Two or more network interfaces: Difference between revisions

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Bureaucrats, Interface administrators, Administrators
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Suppose that we have a system with already configured network interface <code>ethX</code> and we want to add an ip address <code>a.a.a.a</code> with gateway <code>g.g.g.g</code>.
Suppose that we have an additional network interface <code>ethX</code> with a network <code>n.n.n.n/n</code>, an ip address <code>a.a.a.a</code>, and a gateway <code>g.g.g.g</code>.
 
* Add the address with the subnet prefix length to <code>/etc/rc.d/rc.inet1.conf</code>:
<pre>
IPADDRS[X]="... a.a.a.a/aa"
</pre>


* Add a routing table to <code>/etc/iproute2/rt_tables</code>:
* Add a routing table to <code>/etc/iproute2/rt_tables</code>:
Line 19: Line 14:
#
#
#1      inr.ruhep
#1      inr.ruhep
2 rt2</pre>
1 rt1</pre>


* Add
* Add
<pre>
<pre>
if ! /sbin/ip -4 route show table rt2 | grep -wq default; then
if /sbin/ip -4 route show | grep -wq "n.n.n.n/29 dev ethX"; then
   debug_log "/sbin/ip -4 route add default via g.g.g.g table rt2"
   /sbin/ip -4 route del n.n.n.n/29 dev ethX
   /sbin/ip -4 route add default via g.g.g.g table rt2
fi
if ! /sbin/ip -4 route show table rt1 | grep -wq "n.n.n.n/29 dev ethX"; then
   /sbin/ip -4 route add n.n.n.n/29 dev ethX scope link src a.a.a.a table rt1
fi
fi
if ! /sbin/ip -4 rule show | grep "lookup rt2" 1> /dev/null ; then
if ! /sbin/ip -4 route show table rt1 | grep -wq default; then
   debug_log "/sbin/ip -4 rule add from a.a.a.a table rt2"
  /sbin/ip -4 route add default via g.g.g.g dev ethX table rt1
   /sbin/ip -4 rule add from a.a.a.a table rt2
fi
if ! /sbin/ip -4 rule show | grep -wq "lookup rt1"; then
   /sbin/ip -4 rule add from a.a.a.a/32 table rt2
   /sbin/ip -4 rule add to a.a.a.a/32 table rt2
fi
fi
</pre>
</pre>
Line 36: Line 36:
* Add
* Add
<pre>
<pre>
if /sbin/ip -4 route show table rt2 | grep -wq default; then
if /sbin/ip -4 route show table rt1 | grep -wq "n.n.n.n/29 dev ethX"; then
   debug_log "/sbin/ip -4 route del default table rt2"
   /sbin/ip -4 route del n.n.n.n/29 dev ethX table rt1
   /sbin/ip -4 route del default table rt2
fi
if /sbin/ip -4 route show table rt1 | grep -wq default; then
   /sbin/ip -4 route del default table rt1
fi
fi
if /sbin/ip -4 rule show | grep "lookup rt2" 1> /dev/null ; then
if /sbin/ip -4 rule show | grep -wq "lookup rt1"; then
   debug_log "/sbin/ip -4 rule del lookup rt2"
   /sbin/ip -4 rule del from a.a.a.a/32 table rt1
   /sbin/ip -4 rule del lookup rt2
   /sbin/ip -4 rule del to a.a.a.a/32 table rt1
fi
fi
</pre>
</pre>

Revision as of 01:09, 8 December 2023

Suppose that we have an additional network interface ethX with a network n.n.n.n/n, an ip address a.a.a.a, and a gateway g.g.g.g.

  • Add a routing table to /etc/iproute2/rt_tables:
#
# reserved values
#
255     local
254     main
253     default
0       unspec
#
# local
#
#1      inr.ruhep
1 rt1
  • Add
if /sbin/ip -4 route show | grep -wq "n.n.n.n/29 dev ethX"; then
  /sbin/ip -4 route del n.n.n.n/29 dev ethX
fi
if ! /sbin/ip -4 route show table rt1 | grep -wq "n.n.n.n/29 dev ethX"; then
  /sbin/ip -4 route add n.n.n.n/29 dev ethX scope link src a.a.a.a table rt1
fi
if ! /sbin/ip -4 route show table rt1 | grep -wq default; then
  /sbin/ip -4 route add default via g.g.g.g dev ethX table rt1
fi
if ! /sbin/ip -4 rule show | grep -wq "lookup rt1"; then
  /sbin/ip -4 rule add from a.a.a.a/32 table rt2
  /sbin/ip -4 rule add to a.a.a.a/32 table rt2
fi

to the end of IPv4 section of the function gateway_up in /etc/rc.d/rc.inet1

  • Add
if /sbin/ip -4 route show table rt1 | grep -wq "n.n.n.n/29 dev ethX"; then
  /sbin/ip -4 route del n.n.n.n/29 dev ethX table rt1
fi
if /sbin/ip -4 route show table rt1 | grep -wq default; then
  /sbin/ip -4 route del default table rt1
fi
if /sbin/ip -4 rule show | grep -wq "lookup rt1"; then
  /sbin/ip -4 rule del from a.a.a.a/32 table rt1
  /sbin/ip -4 rule del to a.a.a.a/32 table rt1
fi

to the end of IPv4 section of the function gateway_down in /etc/rc.d/rc.inet1

  • # /etc/rc.d/rc.inet1 restart
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