 network.</para>
<section>
<title>IPv4 Configuration</title>
<para>Because the business network is faster and more reliable, the
configuration favors sending local network traffic via that uplink rather
than the consumer line.</para>
<para>The Business Gateway manages a gigabit local network with address
10.0.1.1/24. So The firewall is given address 10.0.1.11/24 and the
gateway is configured to route the public IP block via that address. The
gateway's firewall is only enabled for the 10.0.1.0/24 network.</para>
<para>Here are the key entries in
<filename>/etc/shorewall/params</filename>:</para>
<para>Because the business network is faster and more reliable, the
configuration favors sending local network traffic via that uplink
rather than the consumer line.</para>
<programlisting>LOG=NFLOG
<para>Here are the key entries in
<filename>/etc/shorewall/params</filename>:</para>
<programlisting>LOG=NFLOG
INT_IF=eth2
TUN_IF=tun+
@ -2394,13 +2397,13 @@ FALLBACK=
PROXYDMZ=
SQUID2=</programlisting>
<para>The last three variables are used to configure the firewall
differently to exercise various Shorewall features.</para>
<para>The last three variables are used to configure the firewall
differently to exercise various Shorewall features.</para>
<para>Here are the key entries in
<filename>/etc/shorewall/shorewall.conf</filename>:</para>
<para>Here are the key entries in
<filename>/etc/shorewall/shorewall.conf</filename>:</para>
<programlisting>###############################################################################
<programlisting>###############################################################################
# F I R E W A L L O P T I O N S
###############################################################################
@ -2424,7 +2427,7 @@ FASTACCEPT=No
..
<emphasis role="bold">KEEP_RT_TABLES=Yes</emphasis>
<emphasis role="bold">KEEP_RT_TABLES=Yes</emphasis> #This is necessary when both IPv4 and IPv6 Multi-ISP are used
LEGACY_FASTSTART=Yes
@ -2484,21 +2487,21 @@ MASK_BITS=8
ZONE_BITS=0</programlisting>
<para>I use USE_DEFAULT_RT=Yes and since there are only two providers, two
provider bits are all that are required.</para>
<para>I use USE_DEFAULT_RT=Yes and since there are only two providers,
two provider bits are all that are required.</para>
<para>Here is /etc/shorewall/zones:</para>
<para>Here is /etc/shorewall/zones:</para>
<programlisting>fw firewall
<programlisting>fw firewall
loc ip #Local Zone
net ip #Internet
smc:net ip #10.0.1.0/24
vpn ip #OpenVPN clients
dmz ip #LXC Containers</programlisting>
<para><filename>/etc/shorewall/interfaces</filename>:</para>
<para><filename>/etc/shorewall/interfaces</filename>:</para>
<programlisting>#ZONE INTERFACE OPTIONS
<programlisting>#ZONE INTERFACE OPTIONS
loc INT_IF dhcp,physical=$INT_IF,required,wait=5,routefilter,nets=172.20.1.0/24
net COMB_IF optional,sourceroute=0,routefilter=0,arp_ignore=1,proxyarp=0,physical=$COMB_IF,upnp,nosmurfs,tcpflags
net COMC_IF optional,sourceroute=0,routefilter=0,arp_ignore=1,proxyarp=0,physical=$COMC_IF,upnp,nosmurfs,tcpflags,dhcp
@ -2506,9 +2509,14 @@ vpn TUN_IF+ physical=tun+,ignore=1
dmz br0 routeback,proxyarp=1
- lo ignore</programlisting>
<para><filename>/etc/shorewall/providers</filename>:</para>
<para><filename>/etc/shorewall/hosts:</filename></para>
<programlisting>#NAME NUMBER MARK DUPLICATE INTERFACE GATEWAY OPTIONS COPY
<programlisting>#ZONE HOST(S) OPTIONS
smc COMB_IF:10.1.10.0/24</programlisting>
<para><filename>/etc/shorewall/providers</filename>:</para>
<programlisting>#NAME NUMBER MARK DUPLICATE INTERFACE GATEWAY OPTIONS COPY
?if $FALLBACK
ComcastB 1 0x10000 - COMB_IF 70.90.191.126 loose,fallback
ComcastC 2 0x20000 - COMC_IF detect loose,fallback
@ -2519,17 +2527,17 @@ ComcastC 2 0x20000 - COMC_IF detect loose,lo
<emphasis role="bold">ComcastB 1 0x10000 - COMB_IF 70.90.191.126 loose,balance=2
ComcastC 2 0x20000 - COMC_IF detect loose,balance</emphasis>
?endif
?if $PROXY &amp;&amp; ! $SQUID
?if $PROXY &amp;&amp; ! $SQUID2
Squid 3 - - lo - tproxy
?endif
</programlisting>
<para>Notice that in the current balance mode, as in the STAISTICAL mode,
the business line is favored 2:1 over the consumer line.</para>
<para>Notice that in the current balance mode, as in the STATISTICAL
mode, the business line is favored 2:1 over the consumer line.</para>
<para>Here is <filename>/etc/shorewall/rtrules</filename>:</para>
<para>Here is <filename>/etc/shorewall/rtrules</filename>:</para>
<programlisting>#SOURCE DEST PROVIDER PRIORITY
<programlisting>#SOURCE DEST PROVIDER PRIORITY
70.90.191.121 - ComcastB 1000
70.90.191.123 - ComcastB 1000
&amp;COMC_IF - ComcastC 1000
@ -2537,28 +2545,28 @@ Squid 3 - - lo - tproxy
172.20.1.146 - ComcastC 1000
br0 - ComcastB 11000</programlisting>
<para>For reference, this configuration generates these routing
rules:</para>
<para>For reference, this configuration generates these routing
