Two or more network interfaces: Difference between revisions

Revision as of 12:56, 1 April 2023

Suppose that we have a system with already configured network interface and we want to add an ip address a.a.a.a with gateway g.g.g.g.

Add the address to /etc/rc.d/rc.inet1.conf:

IPADDRS[X]="... a.a.a.a/aa"

Add a routing table to /etc/iproute2/rt_tables:

#
# reserved values
#
255     local
254     main
253     default
0       unspec
#
# local
#
#1      inr.ruhep
2 rt2

Add

if ! /sbin/ip -4 route show table rt2 | grep -wq default; then
  debug_log "/sbin/ip -4 route add default via g.g.g.g table rt2"
  /sbin/ip -4 route add default via g.g.g.g table rt2
fi
if ! /sbin/ip -4 rule show | grep "lookup rt2" 1> /dev/null ; then
  debug_log "/sbin/ip -4 rule add from a.a.a.a table rt2"
  /sbin/ip -4 rule add from a.a.a.a 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 rt2 | grep -wq default; then
  debug_log "/sbin/ip -4 route del default table rt2"
  /sbin/ip -4 route del default table rt2
fi
if /sbin/ip -4 rule show | grep "lookup rt2" 1> /dev/null ; then
  debug_log "/sbin/ip -4 rule del lookup rt2"
  /sbin/ip -4 rule del lookup rt2
fi

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

# /etc/rc.d/rc.inet1 restart

@@ Line 1: / Line 1: @@
-''Based on [https://www.thomas-krenn.com/en/wiki/Two_Default_Gateways_on_One_System the Thomas-Krenn-Wiki]''
+Suppose that we have a system with already configured network interface 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 a system with already configured network interface <code>eth0</code> and we want to add another interface <code>eth1</code> with address <code>a.a.a.a</code> from network <code>n.n.n.n/22</code> and gateway <code>g.g.g.g</code>.
+* Add the address to <code>/etc/rc.d/rc.inet1.conf</code>:
+<pre>
-* Add <code>eth1</code> data to <code>/etc/rc.d/rc.inet1.conf</code>. Do not change the gateway.
+IPADDRS[X]="... a.a.a.a/aa"
+</pre>
 * Add a routing table to <code>/etc/iproute2/rt_tables</code>:
@@ Line 18: / Line 19: @@
 #
 #1      inr.ruhep
-rt1</pre>
+rt2</pre>
 * Add
 <pre>
-if ! /sbin/ip route list table rt1 | grep "^default via g.g.g.g dev eth1" 1> /dev/null ; then
+if ! /sbin/ip -4 route show table rt2 | grep -wq default; then
-   /sbin/ip route add n.n.n.n/22 dev eth1 proto kernel src a.a.a.a table rt1
+  debug_log "/sbin/ip -4 route add default via g.g.g.g table rt2"
-   /sbin/ip route add default via g.g.g.g dev eth1 metric 1 table rt1
+  /sbin/ip -4 route add default via g.g.g.g table rt2
-fi</pre>
+fi
-to the end of the function <code>gateway_up</code> in <code>/etc/rc.d/rc.inet1</code>
+if ! /sbin/ip -4 rule show | grep "lookup rt2" 1> /dev/null ; then
+   debug_log "/sbin/ip -4 rule add from a.a.a.a table rt2"
-* # /etc/rc.d/rc.inet1 restart
+   /sbin/ip -4 rule add from a.a.a.a table rt2
+fi
-* $ /sbin/ip route list table rt1
+</pre>
+to the end of IPv4 section of the function <code>gateway_up</code> in <code>/etc/rc.d/rc.inet1</code>
 * Add
 <pre>
-if ! /sbin/ip rule show | grep "a.a.a.a lookup rt1" 1> /dev/null ; then
+if /sbin/ip -4 route show table rt2 | grep -wq default; then
-   /sbin/ip rule add from a.a.a.a/32 table rt1
+   debug_log "/sbin/ip -4 route del default table rt2"
-   /sbin/ip rule add to a.a.a.a/32 table rt1
+   /sbin/ip -4 route del default table rt2
 fi
-</pre>to <code>/etc/rc.d/rc.firewall</code>
+if /sbin/ip -4 rule show | grep "lookup rt2" 1> /dev/null ; then
+  debug_log "/sbin/ip -4 rule del lookup rt2"
+  /sbin/ip -4 rule del lookup rt2
+fi
+</pre>
+to the end of IPv4 section of the function <code>gateway_down</code> in <code>/etc/rc.d/rc.inet1</code>
-* # /etc/rc.d/rc.firewall restart
+* # /etc/rc.d/rc.inet1 restart
-* $ /sbin/ip rule show
 [[Category: Linux]]

Two or more network interfaces: Difference between revisions

Revision as of 12:56, 1 April 2023

Navigation menu

Search