Two or more network interfaces: Difference between revisions
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''Based on [https://www.thomas-krenn.com/en/wiki/Two_Default_Gateways_on_One_System the Thomas-Krenn-Wiki]'' | |||
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>. | 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>. | ||
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* Add | * Add | ||
<pre> | <pre> | ||
if /sbin/ip -4 route show | grep -wq "n.n.n.n/ | if /sbin/ip -4 route show | grep -wq "n.n.n.n/n dev ethX"; then | ||
/sbin/ip -4 route del n.n.n.n/ | /sbin/ip -4 route del n.n.n.n/n dev ethX | ||
fi | fi | ||
if ! /sbin/ip -4 route show table rt1 | grep -wq "n.n.n.n/ | if ! /sbin/ip -4 route show table rt1 | grep -wq "n.n.n.n/n dev ethX"; then | ||
/sbin/ip -4 route add n.n.n.n/ | /sbin/ip -4 route add n.n.n.n/n dev ethX scope link src a.a.a.a table rt1 | ||
fi | fi | ||
if ! /sbin/ip -4 route show table rt1 | grep -wq default; then | if ! /sbin/ip -4 route show table rt1 | grep -wq default; then | ||
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* Add | * Add | ||
<pre> | <pre> | ||
if /sbin/ip -4 route show table rt1 | grep -wq "n.n.n.n/ | if /sbin/ip -4 route show table rt1 | grep -wq "n.n.n.n/n dev ethX"; then | ||
/sbin/ip -4 route del n.n.n.n/ | /sbin/ip -4 route del n.n.n.n/n dev ethX table rt1 | ||
fi | fi | ||
if /sbin/ip -4 route show table rt1 | grep -wq default; then | if /sbin/ip -4 route show table rt1 | grep -wq default; then | ||
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to the end of IPv4 section of the function <code>gateway_down</code> in <code>/etc/rc.d/rc.inet1</code> | 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.inet1 restart | * <code># /etc/rc.d/rc.inet1 restart</code> | ||
[[Category: Linux]] | [[Category: Linux]] | ||
Latest revision as of 16:15, 13 December 2023
Based on the Thomas-Krenn-Wiki
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/n dev ethX"; then /sbin/ip -4 route del n.n.n.n/n dev ethX fi if ! /sbin/ip -4 route show table rt1 | grep -wq "n.n.n.n/n dev ethX"; then /sbin/ip -4 route add n.n.n.n/n 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/n dev ethX"; then /sbin/ip -4 route del n.n.n.n/n 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