rules:</para>
<programlisting>root@gateway:~# ip rule ls
<programlisting>root@gateway:~# ip rule ls
0: from all lookup local
999: from all lookup main
1000: from 70.90.191.121 lookup Primary
1000: from 70.90.191.123 lookup Primary
1000: from 67.170.121.6 lookup Backup
1000: from 172.20.1.145 lookup Backup
1000: from 172.20.1.146 lookup Backup
10000: from all fwmark 0x10000/0x30000 lookup Primary
10001: from all fwmark 0x20000/0x30000 lookup Backup
11000: from all iif br0 lookup Primary
1000: from 70.90.191.121 lookup ComcastB
1000: from 70.90.191.123 lookup ComcastB
1000: from 67.170.121.6 lookup ComcastC
1000: from 172.20.1.145 lookup ComcastC
1000: from 172.20.1.146 lookup ComcastC
10000: from all fwmark 0x10000/0x30000 lookup ComcastB
10001: from all fwmark 0x20000/0x30000 lookup ComcastC
11000: from all iif br0 lookup ComcastB
32765: from all lookup balance
32767: from all lookup default
root@gateway:~# </programlisting>
<para><filename>/etc/shorewall/tcrules</filename> is not used to support
Multi-ISP:</para>
<para><filename>/etc/shorewall/tcrules</filename> is not used to support
Multi-ISP:</para>
<programlisting>#MARK SOURCE DEST PROTO DEST SOURCE
<programlisting>#MARK SOURCE DEST PROTO DEST SOURCE
# PORT(S) PORT(S)
FORMAT 2
TTL(+1):P INT_IF -
@ -2573,5 +2581,136 @@ SAME:P INT_IF - tcp 80,443
?endif
?endof
</programlisting>
</section>
<section>
<title>IPv6 Configuration</title>
<para>The IPv6 configuration has two separate sub-nets, both services
through 6in4 tunnels from <ulink
url="http://tunnelbroker.he.net">Hurricane Electric</ulink>. They are
both configured through the Business IPv4 uplink. I originally had the
sit2 tunnel configured through the consumer uplink but Comcast (Xfinity)
decided to start blocking HE IPv6 tunnels on their consumer network,
preferring their own 6to4 IPv6 solution.</para>
<para>One HE tunnel handles the servers and one tunnel handles the local
network.</para>
<para>Here are the key entries in
<filename>/etc/shorewall6/shorewall6.conf</filename>:</para>
<programlisting>###############################################################################
# F I R E W A L L O P T I O N S
###############################################################################
...
FASTACCEPT=No
FORWARD_CLEAR_MARK=Yes
IMPLICIT_CONTINUE=No
<emphasis role="bold">IP_FORWARDING=Keep</emphasis>
<emphasis role="bold">KEEP_RT_TABLES=Yes</emphasis> #Required when both IPv4 and IPv6 Multi-ISP are used
...
TRACK_PROVIDERS=No
<emphasis role="bold">USE_DEFAULT_RT=Yes</emphasis>
ZONE2ZONE=-
...
################################################################################
# P A C K E T M A R K L A Y O U T
################################################################################
TC_BITS=8
PROVIDER_BITS=8
PROVIDER_OFFSET=8
MASK_BITS=8
ZONE_BITS=0
</programlisting>
<para>Here is <filename>/etc/shorewall6/zones</filename>:</para>
<programlisting/>
<programlisting>#ZONE TYPE OPTIONS
fw firewall
net ipv6
loc ipv6
dmz ipv6</programlisting>
<para><filename>/etc/shorewall/interfaces</filename>:</para>
<programlisting>#ZONE INTERFACE OPTIONS
net sit1 forward=1,sfilter=2001:470:b:227::40/124,optional
net sit2 forward=1,sfilter=2001:470:b:227::40/124,optional
net sit3 forward=1,sfilter=2001:470:b:227::40/124,optional
loc eth2 forward=1
dmz br0 routeback,forward=1,required</programlisting>
<para><filename>/etc/shorewall/providers</filename>:</para>
<programlisting>#NAME NUMBER MARK DUPLICATE INTERFACE GATEWAY OPTIONS COPY
LOC 4 0x100 - sit2 - track,balance,loose
DMZ 5 0x200 - sit1 - track,fallback,loose
6to4 6 0x300 - sit3 ::192.88.99.1 track,fallback,loose</programlisting>
<para>Notice that the provider numbers are disjoint from those in the
IPv4 configuration. This allows for unique provider names in
<filename>/etc/iproute2/rt_tables</filename>:</para>
<programlisting>#
# reserved values
#
255 local
254 main
253 default
250 balance
0 unspec
#
# local
#
1 ComcastB
2 ComcastC
3 TProxy
4 LOC
5 DMZ
6 6to4</programlisting>
<para>The <filename>/etc/shorewall6/rtrules</filename> file is
straight-forward:</para>
<programlisting>#SOURCE DEST PROVIDER PRIORITY
2001:470:B:227::1/64 ::/0 DMZ 11000
2001:470:B:787::1/64 ::/0 LOC 11000
2002:465a:bf79::1/64 ::/0 6to4 11000</programlisting>
<para>This results in the following routing rules:</para>
<programlisting>root@gateway:~# <command>ip -6 rule ls</command>
0: from all lookup local
999: from all lookup main
10003: from all fwmark 0x100/0xff00 lookup LOC
10004: from all fwmark 0x200/0xff00 lookup DMZ
10005: from all fwmark 0x300/0xff00 lookup 6to4
11000: from 2001:470:b:787::1/64 lookup LOC
11000: from 2001:470:b:227::1/64 lookup DMZ
11000: from 2002:465a:bf79::1/64 lookup 6to4
32765: from all lookup balance
32767: from all lookup default
root@gateway:~# </programlisting>
</section>
</section>
</article>

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