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log warning on very low MTU

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zzz
2014-07-05 17:01:29 +00:00
parent 4da7548caa
commit cc50d47376
1 changed files with 16 additions and 1 deletions
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17
router/java/src/net/i2p/router/transport/udp/MTU.java
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@ -6,6 +6,8 @@ import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
import net.i2p.I2PAppContext;
import net.i2p.util.Log;
import net.i2p.util.SystemVersion;
/**
@ -20,6 +22,12 @@ abstract class MTU {
/**
* The MTU for the socket interface, if available.
* Not available for Java 5.
*
* Note that we don't return the value for the default interface if
* we can't find the address. Finding the default interface is hard,
* altough we could perhaps just look for the first non-loopback address.
* But the MTU of the default route probably isn't relevant.
*
* @param ia null ok
* @return 0 if Java 5, or if not bound to an address;
* limited to range MIN_MTU to LARGE_MTU.
@ -43,7 +51,14 @@ abstract class MTU {
// testing
//return ifc.getMTU();
boolean isIPv6 = addr instanceof Inet6Address;
return rectify(isIPv6, ifc.getMTU());
int mtu = ifc.getMTU();
if ((isIPv6 && mtu < PeerState.MIN_IPV6_MTU) ||
(!isIPv6 && mtu < PeerState.MIN_MTU)) {
Log log = I2PAppContext.getGlobalContext().logManager().getLog(MTU.class);
log.logAlways(Log.WARN, "Unusually low MTU " + mtu + " for interface " + ia +
", consider disabling");
}
return rectify(isIPv6, mtu);
} catch (SocketException se) {
// ignore
} catch (Throwable t) {